GE Industrial Solutions 40A Digital MegaDLynx User Manual

GE

Data Sheet

April 24, 2013

©2012 General Electric Company. All rights reserved.

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

©2012 General Electric Company. All rights reserved.

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

©2012 General Electric Company. All rights reserved.

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

©2012 General Electric Company. All rights reserved.

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

©2012 General Electric Company. All rights reserved.

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

©2012 General Electric Company. All rights reserved.

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

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

©2012 General Electric Company. All rights reserved.

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)

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

©2012 General Electric Company. All rights reserved.

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)

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

©2012 General Electric Company. All rights reserved.

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)

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

©2012 General Electric Company. All rights reserved.

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

©2012 General Electric Company. All rights reserved.

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.