GE Industrial Solutions 40A Digital MegaDLynx User Manual

GE

Data Sheet

April 24, 2013

Features

 Compliant to RoHS EU Directive 2011/65/EU (Z versions)  Compliant to IPC-9592 (September 2008), Category 2, ClassII  Compatible in a Pb-free or SnPb reflow environment (Z

versions)

 Wide Input voltage range (4.5Vdc-14.4Vdc)  Output voltage programmable from 0.6Vdc to 2.0Vdc via

external resistor. Digitally adjustable down to 0.45Vdc

 Digital interface through the PMBus

TM #

protocol

 Tunable Loop

TM

to optimize dynamic output voltage

response

 Power Good signal  Fixed switching frequency with capability of external

synchronization

 Output overcurrent protection (non-latching)  Over temperature protection  Remote On/Off  Ability to sink and source current  Cost efficient open frame design  Small size: 33.02 mm x 13.46 mm x 10.9 mm

(1.3 in x 0.53 in x 0.429 in)

 Wide operating temperature range [-40°C to 105°C]  Ruggedized (-D) version able to withstand high levels of

shock and vibration

 UL* 60950-1 2

nd

Ed. Recognized, CSA† C22.2 No. 60950-1-

07 Certified, and VDE‡ (EN60950-1 2nd Ed.) Licensed

 ISO** 9001 and ISO 14001 certified manufacturing facilities

Applications

 Industrial equipment  Distributed power architectures  Intermediate bus voltage applications  Telecommunications equipment  Servers and storage applications  Networking equipment

Description

The 40A Digital Mega DLynxTM power modules are non-isolated dc-dc converters that can deliver up to 40A of output current. These modules operate over a wide range of input voltage (VIN = 4.5Vdc-14.4Vdc) and provide a precisely regulated output voltage from 0.45Vdc to 2.0Vdc, programmable via an external resistor and PMBus control. Features include a digital interface using the PMBus protocol, remote On/Off, adjustable output voltage, over current and over temperature protection. The PMBus interface supports a range of commands to both control and monitor the module. The module also includes the Tunable LoopTM feature that allows the user to optimize the dynamic response of the converter to match the load with reduced amount of output capacitance leading to savings on cost and PWB area.

* UL is a registered trademark of Underwriters Laboratories, Inc.

†

CSA is a registered trademark of Canadian Standards Association.

‡

VDE is a trademark of Verband Deutscher Elektrotechniker e.V.

** ISO is a registered trademark of the International Organization of Standards

#

The PMBus name and logo are registered trademarks of the System Management Interface Forum (SMIF)

TRIM

VOUT

VS+

GND

RTUNE

CTUNE

RTrim

VIN

Co

Cin

Vout+

Vin+

ON/OFF

SEQ

MODULE

PGOOD

SMBALRT#

SIG_GND

ADDR1

RADDR0

CLK

DATA

ADDR0

VS-

RADDR1

GND

SYNC

SHARE

RoHS Compliant

40A Digital MegaDLynxTM: Non-Isolated DC-DC Power Modules

4.5Vdc –14.4Vdc input; 0.45Vdc to 2.0Vdc output; 40A Output Current

GE

Data Sheet

40A Digital MegaDLynxTM: Non-Isolated DC-DC Power Modules

4.5Vdc –14.4Vdc input; 0.45Vdc to 2.0Vdc output; 40A Output Current

April 24, 2013

Page 2

Parameter

Device

Symbol

Min

Max

Unit

Input Voltage

All

V

IN

-0.3

15

V

Continuous

SEQ, SYNC, VS+

All

7

V

CLK, DATA, SMBALERT#

All

3.6

V

Operating Ambient Temperature

All

TA -40

105

°C

(see Thermal Considerations section)

Storage Temperature

All

T

stg

-55

125

°C

Parameter

Device

Symbol

Min

Typ

Max

Unit

Operating Input Voltage

All

VIN

4.5  14.4

Vdc

Maximum Input Current

All

I

IN,max

24

Adc

(VIN=4.5V to 14V, IO=I

O, max

)

Input No Load Current (VIN = 12Vdc, IO = 0, module enabled)

V

O,set

= 0.6 Vdc

I

IN,No load

54.7 mA

V

O,set

= 2Vdc

I

IN,No load

104 mA

Input Stand-by Current (VIN = 12Vdc, module disabled)

All

I

IN,stand-by

12.5 mA

Inrush Transient

All

I2t

1

A2s

Input Reflected Ripple Current, peak-to-peak

(5Hz to 20MHz, 1μH source impedance; VIN =0 to 14V, IO=

I

Omax

; See Test Configurations)

All

90 mAp-p Input Ripple Rejection (120Hz)

All

-60 dB

Absolute Maximum Ratings

Stresses in excess of the absolute maximum ratings can cause permanent damage to the device. These are absolute stress ratings only, functional operation of the device is not implied at these or any other conditions in excess of those given in the operations sections of the data sheet. Exposure to absolute maximum ratings for extended periods can adversely affect the device reliability.

Electrical Specifications

Unless otherwise indicated, specifications apply over all operating input voltage, resistive load, and temperature conditions.

GE

Data Sheet

40A Digital MegaDLynxTM: Non-Isolated DC-DC Power Modules

4.5Vdc –14.4Vdc input; 0.45Vdc to 2.0Vdc output; 40A Output Current

April 24, 2013

Page 3

Electrical Specifications (continued)

Parameter

Device

Symbol

Min

Typ

Max

Unit

Output Voltage Set-point (with 0.1% tolerance for external resistor used to set output voltage)

All

V

O, set

-1.0 +1.0

% V

O, set

Output Voltage (Over all operating input voltage, resistive load, and temperature conditions until end of life)

All

V

O, set

-3.0  +3.0

% V

O, set

Adjustment Range (selected by an external resistor) (Some output voltages may not be possible depending on the input voltage – see Feature Descriptions Section)

All

VO 0.6 2.0

Vdc

PMBus Adjustable Output Voltage Range

All

VO,adj

-25 0 +25

%V

O,set

PMBus Output Voltage Adjustment Step Size

All

0.4

%V

O,set

Remote Sense Range

All

0.5

Vdc

Output Regulation

Line (VIN=V

IN, min

to V

IN, max

)

All

 6

mV

Load (IO=I

O, min

to I

O, max

)

All

 10

mV

Temperature (T

ref=TA, min

to T

A, max

)

All

0.4 % V

O, set

Output Ripple and Noise on nominal output

(VIN=V

IN, nom

and IO=I

O, min

to I

O, max

Co = 0.1μF // 22 μF

ceramic capacitors)

Peak-to-Peak (5Hz to 20MHz bandwidth)

All

 50

100

mV

pk-pk

RMS (5Hz to 20MHz bandwidth)

All

20

38

mV

rms

External Capacitance1

Without the Tunable Loop

TM

ESR ≥ 1 mΩ

All

C

O, max

6x47  6x47

μF

With the Tunable Loop

TM

ESR ≥ 0.15 mΩ

All

C

O, max

6x47  7000

μF

ESR ≥ 10 mΩ

All

C

O, max

6x47  8500

μF

Output Current (in either sink or source mode)

All

Io 0 40

Adc

Output Current Limit Inception (Hiccup Mode) (current limit does not operate in sink mode)

All

I

O, lim

150

% I

o,max

Output Short-Circuit Current

All

I

O, s/c

2.1 Arms

(VO≤250mV) ( Hiccup Mode )

Efficiency

V

O,set

= 0.6Vdc

η 81.3 %

VIN= 12Vdc, TA=25°C

V

O, set

= 1.2Vdc

η 88.5 %

IO=I

O, max , VO

= V

O,set

V

O,set

= 1.8Vdc

η 91.5 %

Switching Frequency

All

f

sw



400  kHz

Frequency Synchronization

All

Synchronization Frequency Range

All 350 480

kHz

High-Level Input Voltage

All

VIH

2.0 V Low-Level Input Voltage

All

VIL

0.4

V

Input Current, SYNC

All

ISYNC

100

nA

Minimum Pulse Width, SYNC

All

tSYNC

100

ns

Maximum SYNC rise time

All

tSYNC_SH

100

ns

1

External capacitors may require using the new Tunable LoopTM feature to ensure that the module is stable as well as getting the best transient response. See the

Tunable LoopTM section for details.

GE

Data Sheet

40A Digital MegaDLynxTM: Non-Isolated DC-DC Power Modules

4.5Vdc –14.4Vdc input; 0.45Vdc to 2.0Vdc output; 40A Output Current

April 24, 2013

Page 4

Parameter

Device

Min

Typ

Max

Unit

Calculated MTBF (IO=0.8I

O, max

, TA=40°C) Telecordia Issue 2

Method 1 Case 3

All

6,498,4

38

Hours

Weight



11.7

(0.41)



g (oz.)

Parameter

Device

Symbol

Min

Typ

Max

Unit

On/Off Signal Interface

(VIN=V

IN, min

to V

IN, max

; open collector or equivalent,

Signal referenced to GND)

Device is with suffix “4” – Positive Logic (See Ordering Information)

Logic High (Module ON)

Input High Current

All

IIH  10

µA

Input High Voltage

All

VIH 3.5  V

IN,max

V

Logic Low (Module OFF)

Input Low Current

All

IIL



1

mA

Input Low Voltage

All

VIL -0.3  0.4

V

Device Code with no suffix – Negative Logic (See Ordering Information)

(On/OFF pin is open collector/drain logic input with

external pull-up resistor; signal referenced to GND)

Logic High (Module OFF)

Input High Current

All

IIH ― ― 1 mA

Input High Voltage

All

VIH 2 ―

V

IN, max

Vdc

Logic Low (Module ON)

Input low Current

All

IIL ― ―

10

μA

Input Low Voltage

All

VIL

-0.2 ― 0.4

Vdc

Turn-On Delay and Rise Times

(VIN=V

IN, nom

, IO=I

O, max , VO

to within ±1% of steady state)

Case 1: On/Off input is enabled and then input power is applied (delay from instant at which VIN = V

IN, min

until Vo =

10% of Vo, set)

All

Tdelay

―

1.1 ― msec

Case 2: Input power is applied for at least one second and then the On/Off input is enabled (delay from instant at which Von/Off is enabled until Vo = 10% of Vo, set)

All

Tdelay

―

700 ― μsec

Output voltage Rise time (time for Vo to rise from 10% of Vo, set to 90% of Vo, set)

All

Trise ―

1.5 ― msec

Output voltage overshoot (TA = 25oC VIN= V

IN, min

to V

IN, max,IO

= I

O, min

to I

O, max

)

With or without maximum external capacitance

3.0

% V

O, set

Output voltage overshoot (TA = 25oC VIN= V

IN, min

to V

IN, max,IO

= I

O, min

to I

O, max

)

With or without maximum external capacitance

3.0

% V

O, set

General Specifications

Feature Specifications

Unless otherwise indicated, specifications apply over all operating input voltage, resistive load, and temperature conditions. See Feature Descriptions for additional information.

GE

Data Sheet

40A Digital MegaDLynxTM: Non-Isolated DC-DC Power Modules

4.5Vdc –14.4Vdc input; 0.45Vdc to 2.0Vdc output; 40A Output Current

April 24, 2013

Page 5

Feature Specifications (cont.)

Parameter

Device

Symbol

Min

Typ

Max

Units

Over Temperature Protection (See Thermal Considerations section)

All

T

ref

145 °C

PMBus Over Temperature Warning Threshold*

All

T

WARN

130 °C

Tracking Accuracy (Power-Up: 0.5V/ms)

All

VSEQ –Vo

100

mV

(Power-Down: 0.5V/ms)

All

VSEQ –Vo

100

mV

(V

IN, min

to V

IN, max

; I

O, min

to I

O, max

VSEQ < Vo)

Input Undervoltage Lockout

Turn-on Threshold

All

4.25 Vdc

Turn-off Threshold

All

3.96 Vdc

Hysteresis

All

0.25 Vdc

PMBus Adjustable Input Under Voltage Lockout Thresholds

All

2.5 14

Vdc

Resolution of Adjustable Input Under Voltage Threshold

All

500

mV

PGOOD (Power Good)

Signal Interface Open Drain, V

supply

 5VDC

Overvoltage threshold for PGOOD ON

All

108 %V

O, set

Overvoltage threshold for PGOOD OFF

All

110 %V

O, set

Undervoltage threshold for PGOOD ON

All

92 %V

O, set

Undervoltage threshold for PGOOD OFF

All

90 %V

O, set

Pulldown resistance of PGOOD pin

All

50



Sink current capability into PGOOD pin

All

5

mA

* Over temperature Warning – Warning may not activate before alarm and unit may shutdown before warning.

GE

Data Sheet

40A Digital MegaDLynxTM: Non-Isolated DC-DC Power Modules

4.5Vdc –14.4Vdc input; 0.45Vdc to 2.0Vdc output; 40A Output Current

April 24, 2013

Page 6

Parameter

Conditions

Symbol

Min

Typ

Max

Unit

PMBus Signal Interface Characteristics

Input High Voltage (CLK, DATA)

VIH

2.1 3.6

V

Input Low Voltage (CLK, DATA)

VIL

0.8

V

Input high level current (CLK, DATA)

IIH

-10 10

μA

Input low level current (CLK, DATA)

IIL

-10 10

μA

Output Low Voltage (CLK, DATA, SMBALERT#)

I

OUT

=2mA

VOL

0.4

V

Output high level open drain leakage current (DATA, SMBALERT#)

V

OUT

=3.6V

I

OH

0 10

μA

Pin capacitance

CO 0.7 pF

PMBus Operating frequency range

Slave Mode

FPMB

10 400

kHz

Data hold time

Receive Mode

Transmit Mode

tHD:DAT

0

300

ns

Data setup time

tSU:DAT

250

ns

Measurement System Characteristics

Read delay time

tDLY

153

192

231

μs

Output current measurement range

I

RNG

0 40

A

Output current measurement resolution

IRES

62.5

mA

Output current measurement gain accuracy (at 25°C)

I

ACC

±5

%

Output current measurement offset

I

OFST

0.1

A

V

OUT

measurement range

V

OUT(rng)

0 2.0

V

OUT

measurement resolution

V

OUT(res)

16.25 mV

V

OUT

measurement gain accuracy

V

OUT(gain)

-2 2

LSB

V

OUT

measurement offset

V

OUT(ofst)

-3 3

LSB

V

OUT

measurement accuracy

70 mV

VIN measurement range

V

IN(rng)

0 14.4

V

VIN measurement resolution

V

IN(res)

32.5 mV

VIN measurement gain accuracy

V

IN(gain)

-2 2

LSB

VIN measurement offset

V

IN(ofst)

-5.5 1.4

%

VIN measurement accuracy

VIN

±3 %

Digital Interface Specifications

Unless otherwise indicated, specifications apply over all operating input voltage, resistive load, and temperature conditions. See Feature Descriptions for additional information.

GE

Data Sheet

40A Digital MegaDLynxTM: Non-Isolated DC-DC Power Modules

4.5Vdc –14.4Vdc input; 0.45Vdc to 2.0Vdc output; 40A Output Current

April 24, 2013

Page 7

EFFICIENCY,  (%)

OUTPUT CURRENT, Io (A)

OUTPUT CURRENT, IO (A)

AMBIENT TEMPERATURE, TA OC

Figure 1. Converter Efficiency versus Output Current.

Figure 2. Derating Output Current versus Ambient Temperature and Airflow.

OUTPUT VOLTAGE

V

O

(V) (10mV/div)

OUTPUT CURRENT, OUTPUT VOLTAGE

I

O

(A) (20A/div) V

O

(V) (20mV/div)

TIME, t (1s/div)

TIME, t (20s /div)

Figure 3. Typical output ripple and noise (CO=6x47uF ceramic, VIN = 12V, Io = Io,max, ).

Figure 4. Transient Response to Dynamic Load Change from 50% to 100% at 12Vin, Cout= 12x680uF+6x47uF, CTune=47nF, RTune=180 ohms

OUTPUT VOLTAGE ON/OFF VOLTAGE

V

O

(V) (200mV/div) V

ON/OFF

(V) (5V/div)

OUTPUT VOLTAGE INPUT VOLTAGE

V

O

(V) (200mV/div) V

IN

(V) (5V/div)

TIME, t (1ms/div)

Figure 5. Typical Start-up Using On/Off Voltage (Io = Io,max).

Figure 6. Typical Start-up Using Input Voltage (VIN = 12V, Io = Io,max).

70

75

80

85

90

0 10 20 30 40

Vin=14V

Vin=12V

Vin=4.5V

15

20

25

30

35

40

45

45 55 65 75 85 95 105

2m/s

(400LFM)

1.5m/s

(300LFM)

0.5m/s

(100LFM)

NC

Ruggedized (D)

Part (105 C)

Standard Part

(85 C)

1m/s

(200LFM)

Characteristic Curves

The following figures provide typical characteristics for the 40A Digital Mega DLynxTM at 0.6Vo and 25oC.

GE

Data Sheet

40A Digital MegaDLynxTM: Non-Isolated DC-DC Power Modules

4.5Vdc –14.4Vdc input; 0.45Vdc to 2.0Vdc output; 40A Output Current

April 24, 2013

Page 8

EFFICIENCY,  (%)

OUTPUT CURRENT, Io (A)

OUTPUT CURRENT, IO (A)

AMBIENT TEMPERATURE, TA OC

Figure 7. Converter Efficiency versus Output Current.

Figure 8. Derating Output Current versus Ambient Temperature and Airflow.

OUTPUT VOLTAGE

V

O

(V) (10mV/div)

OUTPUT CURRENT, OUTPUT VOLTAGE

I

O

(A) (20A/div) V

O

(V) (20mV/div)

TIME, t (1s/div)

TIME, t (20s /div)

Figure 9. Typical output ripple and noise (CO= 6x47uF ceramic, VIN = 12V, Io = Io,max, ).

Figure 10. Transient Response to Dynamic Load Change from 50% to 100% at 12Vin, Cout= 6x330uF, CTune=12nF & RTune=200 ohms

OUTPUT VOLTAGE ON/OFF VOLTAGE

V

O

(V) (500mV/div) V

ON/OFF

(V) (5V/div)

OUTPUT VOLTAGE INPUT VOLTAGE

V

O

(V) (500mV/div) V

IN

(V) (5V/div)

TIME, t (1ms/div)

Figure 11. Typical Start-up Using On/Off Voltage (Io = Io,max).

Figure 12. Typical Start-up Using Input Voltage (VIN = 12V, Io = Io,max).

70

75

80

85

90

95

0 10 20 30 40

Vin=14.4V

Vin=12V

Vin=4.5V

10

15

20

25

30

35

40

45

45 55 65 75 85 95 105

2m/s

(400LFM)

1.5m/s

(300LFM)

1m/s

(200LFM)

0.5m/s

(100LFM)

NC

Standard Part

(85 C)

Ruggedized (D)

Part (105 C)

Characteristic Curves

The following figures provide typical characteristics for the 40A Digital Mega DLynxTM at 1.2Vo and 25oC.

GE

Data Sheet

40A Digital MegaDLynxTM: Non-Isolated DC-DC Power Modules

4.5Vdc –14.4Vdc input; 0.45Vdc to 2.0Vdc output; 40A Output Current

April 24, 2013

Page 9

EFFICIENCY,  (%)

OUTPUT CURRENT, Io (A)

OUTPUT CURRENT, IO (A)

AMBIENT TEMPERATURE, TA OC

Figure 13. Converter Efficiency versus Output Current.

Figure 14. Derating Output Current versus Ambient Temperature and Airflow.

OUTPUT VOLTAGE

V

O

(V) (20mV/div)

OUTPUT CURRENT, OUTPUT VOLTAGE

I

O

(A) (20A/div) V

O

(V) (20mV/div)

TIME, t (1s/div)

TIME, t (20s /div)

Figure 15. Typical output ripple and noise (CO=6x47uF ceramic, VIN = 12V, Io = Io,max, ).

Figure 16. Transient Response to Dynamic Load Change from 50% to 100% at 12Vin, Cout= 6x330uF, CTune=5.6nF & RTune=220 ohms

OUTPUT VOLTAGE ON/OFF VOLTAGE

V

O

(V) (500mV/div) V

ON/OFF

(V) (5V/div)

OUTPUT VOLTAGE INPUT VOLTAGE

V

O

(V) (500mV/div) V

IN

(V) (5V/div)

TIME, t (1ms/div)

Figure 17. Typical Start-up Using On/Off Voltage (Io = Io,max).

Figure 18. Typical Start-up Using Input Voltage (VIN = 12V, Io = Io,max).

70

75

80

85

90

95

100

Vin=14.4V

Vin=12V

Vin=4.5V

5

10

15

20

25

30

35

40

45

45 55 65 75 85 95 105

2m/s

(400LFM)

1.5m/s

1m/s

(200LFM)

0.5m/s

(100LFM)

NC

Standard Part

(85 C)

Ruggedized (D)

Part (105 C)

Characteristic Curves

The following figures provide typical characteristics for the 40A Digital Mega DLynxTM at 1.8Vo and 25oC.

GE

Data Sheet

40A Digital MegaDLynxTM: Non-Isolated DC-DC Power Modules

4.5Vdc –14.4Vdc input; 0.45Vdc to 2.0Vdc output; 40A Output Current

April 24, 2013

Page 10

50

100

150

200

250

300

350

400

0.6 0.8 1 1.2 1.4 1.6 1.8 2

Ripple Voltage (mVpk-pk)

Output Voltage (Volts)

4x22uF Ext Cap 6x22uF Ext Cap 8x22uF Ext Cap

0

10

20

30

40

0.6 0.8 1 1.2 1.4 1.6 1.8 2

Ripple (mVp-p)

Output Voltage(Volts)

6x47uF Ext Cap 8x47uF Ext Cap 10x47uF Ext Cap

Design Considerations

Input Filtering

The 40A Digital Mega DLynxTM module should be connected to a low ac-impedance source. A highly inductive source can affect the stability of the module. An input capacitance must be placed directly adjacent to the input pin of the module, to minimize input ripple voltage and ensure module stability.

To minimize input voltage ripple, ceramic capacitors are recommended at the input of the module. Figure 19 shows the input ripple voltage for various output voltages at 40A of load current with 4x22 µF, 6x22µF or 8x22uF ceramic capacitors and an input of 12V.

Figure 19. Input ripple voltage for various output voltages with various external ceramic capacitors at the input (40A load). Input voltage is 12V. Scope Bandwidth limited to 20MHz

Output Filtering

These modules are designed for low output ripple voltage and will meet the maximum output ripple specification with

0.1 µF ceramic and 47 µF ceramic capacitors at the output of the module. However, additional output filtering may be required by the system designer for a number of reasons. First, there may be a need to further reduce the output ripple and noise of the module. Second, the dynamic response characteristics may need to be customized to a particular load step change.

To reduce the output ripple and improve the dynamic response to a step load change, additional capacitance at the output can be used. Low ESR polymer and ceramic capacitors are recommended to improve the dynamic response of the module. Figure 20 provides output ripple information for different external capacitance values at various Vo and a full load current of 40A. For stable operation of the module, limit the capacitance to less than the maximum output capacitance as specified in the electrical specification table. Optimal performance of the module can be achieved by using the Tunable LoopTM feature described later in this data sheet.

Figure 20. Output ripple voltage for various output voltages with external 6x47 µF, 8x47 µF or 10x47 µF ceramic capacitors at the output (40A load). Input voltage is 12V. Scope Bandwidth limited to 20MHz

Safety Considerations

For safety agency approval the power module must be installed in compliance with the spacing and separation requirements of the end-use safety agency standards, i.e., UL 60950-1 2nd, CSA C22.2 No. 60950-1-07, DIN EN 609501:2006 + A11 (VDE0805 Teil 1 + A11):2009-11; EN 609501:2006 + A11:2009-03.

For the converter output to be considered meeting the requirements of safety extra-low voltage (SELV), the input must meet SELV requirements. The power module has extra-low voltage (ELV) outputs when all inputs are ELV. The input to these units is to be provided with a fast acting fuse with a maximum rating of 30A, 100V (for example, Littlefuse

456 series) in the positive input lead.

GE

Data Sheet

40A Digital MegaDLynxTM: Non-Isolated DC-DC Power Modules

4.5Vdc –14.4Vdc input; 0.45Vdc to 2.0Vdc output; 40A Output Current

April 24, 2013

Page 11

Analog Feature Descriptions

MODULE

Internal Pullup

ON/OFF

I

10K

PWM Enable

470

ON/OFF

Q1

GND

VIN+

ON/OFF

10K

Rpullup

CR1

+

_

V

PWM Enable

VIN+

Internal Pullup

22K

_

ON/OFF

V

Rpullup

ON/OFF

MODULE

Q1

+

Q3

10K

I

470

GND

10K

22K

ON/OFF

Remote On/Off

The module can be turned ON and OFF either by using the ON/OFF pin (Analog interface) or through the PMBus interface (Digital). The module can be configured in a number of ways through the PMBus interface to react to the two ON/OFF inputs:

 Module ON/OFF can be controlled only through the analog interface (digital interface ON/OFF commands are ignored)  Module ON/OFF can be controlled only through the PMBus interface (analog interface is ignored)  Module ON/OFF can be controlled by either the analog or digital interface

The default state of the module (as shipped from the factory) is to be controlled by the analog interface only. If the digital interface is to be enabled, or the module is to be controlled only through the digital interface, this change must be made through the PMBus. These changes can be made and written to non-volatile memory on the module so that it is remembered for subsequent use.

Analog On/Off

The 40A Digital Mega DLynxTM power modules feature an On/Off pin for remote On/Off operation. Two On/Off logic options are available. In the Positive Logic On/Off option, (device code suffix “4” – see Ordering Information), the module turns ON during a logic High on the On/Off pin and turns OFF during a logic Low. With the Negative Logic On/Off option, (no device code suffix, see Ordering Information), the module turns OFF during logic High and ON during logic Low. The On/Off signal should be always referenced to ground. For either On/Off logic option, leaving the On/Off pin disconnected will turn the module ON when input voltage is present.

For positive logic modules, the circuit configuration for using the On/Off pin is shown in Figure 21.

For negative logic On/Off modules, the circuit configuration is shown in Fig. 22..

Figure 22. Circuit configuration for using negative On/Off logic.

Digital On/Off

Please see the Digital Feature Descriptions section.

Monotonic Start-up and Shutdown

The module has monotonic start-up and shutdown behavior for any combination of rated input voltage, output current and operating temperature range.

Startup into Pre-biased Output

The module can start into a prebiased output as long as the prebias voltage is 0.5V less than the set output voltage.

Analog Output Voltage Programming

The output voltage of the module is programmable to any voltage from 0.6dc to 2.0Vdc by connecting a resistor between the Trim and SIG_GND pins of the module. Certain restrictions apply on the output voltage set point depending on the input voltage. These are shown in the Output Voltage vs. Input Voltage Set Point Area plot in Fig. 23. The Upper Limit curve shows that for output voltages lower than 1V, the input voltage must be lower than the maximum of

14.4V. The Lower Limit curve shows that for output voltages higher than 0.6V, the input voltage needs to be larger than the minimum of 4.5V.

Figure 21. Circuit configuration for using positive On/Off logic.

GE

Data Sheet

40A Digital MegaDLynxTM: Non-Isolated DC-DC Power Modules

4.5Vdc –14.4Vdc input; 0.45Vdc to 2.0Vdc output; 40A Output Current

April 24, 2013

Page 12

V

O

(+)

TRIM

VS─

R

trim

LOAD

V

IN

(+)

ON/OFF

VS+

SIG_GND

 



 



 





 k

Vo

Rtrim

6.0

12

V

O, set

(V)

Rtrim (KΩ)

0.6

Open

0.9

40

1.0

30

1.2

20

1.5

13.33

1.8

10

Vo

MODULE

SIG_GND

Trim

Q1

Rtrim

Rmargin-up

Q2

Rmargin-down

Figure 23. Output Voltage vs. Input Voltage Set Point Area plot showing limits where the output voltage can be set for different input voltages.

Digital Output Voltage Adjustment

Please see the Digital Feature Descriptions section.

Remote Sense

The power module has a Remote Sense feature to minimize the effects of distribution losses by regulating the voltage between the sense pins (VS+ and VS-). The voltage drop between the sense pins and the VOUT and GND pins of the module should not exceed 0.5V.

Analog Voltage Margining

Output voltage margining can be implemented in the module by connecting a resistor, R to the ground pin for margining-up the output voltage and by connecting a resistor, R

margin-down

output pin for margining-down. Figure 25 shows the circuit configuration for output voltage margining. The POL Programming Tool, available at www.lineagepower.com under the Downloads section, also calculates the values of R

margin-up

and R

margin-down

for a specific output voltage and % margin. Please consult your local GE technical representative for additional details.

, from the Trim pin

margin-up

, from the Trim pin to

Caution – Do not connect SIG_GND to GND elsewhere in the layout

Figure 24. Circuit configuration for programming output voltage using an external resistor.

Without an external resistor between Trim and SIG_GND pins, the output of the module will be 0.6Vdc.To calculate the value of the trim resistor, Rtrim for a desired output voltage, should be as per the following equation:

Rtrim is the external resistor in kΩ

Vo is the desired output voltage.

Table 1 provides Rtrim values required for some common output voltages.

Table 1

Figure 25. Circuit Configuration for margining Output voltage.

Digital Output Voltage Margining

Please see the Digital Feature Descriptions section.

Output Voltage Sequencing

The power module includes a sequencing feature, EZSEQUENCE that enables users to implement various types of output voltage sequencing in their applications. This is accomplished via an additional sequencing pin. When not using the sequencing feature, leave it unconnected.

The voltage applied to the SEQ pin should be scaled down by the same ratio as used to scale the output voltage down to the reference voltage of the module. This is accomplished by an external resistive divider connected across the sequencing voltage before it is fed to the SEQ pin as shown in Fig. 26. In addition, a small capacitor (suggested value 100pF) should be connected across the lower resistor R1.

For all DLynx modules, the minimum recommended delay between the ON/OFF signal and the sequencing signal is

GE

Data Sheet

40A Digital MegaDLynxTM: Non-Isolated DC-DC Power Modules

4.5Vdc –14.4Vdc input; 0.45Vdc to 2.0Vdc output; 40A Output Current

April 24, 2013

Page 13

10ms to ensure that the module output is ramped up

MODULE

SYNC

GND

+

─

100 pF

DLynx Module

R1=Rtrim

20K

SIG_GND

SEQ

V

according to the sequencing signal. This ensures that the module soft-start routine is completed before the sequencing signal is allowed to ramp up.

Figure 26. Circuit showing connection of the sequencing signal to the SEQ pin.

When the scaled down sequencing voltage is applied to the SEQ pin, the output voltage tracks this voltage until the output reaches the set-point voltage. The final value of the sequencing voltage must be set higher than the set-point voltage of the module. The output voltage follows the sequencing voltage on a one-to-one basis. By connecting multiple modules together, multiple modules can track their output voltages to the voltage applied on the SEQ pin.

The module’s output can track the SEQ pin signal with slopes

of up to 0.5V/msec during power-up or power-down. To initiate simultaneous shutdown of the modules, the SEQ

pin voltage is lowered in a controlled manner. The output voltage of the modules tracks the voltages below their setpoint voltages on a one-to-one basis. A valid input voltage must be maintained until the tracking and output voltages reach ground potential.

Note that in all digital DLynx series of modules, the PMBus Output Undervoltage Fault will be tripped when sequencing is employed. This will be detected using the STATUS_WORD and STATUS_VOUT PMBus commands. In addition, the SMBALERT# signal will be asserted low as occurs for all faults and warnings. To avoid the module shutting down due to the Output Undervoltage Fault, the module must be set to continue operation without interruption as the response to this fault (see the description of the PMBus command VOUT_UV_FAULT_RESPONSE for additional information).

Overtemperature Protection

To provide protection in a fault condition, the unit is equipped with a thermal shutdown circuit. The unit will shut down if the over temperature threshold of 145ºC(typ) is exceeded at the thermal reference point T shutdown it will then wait to cool before attempting to restart.

.Once the unit goes into thermal

ref

Digital Temperature Status via PMBus

Please see the Digital Feature Descriptions section.

Digitally Adjustable Output Over and Under Voltage Protection

Please see the Digital Feature Descriptions section.

Input Undervoltage Lockout

At input voltages below the input undervoltage lockout limit, the module operation is disabled. The module will begin to operate at an input voltage above the undervoltage lockout turn-on threshold.

Digitally Adjustable Input Undervoltage Lockout

Please see the Digital Feature Descriptions section.

Digitally Adjustable Power Good Thresholds

Please see the Digital Feature Descriptions section.

Synchronization

The module switching frequency can be synchronized to a signal with an external frequency within a specified range. Synchronization can be done by using the external signal applied to the SYNC pin of the module as shown in Fig. 27, with the converter being synchronized by the rising edge of the external signal. The Electrical Specifications table specifies the requirements of the external SYNC signal. If the SYNC pin is not used, the module should free run at the default switching frequency. If synchronization is not being

used, connect the SYNC pin to GND.

Overcurrent Protection

To provide protection in a fault (output overload) condition, the unit is equipped with internal current-limiting circuitry and can endure current limiting continuously. At the point of current-limit inception, the unit enters hiccup mode. The unit operates normally once the output current is brought back into its specified range.

Figure 27. External source connections to synchronize switching frequency of the module.

Digital Adjustable Overcurrent Warning

Please see the Digital Feature Descriptions section.

GE

Data Sheet

40A Digital MegaDLynxTM: Non-Isolated DC-DC Power Modules

4.5Vdc –14.4Vdc input; 0.45Vdc to 2.0Vdc output; 40A Output Current

April 24, 2013

Page 14

Paralleling with Active Load Sharing (-P Option)

For additional power requirements, the Mega DLynxTM power module is also equipped with paralleling capability. Up to five modules can be configured in parallel, with active load sharing.

To implement paralleling, the following conditions must be satisfied.

 All modules connected in parallel must be frequency

synchronized where they are switching at the same frequency. This is done by using the SYNC function of the module and connecting to an external frequency source. Modules can be interleaved to reduce input ripple/filtering requirements.

 The share pins of all units in parallel must be connected

together. The path of these connections should be as direct as possible.

 The remote sense connections to all modules should be

made that to same points for the output, i.e. all VS+ and VS- terminals for all modules are connected to the power bus at the same points.

Some special considerations apply for design of converters in parallel operation:

 When sizing the number of modules required for

parallel operation, take note of the fact that current sharing has some tolerance. In addition, under transient conditions such as a dynamic load change and during startup, all converter output currents will not be equal. To allow for such variation and avoid the likelihood of a converter shutting off due to a current overload, the total capacity of the paralleled system should be no more than 90% of the sum of the individual converters. As an example, for a system of three MegaDLynxTM converters in parallel, the total current drawn should be less that 90% of (3 x 40A), i.e. less than 108 A. Similarly, four units can support a load less than 144 A.

 All modules should be turned ON and OFF together. This

is so that all modules come up at the same time avoiding the problem of one converter sourcing current into the other leading to an overcurrent trip condition. To ensure that all modules come up simultaneously, the on/off pins of all paralleled converters should be tied together and the converters enabled and disabled using the on/off pin. Note that this means that converters in parallel cannot be digitally turned ON as that does not ensure that all modules being paralleled turn on at the same time.

 If digital trimming is used to adjust the overall output

voltage, the adjustments need to be made in a series of small steps to avoid shutting down the output. Each step should be no more than 20mV for each module. For example, to adjust the overall output voltage in a setup with two modules (A and B) in parallel from 1V to

1.1V, module A would be adjusted from 1.0 to 1.02V followed by module B from 1.0 to 1.02V, then each module in sequence from 1.02 to 1.04V and so on until the final output voltage of 1.1V is reached.

 If the Sequencing function is being used to start-up and

shut down modules and the module is being held to 0V by the tracking signal then there may be small deviations on the module output. This is due to controller duty cycle limitations encountered in trying to hold the voltage down near 0V.

 The share bus is not designed for redundant operation

and the system will be non-functional upon failure of one of the units when multiple units are in parallel. In particular, if one of the converters shuts down during operation, the other converters may also shut down due to their outputs hitting current limit. In such a situation, unless a coordinated restart is ensured, the system may never properly restart since different converters will try to restart at different times causing an overload condition and subsequent shutdown. This situation can be avoided by having an external output voltage monitor circuit that detects a shutdown condition and forces all converters to shut down and restart together.

When not using the active load share feature, share pins should be left unconnected.

Measuring Output Current, Output Voltage and Input Voltage

Please see the Digital Feature Descriptions section.

Dual Layout

Identical dimensions and pin layout of Analog and Digital Mega DLynx modules permit migration from one to the other without needing to change the layout. In both cases the trim resistor is connected between trim and signal ground.

GE

Data Sheet

40A Digital MegaDLynxTM: Non-Isolated DC-DC Power Modules

4.5Vdc –14.4Vdc input; 0.45Vdc to 2.0Vdc output; 40A Output Current

April 24, 2013

Page 15

Tunable Loop

CO 6x

47µF

8x

47µF

10x

47µF

12x

47µF

20x

47µF

R

TUNE

330Ω

200Ω

C

TUNE

330pF

820pF

1200pF

1500pF

3300pF

VO 1.8V

1.2V

0.6V

C

O

4x47uF +

6x330µF

polymer

4x47uF +

11x330µF

polymer

4x47uF +

12x680µF

polymer

R

TUNE

220 Ω

200 Ω

180 Ω

C

TUNE

5600pF

12nF

47nF

∆V

34mV

22mV

12mV

VS+

MODULE

SIG_GND

TRIM

VOUT

RTune

CTune

RTrim

CO

GND

TM

The module has a feature that optimizes transient response of the module called Tunable LoopTM.

External capacitors are usually added to the output of the module for two reasons: to reduce output ripple and noise (see Figure 38) and to reduce output voltage deviations from the steady-state value in the presence of dynamic load current changes. Adding external capacitance however affects the voltage control loop of the module, typically causing the loop to slow down with sluggish response. Larger values of external capacitance could also cause the module to become unstable.

The Tunable LoopTM allows the user to externally adjust the voltage control loop to match the filter network connected to the output of the module. The Tunable LoopTM is implemented by connecting a series R-C between the VS+ and TRIM pins of the module, as shown in Fig. 28. This R-C allows the user to externally adjust the voltage loop feedback compensation of the module.

Table 2. General recommended values of of R C

for Vin=12V and various external ceramic capacitor

TUNE

combination

Table 3. Recommended values of R

TUNE

and C

TUNE

transient deviation of 2% of Vout for a 20A step load with Vin=12V.

Note: The capacitors used in the Tunable Loop tables are 47 μF/3 mΩ ESR ceramic, 330 μF/12 mΩ ESR polymer capacitor and 680μF/12 mΩ polymer capacitor.

and

to obtain

Figure. 28. Circuit diagram showing connection of R and C

Recommended values of R capacitor combinations are given in Table 2. Table 2 shows the recommended values of R values of ceramic output capacitors up to 1000uF that might be needed for an application to meet output ripple and noise requirements. Selecting R will ensure stable operation of the module. In applications with tight output voltage limits in the presence of dynamic current loading, additional output capacitance will be required. Table 3 lists recommended values of R and C for some common output voltages in the presence of a 20A to 40A step change (50% of full load), with an input voltage of 12V.

Please contact your GE technical representative to obtain more details of this feature as well as for guidelines on how to select the right value of external R-C to tune the module for best transient performance and stable operation for other output capacitance values.

to tune the control loop of the module.

TUNE

and C

TUNE

and C

TUNE

in order to meet 2% output voltage deviation limits

TUNE

for different output

TUNE

and C

TUNE

for different

TUNE

according to Table 2

TUNE

GE

Data Sheet

40A Digital MegaDLynxTM: Non-Isolated DC-DC Power Modules

4.5Vdc –14.4Vdc input; 0.45Vdc to 2.0Vdc output; 40A Output Current

April 24, 2013

Page 16

Data Byte High

7 6 5 4 3 2 1 0 7 6 5 4 3 2 1

0

Data Byte Low

Exponent

MSB

Mantissa

MSB

Digit

Resistor Value (KΩ)

0

10 1 15.4 2 23.7 3 36.5 4 54.9 5 84.5 6 130 7 200

ADDR0

SIG_GND

R

ADDR0

R

ADDR1

Bit Position

4 3 2 1 0

Access

r/w

r/w r Function

PU

CMD

CPR

POL

CPA

Default Value

1 0 1 1 1

Digital Feature Descriptions

PMBus Interface Capability

The 40A Digital Mega DLynxTM power modules have a PMBus interface that supports both communication and control. The PMBus Power Management Protocol Specification can be obtained from www.pmbus.org. The modules support a subset of version 1.1 of the specification (see Table 6 for a list of the specific commands supported). Most module parameters can be programmed using PMBus and stored as defaults for later use.

All communication over the module PMBus interface must support the Packet Error Checking (PEC) scheme. The PMBus master must generate the correct PEC byte for all transactions, and check the PEC byte returned by the module.

The module also supports the SMBALERT# response protocol whereby the module can alert the bus master if it wants to talk. For more information on the SMBus alert response protocol, see the System Management Bus (SMBus) specification.

The module has non-volatile memory that is used to store configuration settings. Not all settings programmed into the device are automatically saved into this non-volatile memory, only those specifically identified as capable of being stored can be saved (see Table 6 for which command parameters can be saved to non-volatile storage).

address resistor value is outside the range specified in Table 4, the module will respond to address 127.

Table 4

The user must know which I2C addresses are reserved in a system for special functions and set the address of the module to avoid interfering with other system operations. Both 100kHz and 400kHz bus speeds are supported by the module. Connection for the PMBus interface should follow the High Power DC specifications given in section 3.1.3 in the SMBus specification V2.0 for the 400kHz bus speed or the Low Power DC specifications in section 3.1.2. The complete SMBus specification is available from the SMBus web site,

smbus.org.

PMBus Data Format

For commands that set thresholds, voltages or report such

quantities, the module supports the “Linear” data format

among the three data formats supported by PMBus. The Linear Data Format is a two byte value with an 11-bit, two’s complement mantissa and a 5-bit, two’s complement exponent. The format of the two data bytes is shown below:

The value is of the number is then given by

Value = Mantissa x 2

Exponent

PMBus Addressing

The power module can be addressed through the PMBus using a device address. The module has 64 possible addresses (0 to 63 in decimal) which can be set using resistors connected from the ADDR0 and ADDR1 pins to SIG_GND. Note that some of these addresses (0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 12, 40, 44, 45, 55 in decimal) are reserved according to the SMBus specifications and may not be useable. The address is set in the form of two octal (0 to 7) digits, with each pin setting one digit. The ADDR1 pin sets the high order digit and ADDR0 sets the low order digit. The resistor values suggested for each digit are shown in Table 4 (1% tolerance resistors are recommended). Note that if either

Figure 29. Circuit showing connection of resistors used to set the PMBus address of the module.

PMBus Enabled On/Off

The module can also be turned on and off via the PMBus interface. The OPERATION command is used to actually turn the module on and off via the PMBus, while the ON_OFF_CONFIG command configures the combination of analog ON/OFF pin input and PMBus commands needed to turn the module on and off. Bit [7] in the OPERATION command data byte enables the module, with the following functions:

0 : Output is disabled 1 : Output is enabled

This module uses the lower five bits of the ON_OFF_CONFIG data byte to set various ON/OFF options as follows:

GE

Data Sheet

40A Digital MegaDLynxTM: Non-Isolated DC-DC Power Modules

4.5Vdc –14.4Vdc input; 0.45Vdc to 2.0Vdc output; 40A Output Current

April 24, 2013

Page 17

PU: Sets the default to either operate any time input power is

Bit Value

Action

0

1

Bit Value

Action

0

1

Bit Value

Action

0 1

Rise Time

Exponent

Mantissa

600μs

11100

00000001010

900μs

11100

00000001110

1.2ms

11100

00000010011

1.8ms

11100

00000011101

2.7ms

11100

00000101011

4.2ms

11100

00001000011

6.0ms

11100

00001100000

9.0ms

11100

00010010000

REFOUT

V

RTrim

V 

 



 







20000

RTrim

LOOPSCALEVOUT





20000

__

10

)(

2_



 TRIMVOUTV

offsetOUT

present or for the ON/OFF to be controlled by the analog ON/OFF input and the PMBus OPERATION command. This bit is used together with the CP, CMD and ON bits to determine startup.

CMD: The CMD bit controls how the device responds to the OPERATION command.

Output Voltage Adjustment Using the PMBus

The VOUT_SCALE_LOOP parameter is important for a number of PMBus commands related to output voltage trimming, margining, over/under voltage protection and the PGOOD thresholds. The output voltage of the module is set as the combination of the voltage divider formed by RTrim and a 20kΩ upper divider resistor inside the module, and the internal reference voltage of the module. The reference voltage V regulation voltage is then given by

Hence the module output voltage is dependent on the value of RTrim which is connected external to the module. The information on the output voltage divider ratio is conveyed to the module through the VOUT_SCALE_LOOP parameter which is calculated as follows:

is nominally set at 600mV, and the output

REF

CPR: Sets the response of the analog ON/OFF pin. This bit is used together with the CMD, PU and ON bits to determine startup.

PMBus Adjustable Soft Start Rise Time

The soft start rise time can be adjusted in the module via PMBus. When setting this parameter, make sure that the charging current for output capacitors can be delivered by the module in addition to any load current to avoid nuisance tripping of the overcurrent protection circuitry during startup. The TON_RISE command sets the rise time in ms, and allows

choosing soft start times between 600μs and 9ms, with

possible values listed in Table 5. Note that the exponent is fixed at -4 (decimal) and the upper two bits of the mantissa are also fixed at 0.

Table 5

The VOUT_SCALE_LOOP parameter is specified using the

“Linear” format and two bytes. The upper five bits [7:3] of the

high byte are used to set the exponent which is fixed at –9 (decimal). The remaining three bits of the high byte [2:0] and the eight bits of the lower byte are used for the mantissa. The default value of the mantissa is 00100000000 corresponding to 256 (decimal), corresponding to a divider ratio of 0.5. The maximum value of the mantissa is 512 corresponding to a divider ratio of 1. Note that the resolution of the VOUT_SCALE_LOOP command is 0.2%.

When PMBus commands are used to trim or margin the output voltage, the value of V module, which in turn changes the regulated output voltage of the module.

The nominal output voltage of the module can be adjusted with a minimum step size of 0.4% over a ±25% range from nominal using the VOUT_TRIM command over the PMBus.

The VOUT_TRIM command is used to apply a fixed offset voltage to the output voltage command value using the “Linear” mode with the exponent fixed at –10 (decimal). The value of the offset voltage is given by

is what is changed inside the

REF

This offset voltage is added to the voltage set through the divider ratio and nominal V voltage. The valid range in two’s complement for this command is –4000h to 3999h. The high order two bits of the high byte must both be either 0 or 1. If a value outside of the +/-25% adjustment range is given with this command, the module will set its output voltage to the nominal value (as if VOUT_TRIM had been set to 0), assert SMBALRT#, set the CML bit in STATUS_BYTE and the invalid data bit in STATUS_CML.

REF

to produce the trimmed output

GE

Data Sheet

40A Digital MegaDLynxTM: Non-Isolated DC-DC Power Modules

4.5Vdc –14.4Vdc input; 0.45Vdc to 2.0Vdc output; 40A Output Current

April 24, 2013

Page 18

10

)(

2)___(







TRIMVOUTHIGHMARGINVOUT

V

MHOUT10)(

2)___(







TRIMVOUTLOWMARGINVOUT

V

MLOUT

10

)_(

10

)_(

2)___(





LIMITFAULTUVVOUTV

LIMITFAULTOVVOUTV

REQUVOUT

REQOVOUT

Output Voltage Margining Using the PMBus

The module can also have its output voltage margined via PMBus commands. The command VOUT_MARGIN_HIGH sets the margin high voltage, while the command VOUT_MARGIN_LOW sets the margin low voltage. Both the VOUT_MARGIN_HIGH and VOUT_MARGIN_LOW commands use the “Linear” mode with the exponent fixed at –10 (decimal). Two bytes are used for the mantissa with the upper bit [7] of the high byte fixed at 0. The actual margined output voltage is a combination of the VOUT_MARGIN_HIGH or VOUT_MARGIN_LOW and the VOUT_TRIM values as shown below.

Note that the sum of the margin and trim voltages cannot be outside the ±25% window around the nominal output voltage. The data associated with VOUT_MARGIN_HIGH and VOUT_MARGIN_LOW can be stored to non-volatile memory using the STORE_DEFAULT_ALL command.

The module is commanded to go to the margined high or low voltages using the OPERATION command. Bits [5:2] are used to enable margining as follows:

00XX : Margin Off 0101 : Margin Low (Ignore Fault) 0110 : Margin Low (Act on Fault) 1001 : Margin High (Ignore Fault) 1010 : Margin High (Act on Fault)

PMBus Adjustable Overcurrent Warning

The module can provide an overcurrent warning via the PMBus. The threshold for the overcurrent warning can be set using the parameter IOUT_OC_WARN_LIMIT. This command

uses the “Linear” data format with a two byte data word

where the upper five bits [7:3] of the high byte represent the exponent and the remaining three bits of the high byte [2:0] and the eight bits in the low byte represent the mantissa. The exponent is fixed at –1 (decimal). The upper five bits of the mantissa are fixed at 0 while the lower six bits are programmable with a default value of 55.5A (decimal). The resolution of this warning limit is 500mA. The value of the IOUT_OC_WARN_LIMIT can be stored to non-volatile memory using the STORE_DEFAULT_ALL command.

Temperature Status via PMBus

The module can provide information related to temperature of the module through the STATUS_TEMPERATURE command. The command returns information about whether the pre-set over temperature fault threshold and/or the warning threshold have been exceeded.

PMBus Adjustable Output Over and Under Voltage Protection

The module has output over and under voltage protection capability. The PMBus command VOUT_OV_FAULT_LIMIT is used to set the output over voltage threshold from four

possible values: 108%, 110%, 112% or 115% of the commanded output voltage. The command VOUT_UV_FAULT_LIMIT sets the threshold that causes an output under voltage fault and can also be selected from four possible values: 92%, 90%, 88% or 85%. The default values are 112% and 88% of commanded output voltage. Both

commands use two data bytes formatted as two’s complement binary integers. The “Linear” mode is used with

the exponent fixed to –10 (decimal) and the effective over or under voltage trip points given by:

Values within the supported range for over and undervoltage detection thresholds will be set to the nearest fixed percentage. Note that the correct value for VOUT_SCALE_LOOP must be set in the module for the correct over or under voltage trip points to be calculated.

In addition to adjustable output voltage protection, the 40A Digital Mega DLynxTM module can also be programmed for the response to the fault. The VOUT_OV_FAULT RESPONSE and VOUT_UV_FAULT_RESPONSE commands specify the response to the fault. Both these commands use a single data byte with the possible options as shown below.

1. Continue operation without interruption (Bits [7:6]

= 00, Bits [5:3] = xxx)

2. Continue for four switching cycles and then shut

down if the fault is still present, followed by no restart or continuous restart (Bits [7:6] = 01, Bits [5:3] = 000 means no restart, Bits [5:3] = 111 means continuous restart)

3. Immediate shut down followed by no restart or

continuous restart (Bits [7:6] = 10, Bits [5:3] = 000 means no restart, Bits [5:3] = 111 means continuous restart).

4. Module output is disabled when the fault is present

and the output is enabled when the fault no longer exists (Bits [7:6] = 11, Bits [5:3] = xxx).

Note that separate response choices are possible for output over voltage or under voltage faults.

PMBus Adjustable Input Undervoltage Lockout

The module allows adjustment of the input under voltage lockout and hysteresis. The command VIN_ON allows setting the input voltage turn on threshold, while the VIN_OFF command sets the input voltage turn off threshold. For the VIN_ON command, possible values are 3.5 to 14V in 0.5V steps. For the VIN_OFF command, possible values are 3V to 14V in 0.5V steps. If other values are entered for either command, they will be mapped to the closest of the allowed values.

Both the VIN_ON and VIN_OFF commands use the “Linear”

format with two data bytes. The upper five bits represent the exponent (fixed at -2) and the remaining 11 bits represent the mantissa. For the mantissa, the four most significant bits are fixed at 0.

GE

Data Sheet

40A Digital MegaDLynxTM: Non-Isolated DC-DC Power Modules

4.5Vdc –14.4Vdc input; 0.45Vdc to 2.0Vdc output; 40A Output Current

April 24, 2013

Page 19

Power Good

10

)_(

10

)_(

2)__(





OFFGOODPOWERV

ONGOODPOWERV

OFFPGOODOUT

ONPGOODOUT

The module provides a Power Good (PGOOD) signal that is implemented with an open-drain output to indicate that the output voltage is within the regulation limits of the power module. The PGOOD signal will be de-asserted to a low state if any condition such as overtemperature, overcurrent or loss of regulation occurs that would result in the output voltage going outside the specified thresholds. The PGOOD thresholds are user selectable via the PMBus (the default values are as shown in the Feature Specifications Section). Each threshold is set up symmetrically above and below the nominal value. The POWER_GOOD_ON command sets the output voltage level above which PGOOD is asserted (lower threshold). For example, with a 1.2V nominal output voltage, the POWER_GOOD_ON threshold can set the lower threshold to

1.14 or 1.1V. Doing this will automatically set the upper thresholds to 1.26 or 1.3V.

The POWER_GOOD_OFF command sets the level below which the PGOOD command is de-asserted. This command also sets two thresholds symmetrically placed around the nominal output voltage. Normally, the POWER_GOOD_ON threshold is set higher than the POWER_GOOD_OFF threshold.

Both POWER_GOOD_ON and POWER_GOOD_OFF commands use the “Linear” format with the exponent fixed at –10 (decimal). The two thresholds are given by

Both commands use two data bytes with bit [7] of the high byte fixed at 0, while the remaining bits are r/w and used to

set the mantissa using two’s complement representation.

Both commands also use the VOUT_SCALE_LOOP parameter so it must be set correctly. The default value of POWER_GOOD_ON is set at 1.1035V and that of the POWER_GOOD_OFF is set at 1.08V. The values associated with these commands can be stored in non-volatile memory using the STORE_DEFAULT_ALL command.

The PGOOD terminal can be connected through a pullup resistor (suggested value 100K) to a source of 5VDC or lower.

Measurement of Output Current, Output Voltage and Input Voltage

The module is capable of measuring key module parameters such as output current and voltage and input voltage and providing this information through the PMBus interface. Roughly every 200μs, the module makes 16 measurements each of output current, voltage and input voltage. Average values of these 16 measurements are then calculated and placed in the appropriate registers. The values in the registers can then be read using the PMBus interface.

Measuring Output Current Using the PMBus

The module measures current by using the inductor winding resistance as a current sense element. The inductor winding resistance is then the current gain factor used to scale the measured voltage into a current reading. This gain factor is the argument of the IOUT_CAL_GAIN command, and consists

of two bytes in the linear data format. The exponent uses the upper five bits [7:3] of the high data byte in two-s complement format and is fixed at –15 (decimal). The remaining 11 bits in two’s complement binary format represent the mantissa. During manufacture, each module is calibrated by measuring and storing the current gain factor into non-volatile storage.

The current measurement accuracy is also improved by each module being calibrated during manufacture with the offset in the current reading. The IOUT_CAL_OFFSET command is used to store and read the current offset. The argument for this command consists of two bytes composed of a 5-bit exponent (fixed at -4d) and a 11-bit mantissa. This command has a resolution of 62.5mA and a range of -4000mA to +3937.5mA.

The READ_IOUT command provides module average output current information. This command only supports positive or current sourced from the module. If the converter is sinking current a reading of 0 is provided. The READ_IOUT command returns two bytes of data in the linear data format. The exponent uses the upper five bits [7:3] of the high data byte in two-s complement format and is fixed at –4 (decimal). The remaining 11 bits in two’s complement binary format represent the mantissa with the 11th bit fixed at 0 since only positive numbers are considered valid.

Note that the current reading provided by the module is not corrected for temperature. The temperature corrected current reading for module temperature T estimated using the following equation





where I

OUT_CORR

current measurement, I measurement value, T winding on the module. Since it may be difficult to measure T

, it may be approximated by an estimate of the module

IND

temperature.



󰇟

 

is the temperature corrected value of the

READ_OUT

is the temperature of the inductor

IND



󰇛



 󰇜  



is the module current

Module

can be

Measuring Output Voltage Using the PMBus

The module can provide output voltage information using the READ_VOUT command. The command returns two bytes of data all representing the mantissa while the exponent is fixed at -10 (decimal).

During manufacture of the module, offset and gain correction values are written into the non-volatile memory of the module. The command VOUT_CAL_OFFSET can be used to read and/or write the offset (two bytes consisting of a 16-bit

mantissa in two’s complement format) while the exponent is

always fixed at -10 (decimal). The allowed range for this offset correction is -125 to 124mV. The command VOUT_CAL_GAIN can be used to read and/or write the gain correction - two bytes consisting of a five-bit exponent (fixed at -8) and a 11bit mantissa. The range of this correction factor is -0.125V to +0.121V, with a resolution of 0.004V. The corrected output voltage reading is then given by:

󰇠

GE

Data Sheet

40A Digital MegaDLynxTM: Non-Isolated DC-DC Power Modules

4.5Vdc –14.4Vdc input; 0.45Vdc to 2.0Vdc output; 40A Output Current

April 24, 2013

Page 20

OFFSETCALVOUT

GAINCALVOUTInitialV

FinalV

OUT

__

)]__1()([

)(







OFFSETCALVIN

GAINCALVINInitialV

FinalV

IN

__

)]__1()([

)(







Bit Position

Flag

Default

Value

7 X 0

6

OFF

0 5 VOUT Overvoltage

0 4 IOUT Overcurrent

0

3

VIN Undervoltage

0 2 Temperature

0

1

CML (Comm. Memory Fault)

0 0 None of the above

0

Bit Position

Flag

Default

Value

7 X 0

6

OFF

0

5

VOUT Overvoltage

0 4 IOUT Overcurrent

0

3

VIN Undervoltage

0

2

Temperature

0 1 CML (Comm. Memory Fault)

0 0 None of the above

0

Bit Position

Flag

Default

Value

7

VOUT fault or warning

0 6 IOUT fault or warning

0

5 X 0

4 X 0 3 POWER_GOOD# (is negated)

0

2 X 0

1 X 0

0 X 0

Bit Position

Flag

Default

Value

7

VOUT OV Fault

0

6 X 0

5 X 0

4

VOUT UV Fault

0

3 X 0

2 X 0

1 X 0

0 X 0

Bit Position

Flag

Default

Value

7

IOUT OC Fault

0

6 X 0 5 IOUT OC Warning

0

4 X 0

3 X 0

2 X 0

1 X 0

0 X 0

Measuring Input Voltage Using the PMBus

The module can provide input voltage information using the READ_VIN command. The command returns two bytes of data in the linear format. The upper five bits [7:3] of the high data form the two’s complement representation of the exponent which is fixed at –5 (decimal). The remaining 11 bits

are used for two’s complement representation of the

mantissa, with the 11th bit fixed at zero since only positive numbers are valid.

During module manufacture, offset and gain correction values are written into the non-volatile memory of the module. The command VIN_CAL_OFFSET can be used to read and/or write the offset - two bytes consisting of a five-bit exponent (fixed at -5) and a11-bit mantissa in two’s complement format. The allowed range for this offset correction is -2 to 1.968V, and the resolution is 32mV. The command VIN_CAL_GAIN can be used to read and/or write the gain correction - two bytes consisting of a five-bit exponent (fixed at -8) and a 11-bit mantissa. The range of this correction factor is -0.125V to +0.121V, with a resolution of

0.004V. The corrected output voltage reading is then given by:

STATUS_WORD: Returns two bytes of information with a summary of the module’s fault/warning conditions.

Low Byte

High Byte

STATUS_VOUT : Returns one byte of information relating to the status of the module’s output voltage related faults.

Reading the Status of the Module using the PMBus

The module supports a number of PMBus status information commands. However, not all features are supported in these commands. A 1 in the bit position indicates the fault that is flagged. STATUS_BYTE : Returns one byte of information with a summary of the most critical device faults.

STATUS_IOUT : Returns one byte of information relating to the status of the module’s output voltage related faults.

GE

Data Sheet

40A Digital MegaDLynxTM: Non-Isolated DC-DC Power Modules

4.5Vdc –14.4Vdc input; 0.45Vdc to 2.0Vdc output; 40A Output Current

April 24, 2013

Page 21

STATUS_TEMPERATURE: Returns one byte of information

Bit Position

Flag

Default

Value

7

OT Fault

0 6 OT Warning

0

5 X 0

4 X 0

3 X 0

2 X 0

1 X 0

0 X 0

Bit Position

Flag

Default

Value

7

Invalid/Unsupported Command

0

6

Invalid/Unsupported Command

0 5 Packet Error Check Failed

0

4 X 0

3 X 0

2 X 0 1 Other Communication Fault

0

0 X 0

Bit Position

Flag

Default

Value

7:2

Module Name

000100

1:0

Reserved

10

Bit Position

Flag

Default

Value

7:0

Module Revision Number

None

1:0

Manufacturer ID

00

relating to the status of the module’s temperature related

faults.

STATUS_CML : Returns one byte of information relating to the status of the module’s communication related faults.

MFR_VIN_MIN : Returns minimum input voltage as two data bytes of information in Linear format (upper five bits are exponent – fixed at -2, and lower 11 bits are mantissa in two’s complement format – fixed at 12)

MFR_VOUT_MIN : Returns minimum output voltage as two data bytes of information in Linear format (upper five bits are exponent – fixed at -10, and lower 11 bits are mantissa in two’s complement format – fixed at 614)

MFR_SPECIFIC_00 : Returns information related to the type of module. Bits [7:2] in the Low Byte indicate the module type (000100 corresponds to the MDT040 series of module). Bits 1:0 in the High Byte are used to indicate the manufacturer ID, with 00 reserved for GE.

Low Byte

High Byte

GE

Data Sheet

40A Digital MegaDLynxTM: Non-Isolated DC-DC Power Modules

4.5Vdc –14.4Vdc input; 0.45Vdc to 2.0Vdc output; 40A Output Current

April 24, 2013

Page 22

Hex

Code

Command

Brief Description

Non-Volatile

Memory Storage

01

OPERATION

Turn Module on or off. Also used to margin the output voltage

Format

Unsigned Binary

Bit Position

7 6 5 4 3 2 1

0

Access

r/w r r/w

r/w

r/w r r

Function

On X Margin

X

Default Value

0 0 0 0 0 0 X

X

02

ON_OFF_CONFIG

Configures the ON/OFF functionality as a combination of analog ON/OFF pin and PMBus commands

Format

Unsigned Binary

Bit Position

7 6 5 4 3 2 1

0

Access

r r r

r/w

r

Function

X X X

pu

cmd

cpr

pol

cpa

Default Value

0 0 0 1 0 1 1

1

YES

03

CLEAR_FAULTS

Clear any fault bits that may have been set, also releases the SMBALERT# signal if the device has been asserting it.

10

WRITE_PROTECT

Used to control writing to the module via PMBus. Copies the current register setting in the module whose command code matches the value in the data byte into nonvolatile memory (EEPROM) on the module

Format

Unsigned Binary

Bit Position

7 6 5 4 3 2 1

0

Access

r/w

r/w x x x x

x

Function

bit7

bit6

bit5 X X X X

X

Default Value

0 0 0 X X X X

X

Bit5: 0 – Enables all writes as permitted in bit6 or bit7 1 – Disables all writes except the WRITE_PROTECT, OPERATION and ON_OFF_CONFIG (bit 6 and bit7 must be 0) Bit 6: 0 – Enables all writes as permitted in bit5 or bit7 1 – Disables all writes except for the WRITE_PROTECT and OPERATION commands (bit5 and bit7 must be 0) Bit7: 0 – Enables all writes as permitted in bit5 or bit6 1 – Disables all writes except for the WRITE_PROTECT command (bit5 and bit6 must be 0)

YES

11

STORE_DEFAULT_ALL

Copies all current register settings in the module into non-volatile memory (EEPROM) on the module. Takes about 50ms for the command to execute.

12

RESTORE_DEFAULT_ALL

Restores all current register settings in the module from values in the module nonvolatile memory (EEPROM)

13

STORE_DEFAULT_CODE

Copies the current register setting in the module whose command code matches the value in the data byte into non-volatile memory (EEPROM) on the module

Bit Position

7 6 5 4 3 2 1

0

Access

w w w w w w w

w

Function

Command code

14

RESTORE_DEFAULT_CODE

Restores the current register setting in the module whose command code matches the value in the data byte from the value in the module non-volatile memory (EEPROM)

Bit Position

7 6 5 4 3 2 1

0

Access

w w w w w w w

w

Function

Command code

20

VOUT_MODE

The module has MODE set to Linear and Exponent set to -10. These values cannot be changed

Bit Position

7 6 5 4 3 2 1

0

Access

r r r r r r r

r

Function

Mode

Exponent

Default Value

0 0 0 1 0 1 1

0

Summary of Supported PMBus Commands

Please refer to the PMBus 1.1 specification for more details of these commands.

Table 6

GE

Data Sheet

40A Digital MegaDLynxTM: Non-Isolated DC-DC Power Modules

4.5Vdc –14.4Vdc input; 0.45Vdc to 2.0Vdc output; 40A Output Current

April 24, 2013

Page 23

Hex

Code

Command

Brief Description

Non-Volatile

Memory Storage

22

VOUT_TRIM

Apply a fixed offset voltage to the output voltage command value. Exponent is fixed at -10.

Format

Linear, two’s complement binary

Bit Position

7 6 5 4 3 2 1

0

Access

r/w

Function

High Byte

Default Value

0 0 0 0 0 0 0

0

Bit Position

7 6 5 4 3 2 1

0

Access

r/w

Function

Low Byte

Default Value

0 0 0 0 0 0 0

0

YES

25

VOUT_MARGIN_HIGH

Sets the target voltage for margining the output high. Exponent is fixed at -10.

Format

Linear, two’s complement binary

Bit Position

7 6 5 4 3 2 1

0

Access

r

r/w

Function

High Byte

Default Value

0 0 0 0 0 1 0

1

Bit Position

7 6 5 4 3 2 1 0 Access

r/w

Function

Low Byte

Default Value

0 1 0 0 0 1 1

1

YES

26

VOUT_MARGIN_LOW

Sets the target voltage for margining the output low. Exponent is fixed at -10

Format

Linear, two’s complement binary

Bit Position

7 6 5 4 3 2 1

0

Access

r

r/w

Function

High Byte

Default Value

0 0 0 0 0 1 0

0

Bit Position

7 6 5 4 3 2 1

0

Access

r/w

Function

Low Byte

Default Value

0 1 0 1 0 0 0

1

YES

29

VOUT_SCALE_LOOP

Sets the scaling of the output voltage – equal to the feedback resistor divider ratio

Format

Linear, two’s complement binary

Bit Position

7 6 5 4 3 2 1

0

Access

r r r r r r r/w

r/w

Function

Exponent

Mantissa

Default Value

1 0 1 1 1 0 0

1

Bit Position

7 6 5 4 3 2 1

0

Access

r/w

Function

Mantissa

Default Value

0 0 0 0 0 0 0

0

YES

35

VIN_ON

Sets the value of input voltage at which the module turns on

Format

Linear, two’s complement binary

Bit Position

7 6 5 4 3 2 1

0

Access

r r r r r r r

r

Function

Exponent

Mantissa

Default Value

1 1 1 1 0 0 0

0

Bit Position

7 6 5 4 3 2 1

0

Access

r

r/w

Function

Mantissa

Default Value

0 0 0 0 1 1 1

0

YES

Table 6 (continued)

GE

Data Sheet

40A Digital MegaDLynxTM: Non-Isolated DC-DC Power Modules

4.5Vdc –14.4Vdc input; 0.45Vdc to 2.0Vdc output; 40A Output Current

April 24, 2013

Page 24

Hex

Code

Command

Brief Description

Non-Volatile

Memory Storage

36

VIN_OFF

Sets the value of input voltage at which the module turns off

Format

Linear, two’s complement binary

Bit Position

7 6 5 4 3 2 1

0

Access

r r r r r r r

r

Function

Exponent

Mantissa

Default Value

1 1 1 1 0 0 0

0

Bit Position

7 6 5 4 3 2 1

0

Access

r

r/w

Function

Mantissa

Default Value

0 0 0 0 1 1 0

0

YES

38

IOUT_CAL_GAIN

Returns the value of the gain correction term used to correct the measured output current

Format

Linear, two’s complement binary

Bit Position

7 6 5 4 3 2 1

0

Access

r r r r r r r

r/w

Function

Exponent

Mantissa

Default Value

1 0 0 0 1 0 0

0

Bit Position

7 6 5 4 3 2 1

0

Access

r/w

Function

Mantissa

Default Value

V: Variable based on factory calibration

YES

39

IOUT_CAL_OFFSET

Returns the value of the offset correction term used to correct the measured output current

Format

Linear, two’s complement binary

Bit Position

7 6 5 4 3 2 1

0

Access

r r r r r

r/w r r

Function

Exponent

Mantissa

Default Value

1 1 1 0 0 1 1

1

Bit Position

7 6 5 4 3 2 1

0

Access

r r r/w

r/w

Function

Mantissa

Default Value

V: Variable based on factory calibration

YES

40

VOUT_OV_FAULT_LIMIT

Sets the voltage level for an output overvoltage fault. Exponent is fixed at -10.

Format

Linear, two’s complement binary

Bit Position

7 6 5 4 3 2 1

0

Access

r

r/w

Function

High Byte

Default Value

0 0 0 0 0 1 0

1

Bit Position

7 6 5 4 3 2 1

0

Access

r/w

Function

Low Byte

Default Value

0 0 0 0 1 0 1

0

YES

41

VOUT_OV_FAULT_RESPONSE

Instructs the module on what action to take in response to a output overvoltage fault

Format

Unsigned Binary

Bit Position

7 6 5 4 3 2 1

0

Access

r/w

r/w r r

r

Function

RSP

[1]

RSP

[0]

RS[2]

RS[1]

RS[0] X X

X

Default Value

1 1 1 1 1 1 0

0

YES

Table 6 (continued)

GE

Data Sheet

40A Digital MegaDLynxTM: Non-Isolated DC-DC Power Modules

4.5Vdc –14.4Vdc input; 0.45Vdc to 2.0Vdc output; 40A Output Current

April 24, 2013

Page 25

Hex

Code

Command

Brief Description

Non-Volatile

Memory Storage

44

VOUT_UV_FAULT_LIMIT

Sets the voltage level for an output undervoltage fault. Exponent is fixed at -10.

Format

Linear, two’s complement binary

Bit Position

7 6 5 4 3 2 1

0

Access

r

r/w

Function

High Byte

Default Value

0 0 0 0 0 1 0 0 Bit Position

7 6 5 4 3 2 1

0

Access

r/w

Function

Low Byte

Default Value

1 0 0 0 1 1 1

1

YES

45

VOUT_UV_FAULT_RESPONSE

Instructs the module on what action to take in response to a output undervoltage fault

Format

Unsigned Binary

Bit Position

7 6 5 4 3 2 1

0

Access

r/w

r/w r r

r

Function

RSP

[1]

RSP

[0]

RS[2]

RS[1]

RS[0] X X

X

Default Value

0 0 0 0 0 1 0

0

YES

46

IOUT_OC_FAULT_LIMIT

Sets the output overcurrent fault level in A (cannot be changed)

Format

Linear, two’s complement binary

Bit Position

7 6 5 4 3 2 1

0

Access

r r r r r r r

r

Function

Exponent

Mantissa

Default Value

1 1 1 1 1 0 0

0

Bit Position

7 6 5 4 3 2 1

0

Access

r r r r r r r

r

Function

Mantissa

Default Value

0 1 1 1 0 1 0

0

YES

4A

IOUT_OC_WARN_LIMIT

Sets the output overcurrent warning level in A

Format

Linear, two’s complement binary

Bit Position

7 6 5 4 3 2 1

0

Access

r r r r r r r

r

Function

Exponent

Mantissa

Default Value

1 1 1 1 1 0 0

0

Bit Position

7 6 5 4 3 2 1

0

Access

r

r/w

Function

Mantissa

Default Value

0 1 1 1 0 0 1

0

YES

5E

POWER_GOOD_ON

Sets the output voltage level at which the PGOOD pin is asserted high. Exponent is fixed at -10.

Format

Linear, two’s complement binary

Bit Position

7 6 5 4 3 2 1

0

Access

r

r/w

Function

High Byte

Default Value

0 0 0 0 0 1 0

0

Bit Position

7 6 5 4 3 2 1 0 Access

r/w

Function

Low Byte

Default Value

0 1 1 0 1 0 1

0

YES

Table 6 (continued)

GE

Data Sheet

40A Digital MegaDLynxTM: Non-Isolated DC-DC Power Modules

4.5Vdc –14.4Vdc input; 0.45Vdc to 2.0Vdc output; 40A Output Current

April 24, 2013

Page 26

Hex

Code

Command

Brief Description

Non-Volatile

Memory Storage

5F

POWER_GOOD_OFF

Sets the output voltage level at which the PGOOD pin is de-asserted low. Exponent is fixed at -

10.

Format

Linear, two’s complement binary

Bit Position

7 6 5 4 3 2 1

0

Access

r

r/w

Function

High Byte

Default Value

0 0 0 0 0 1 0

0

Bit Position

7 6 5 4 3 2 1

0

Access

r/w

Function

Low Byte

Default Value

0 1 0 1 0 0 1

0

YES

61

TON_RISE

Sets the rise time of the output voltage during startup

Format

Linear, two’s complement binary

Bit Position

7 6 5 4 3 2 1

0

Access

r r r r r r r

r/w

Function

Exponent

Mantissa

Default Value

1 1 1 0 0 0 0

0

Bit Position

7 6 5 4 3 2 1

0

Access

r/w

Function

Mantissa

Default Value

0 0 1 0 1 0 1

0

YES

78

STATUS_BYTE

Returns one byte of information with a summary of the most critical module faults

Format

Unsigned Binary

Bit Position

7 6 5 4 3 2 1 0 Access

r r r r r r r

r

Flag

X

OFF

VOUT

_OV

IOUT_

OC

VIN_UV

TEMP

CML

OTHE

R

Default Value

0 0 0 0 0 0 0

0

79

STATUS_WORD

Returns two bytes of information with a summary of the module’s fault/warning conditions

Format

Unsigned binary

Bit Position

7 6 5 4 3 2 1

0

Access

r r r r r r r

r

Flag

VOUT

IOUT_

OC

X X PGOOD

X X X

Default Value

0 0 0 0 0 0 0

0

Bit Position

7 6 5 4 3 2 1

0

Access

r r r r r r r

r

Flag

X

OFF

VOUT

_OV

IOUT_

OC

VIN_UV

TEMP

CML

OTHE

R

Default Value

0 0 0 0 0 0 0

0

7A

STATUS_VOUT

Returns one byte of information with the status of the module’s output voltage related faults

Format

Unsigned Binary

Bit Position

7

6 5 4 3 2 1 0

Access

r r r r r r r

r

Flag

VOUT_OV

X X VOUT_UV

X X X

X

Default Value

0

0 0 0 0 0 0 0

7B

STATUS_IOUT

Returns one byte of information with the status of the module’s output current related faults

Format

Unsigned Binary

Bit Position

7 6 5

4 3 2 1 0

Access

r r r

r r r r r

Flag

IOUT_OC

X

IOUT_OC_WARN

X X X X X

Default Value

0 0 0

0 0 0 0 0

Table 6 (continued)

GE

Data Sheet

40A Digital MegaDLynxTM: Non-Isolated DC-DC Power Modules

4.5Vdc –14.4Vdc input; 0.45Vdc to 2.0Vdc output; 40A Output Current

April 24, 2013

Page 27

Hex

Code

Command

Brief Description

Non-Volatile

Memory Storage

7D

STATUS_TEMPERATURE

Returns one byte of information with the status of the module’s temperature related faults

Format

Unsigned Binary

Bit Position

7

6

5 4 3 2 1 0 Access

r r r r r r r

r

Flag

OT_FAULT

OT_WARN

X X X X X

X

Default Value

0

0 0 0 0 0

0

7E

STATUS_CML

Returns one byte of information with the status of the module’s communication related faults

Format

Unsigned Binary

Bit Position

7 6 5 4 3 2 1

0

Access

r r r r r r r

r

Flag

Invalid

Command

Invalid

Data

PEC Fail

X X X

Other

Comm

Fault

X

Default Value

0 0 0 0 0 0 0

0

88

READ_VIN

Returns the value of the input voltage applied to the module

Format

Linear, two’s complement binary

Bit Position

7 6 5 4 3 2 1

0

Access

r r r r r r r

r

Function

Exponent

Mantissa

Default Value

1 1 0 1 1 0 0

0

Bit Position

7 6 5 4 3 2 1

0

Access

r r r r r r r

r

Function

Mantissa

Default Value

0 0 0 0 0 0 0

0

8B

READ_VOUT

Returns the value of the output voltage of the module. Exponent is fixed at -10.

Format

Linear, two’s complement binary

Bit Position

7 6 5 4 3 2 1

0

Access

r r r r r r r

r

Function

Mantissa

Default Value

0 0 0 0 0 0 0

0

Bit Position

7 6 5 4 3 2 1

0

Access

r r r r r r r

r

Function

Mantissa

Default Value

0 0 0 0 0 0 0

0

8C

READ_IOUT

Returns the value of the output current of the module

Format

Linear, two’s complement binary

Bit Position

7 6 5 4 3 2 1

0

Access

r r r r r r r

r

Function

Exponent

Mantissa

Default Value

1 1 1 0 0 0 0

0

Bit Position

7 6 5 4 3 2 1

0

Access

r r r r r r r

r

Function

Mantissa

Default Value

0 0 0 0 0 0 0

0

98

PMBUS_REVISION

Returns one byte indicating the module is compliant to PMBus Spec. 1.1 (read only)

Format

Unsigned Binary

Bit Position

7 6 5 4 3 2 1

0

Access

r r r r r r r

r

Default Value

0 0 0 1 0 0 0

1

YES

Table 6 (continued)

GE

Data Sheet

40A Digital MegaDLynxTM: Non-Isolated DC-DC Power Modules

4.5Vdc –14.4Vdc input; 0.45Vdc to 2.0Vdc output; 40A Output Current

April 24, 2013

Page 28

Hex

Code

Command

Brief Description

Non-Volatile

Memory Storage

A0

MFR_VIN_MIN

Returns the minimum input voltage the module is specified to operate at (read only)

Format

Linear, two’s complement binary

Bit Position

7 6 5 4 3 2 1

0

Access

r r r r r r r

r

Function

Exponent

Mantissa

Default Value

1 1 1 1 0 0 0

0

Bit Position

7 6 5 4 3 2 1

0

Access

r r r r r r r

r

Function

Mantissa

Default Value

0 0 0 0 1 1 0

0

YES

A4

MFR_VOUT_MIN

Returns the minimum output voltage possible from the module (read only)

Format

Linear, two’s complement binary

Bit Position

7 6 5 4 3 2 1

0

Access

r r r r r r r

r

Function

Mantissa

Default Value

0 0 0 0 0 0 1

0

Bit Position

7 6 5 4 3 2 1

0

Access

r r r r r r r

r

Function

Mantissa

Default Value

0 1 1 0 0 1 1

0

YES

D0

MFR_SPECIFIC_00

Returns module name information (read only)

Format

Unsigned Binary

Bit Position

7 6 5 4 3 2 1

0

Access

r r r r r r r

r

Function

Reserved

Default Value

0 0 0 0 0 0 0

0

Bit Position

7 6 5 4 3 2 1

0

Access

r r r

r r r r r

Function

Module Name

Reserved

Default Value

0 0 0 1 0 0 0

0

YES

D4

VOUT_CAL_OFFSET

Applies an offset to the READ_VOUT command results to calibrate out offset errors in module measurements of the output voltage (between -125mV and +124mV). Exponent is fixed at -10.

Format

Linear, two’s complement binary

Bit Position

7 6 5 4 3 2 1

0

Access

r/w r r r r r r

r

Function

Mantissa

Default Value

V 0 0 0 0 0 0

0

Bit Position

7 6 5 4 3 2 1 0 Access

r/w

Function

Mantissa

Default Value

V V V V V V V

V

YES

D5

VOUT_CAL_GAIN

Applies a gain correction to the READ_VOUT command results to calibrate out gain errors in module measurements of the output voltage (between -0.125 and 0.121)

Format

Linear, two’s complement binary

Bit Position

7 6 5 4 3 2 1

0

Access

r r r r r r r

r/w

Function

Exponent

Mantissa

Default Value

1 1 0 0 0 0 0

V

Bit Position

7 6 5 4 3 2 1

0

Access

r/w

Function

Mantissa

Default Value

V V V V V V V

V

YES

Table 6 (continued)

GE

Data Sheet

40A Digital MegaDLynxTM: Non-Isolated DC-DC Power Modules

4.5Vdc –14.4Vdc input; 0.45Vdc to 2.0Vdc output; 40A Output Current

April 24, 2013

Page 29

TTable 6 (continued)

Hex

Code

Command

Brief Description

Non-Volatile

Memory Storage

D6

VIN_CAL_OFFSET

Applies an offset correction to the READ_VIN command results to calibrate out offset errors in module measurements of the input voltage (between -2V and +1.968V)

Format

Linear, two’s complement binary

Bit Position

7 6 5 4 3 2 1

0

Access

r r r r r/w r r

r/w

Function

Exponent

Mantissa

Default Value

1 1 0 1 V 0 0

V

Bit Position

7 6 5 4 3 2 1

0

Access

r r r/w

r/w

Function

Mantissa

Default Value

0 0 V V V V V

V

YES

D7

VIN_CAL_GAIN

Applies a gain correction to the READ_VIN command results to calibrate out gain errors in module measurements of the input voltage (between -0.125 and 0.121)

Format

Linear, two’s complement binary

Bit Position

7 6 5 4 3 2 1

0

Access

r r r r r/w r r

r/w

Function

Exponent

Mantissa

Default Value

1 1 0 0 V 0 0

V

Bit Position

7 6 5 4 3 2 1

0

Access

r r r

r/w

Function

Mantissa

Default Value

0 0 0 V V V V

V

YES

GE

Data Sheet

40A Digital MegaDLynxTM: Non-Isolated DC-DC Power Modules

4.5Vdc –14.4Vdc input; 0.45Vdc to 2.0Vdc output; 40A Output Current

April 24, 2013

Page 30

Air

flow

x

Power Module

Wind Tunnel

PWBs

12.7_

(0.50)

76.2_

(3.0)

Probe Location

for measuring

airflow and

ambient

temperature

25.4_

(1.0)

Figure 30. Thermal Test Setup.

Thermal Considerations

Power modules operate in a variety of thermal environments; however, sufficient cooling should always be provided to help ensure reliable operation.

Considerations include ambient temperature, airflow, module power dissipation, and the need for increased reliability. A reduction in the operating temperature of the module will result in an increase in reliability. The thermal data presented here is based on physical measurements taken in a wind tunnel. The test set-up is shown in Figure 30. The preferred airflow direction for the module is in Figure 31.

temperatures at these points should not exceed 130ºC. The output power of the module should not exceed the rated power of the module (Vo,set x Io,max).

Please refer to the Application Note “Thermal Characterization Process For Open-Frame Board-Mounted

Power Modules” for a detailed discussion of thermal

aspects including maximum device temperatures.

The thermal reference points, T

used in the specifications

ref

are also shown in Figure 30. For reliable operation the

Figure 31. Preferred airflow direction and location of hotspot of the module (Tref).

GE

Data Sheet

40A Digital MegaDLynxTM: Non-Isolated DC-DC Power Modules

4.5Vdc –14.4Vdc input; 0.45Vdc to 2.0Vdc output; 40A Output Current

April 24, 2013

Page 31

RADDR0

DATA

CLK

VS-

RADDR1

GND

Vin+

CI3

CO3

ADDR0

VOUT

VS+

GND

TRIM

CTUNE

RTUNE

RTrim

VIN

CO1

CI1

Vout+

ON/OFF

SEQ

SMBALRT#

MODULE

PGOOD

ADDR1

SIG_GND

SYNC

CI2

CO2

SHARE

Example Application Circuit

Requirements: Vin: 12V Vout: 1.8V Iout: 30A max., worst case load transient is from 20A to 30A Vout: 1.5% of Vout (27mV) for worst case load transient Vin, ripple 1.5% of Vin (180mV, p-p)

CI1 Decoupling cap - 1x0.01F/16V ceramic capacitor (e.g. Murata LLL185R71E103MA01) CI2 3x22F/16V ceramic capacitor (e.g. Murata GRM32ER61C226KE20) CI3 470F/16V bulk electrolytic CO1 Decoupling cap - 1x0.01F/16V ceramic capacitor (e.g. Murata LLL185R71E103MA01) CO2 4 x 47µF/6.3V ceramic capacitor (e.g. Murata GRM31CR60J476ME19) CO3 6 X330µF/6.3V Polymer (e.g. Sanyo Poscap) CTune 5600pF ceramic capacitor (can be 1206, 0805 or 0603 size) RTune 220 ohms SMT resistor (can be 1206, 0805 or 0603 size) RTrim 10k SMT resistor (can be 1206, 0805 or 0603 size, recommended tolerance of 0.1%)

Note: The DATA, CLK and SMBALRT pins do not have any pull-up resistors inside the module. Typically, the SMBus master controller will have the pull-up resistors as well as provide the driving source for these signals.

GE

Data Sheet

40A Digital MegaDLynxTM: Non-Isolated DC-DC Power Modules

4.5Vdc –14.4Vdc input; 0.45Vdc to 2.0Vdc output; 40A Output Current

April 24, 2013

Page 32

FUNCTION

1

ON/OFF

11

SIG_GND

2

VIN

12

VS- 3 SEQ

13

CLK 4 GND

14

DATA 5 VOUT

15

SYNC

6

TRIM

16

PG

7

VS+

17

SMBALERT#

8

GND

18

ADDRESS 0

9

SHARE

19

ADDRESS 1

10

GND

SIDE VIEW

BOTTOM VIEW

19

18

17

16

2

8

15 3 4 5 6 7 9

12

13

14

10

11

1

Mechanical Outline

Dimensions are in millimeters and (inches). Tolerances: x.x mm  0.5 mm (x.xx in.  0.02 in.) [unless otherwise indicated] x.xx mm  0.25 mm (x.xxx in  0.010 in.)

GE

Data Sheet

40A Digital MegaDLynxTM: Non-Isolated DC-DC Power Modules

4.5Vdc –14.4Vdc input; 0.45Vdc to 2.0Vdc output; 40A Output Current

April 24, 2013

Page 33

FUNCTION

1

ON/OFF

11

SIG_GND

2

VIN

12

VS-

3

SEQ

13

CLK 4 GND

14

DATA

5

VOUT

15

SYNC

6

TRIM

16

PG

7

VS+

17

SMBALERT#

8

GND

18

ADDRESS 0

9

SHARE

19

ADDRESS 1

10

GND

Recommended Pad Layout

Dimensions are in millimeters and (inches). Tolerances: x.x mm  0.5 mm (x.xx in.  0.02 in.) [unless otherwise indicated] x.xx mm  0.25 mm (x.xxx in  0.010 in.)

GE

Data Sheet

40A Digital MegaDLynxTM: Non-Isolated DC-DC Power Modules

4.5Vdc –14.4Vdc input; 0.45Vdc to 2.0Vdc output; 40A Output Current

April 24, 2013

Page 34

Packaging Details

The 12V Digital Mega DLynxTM 40A modules are supplied in tape & reel as standard. Modules are shipped in quantities of 140 modules per reel.

All Dimensions are in millimeters and (in inches).

Reel Dimensions:

Outside Dimensions: 330.2 mm (13.00) Inside Dimensions: 177.8 mm (7.00”) Tape Width: 56.00 mm (2.205”)

GE

Data Sheet

40A Digital MegaDLynxTM: Non-Isolated DC-DC Power Modules

4.5Vdc –14.4Vdc input; 0.45Vdc to 2.0Vdc output; 40A Output Current

April 24, 2013

Page 35

Per J-STD-020 Rev. C

0

50

100

150

200

250

300

Reflow Time (Seconds)

Reflow Temp (°C)

Heating Zone 1°C/Second

Peak Temp 260°C * Min. Time Above 235°C

15 Seconds

*Time Above 217°C

60 Seconds

Cooling Zone

Surface Mount Information

Pick and Place

The 40A Digital Mega DLynxTM modules use an open frame construction and are designed for a fully automated assembly process. The modules are fitted with a label designed to provide a large surface area for pick and place operations. The label meets all the requirements for surface mount processing, as well as safety standards, and is able to withstand reflow temperatures of up to 300oC. The label also carries product information such as product code, serial number and the location of manufacture.

Nozzle Recommendations

The module weight has been kept to a minimum by using open frame construction. Variables such as nozzle size, tip style, vacuum pressure and placement speed should be considered to optimize this process. The minimum recommended inside nozzle diameter for reliable operation is 3mm. The maximum nozzle outer diameter, which will safely fit within the allowable component spacing, is 7 mm.

Bottom Side / First Side Assembly

This module is not recommended for assembly on the bottom side of a customer board. If such an assembly is attempted, components may fall off the module during the second reflow process.

Lead Free Soldering

The modules are lead-free (Pb-free) and RoHS compliant and fully compatible in a Pb-free soldering process. Failure to observe the instructions below may result in the failure of or cause damage to the modules and can adversely affect longterm reliability.

broken, the floor life of the product at conditions of  30°C and 60% relative humidity varies according to the MSL rating (see J-STD-033A). The shelf life for dry packed SMT packages will be a minimum of 12 months from the bag seal date, when stored at the following conditions: < 40° C, < 90% relative humidity.

Figure 32. Recommended linear reflow profile using Sn/Ag/Cu solder.

Post Solder Cleaning and Drying Considerations

Post solder cleaning is usually the final circuit-board assembly process prior to electrical board testing. The result of inadequate cleaning and drying can affect both the reliability of a power module and the testability of the finished circuit-board assembly. For guidance on appropriate soldering, cleaning and drying procedures, refer to Board Mounted Power Modules: Soldering and Cleaning Application Note (AN04-001).

Pb-free Reflow Profile

Power Systems will comply with J-STD-020 Rev. C (Moisture/Reflow Sensitivity Classification for Nonhermetic Solid State Surface Mount Devices) for both Pb-free solder profiles and MSL classification procedures. This standard provides a recommended forced-air-convection reflow profile based on the volume and thickness of the package (table 4-

2). The suggested Pb-free solder paste is Sn/Ag/Cu (SAC). The recommended linear reflow profile using Sn/Ag/Cu solder is shown in Fig. 32. Soldering outside of the recommended profile requires testing to verify results and performance.

MSL Rating

The 40A Digital Mega DLynxTM modules have a MSL rating of 2a.

Storage and Handling

The recommended storage environment and handling procedures for moisture-sensitive surface mount packages is detailed in J-STD-033 Rev. A (Handling, Packing, Shipping and Use of Moisture/Reflow Sensitive Surface Mount Devices). Moisture barrier bags (MBB) with desiccant are required for MSL ratings of 2 or greater. These sealed packages should not be broken until time of use. Once the original package is

GE

Data Sheet

40A Digital MegaDLynxTM: Non-Isolated DC-DC Power Modules

4.5Vdc –14.4Vdc input; 0.45Vdc to 2.0Vdc output; 40A Output Current

Contact Us

For more information, call us at

USA/Canada:

+1 888 546 3243, or +1 972 244 9288

Asia-Pacific:

+86.021.54279977*808

Europe, Middle-East and Africa:

+49.89.74423-206

India: +91.80.28411633

www.ge.com/powerelectronics

April 24, 2013

Version 1.06

Device Codes

Input

Voltage Range

Output

Voltage

Output

Current

On/Off

Logic

Sequencing

Comcodes

MDT040A0X3-SRPHZ

4.5 – 14.4Vdc

0.45 – 2.0Vdc

40A

Negative

Yes

CC109159760

MDT040A0X43-SRPHZ

4.5 – 14.4Vdc

0.45 – 2.0Vdc

40A

Positive

Yes

CC109159777

MDT040A0X3-SRPHDZ

4.5 – 14.4Vdc

0.45 – 2.0Vdc

40A

Negative

Yes

CC150022587

Package

Identifier

Family

Input voltage

range

Output

current

Output

voltage

On/Off

logic

Options

ROHS

Compliance

M D T

040A0 X 4

-SR

-P

-H

-D

Z

P=Pico

U=Micro

M=Mega

G=Giga

D=Dlynx

Digital

V=DLynx

Analog.

T=with

EZ_Sequence

X=without

sequencing

40A

X =

programmable

output

4 =

positive

No entry

=

negative

S =

Surface

Mount

R =

Tape &

Reel

Parallelin

g

2 Extra

Ground

Pins

D = 105°C

operating

ambient,

40G

operating

shock as

per MIL

Std 810F

Z = ROHS6

Ordering Information

Please contact your GE Sales Representative for pricing, availability and optional features.

Table 7. Device Codes

-Z refers to RoHS compliant parts

Table 8. Coding Scheme

GE Energy Digital Non-Isolated DC-DC products use technology licensed from Power-One, protected by US patents: US20040246754, US2004090219A1, US2004093533A1, US2004123164A1,

US2004123167A1, US2004178780A1, US2004179382A1, US20050200344, US20050223252, US2005289373A1, US20060061214, US2006015616A1, US20060174145, US20070226526, US20070234095, US20070240000, US20080052551, US20080072080, US20080186006, US6741099, US6788036, US6936999, US6949916, US7000125, US7049798, US7068021, US7080265, US7249267, US7266709, US7315156, US7372682, US7373527, US7394445, US7456617, US7459892, US7493504, US7526660.

Outside the US the Power-One licensed technology is protected by patents: AU3287379AA, AU3287437AA, AU3290643AA, AU3291357AA, CN10371856C, CN1045261OC, CN10458656C, CN10459360C, CN10465848C, CN11069332A, CN11124619A, CN11346682A, CN1685299A, CN1685459A, CN1685582A, CN1685583A, CN1698023A, CN1802619A, EP1561156A1, EP1561268A2, EP1576710A1, EP1576711A1, EP1604254A4, EP1604264A4, EP1714369A2, EP1745536A4, EP1769382A4, EP1899789A2, EP1984801A2, W004044718A1, W004045042A3, W004045042C1, W004062061 A1, W004062062A1, W004070780A3, W004084390A3, W004084391A3, W005079227A3, W005081771A3, W006019569A3, W02007001584A3, W02007094935A3

GE Industrial Solutions 40A Digital MegaDLynx User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual