GE Industrial Solutions 40A Analog 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, Class II
 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.

 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 Analog MegaDLynxTM 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

0.6Vdc to 2.0Vdc, programmable via an external resistor. Features include remote On/Off, adjustable output voltage, over current and
overtemperature protection. 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

TRIM

VOUT

VS+

GND

RTUNE

CTUNE

RTrim

VIN

Co

Cin

Vout+

Vin+

ON/OFF

SEQ

MODULE

PGOOD

SIG_GND

VS-

GND

SYNC

RoHS Compliant

SHARE

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

4.5Vdc –14.4Vdc input; 0.6Vdc to 2.0Vdc output; 40A Output Current

GE

Data Sheet

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

4.5Vdc –14.4Vdc input; 0.6Vdc 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

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 Analog MegaDLynxTM: Non-Isolated DC-DC Power Modules

4.5Vdc –14.4Vdc input; 0.6Vdc to 2.0Vdc output; 40A Output Current

April 24, 2013

©2012 General Electric Company. All rights reserved.

Page 3

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

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

Electrical Specifications (continued)

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 Analog MegaDLynxTM: Non-Isolated DC-DC Power Modules

4.5Vdc –14.4Vdc input; 0.6Vdc 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 6,498,438

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 Analog MegaDLynxTM: Non-Isolated DC-DC Power Modules

4.5Vdc –14.4Vdc input; 0.6Vdc to 2.0Vdc output; 40A Output Current

April 24, 2013

©2012 General Electric Company. All rights reserved.

Page 5

Parameter

Device

Symbol

Min

Typ

Max

Units

Over Temperature Protection
(See Thermal Considerations section)

All

T

ref

145 °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

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

Feature Specifications (Continued)

GE

Data Sheet

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

4.5Vdc –14.4Vdc input; 0.6Vdc to 2.0Vdc output; 40A Output Current

April 24, 2013

©2012 General Electric Company. All rights reserved.

Page 6

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 Analog MegaDLynxTM at 0.6Vo and 25oC.

GE

Data Sheet

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

4.5Vdc –14.4Vdc input; 0.6Vdc 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 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) Vin (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 Analog MegaDLynxTM at 1.2Vo and 25oC.

GE

Data Sheet

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

4.5Vdc –14.4Vdc input; 0.6Vdc 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 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 Analog MegaDLynxTM at 1.8Vo and 25oC.

GE

Data Sheet

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

4.5Vdc –14.4Vdc input; 0.6Vdc to 2.0Vdc output; 40A Output Current

April 24, 2013

©2012 General Electric Company. All rights reserved.

Page 9

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 Analog MegaDLynxTM 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 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.

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.

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 Analog MegaDLynxTM: Non-Isolated DC-DC Power Modules

4.5Vdc –14.4Vdc input; 0.6Vdc to 2.0Vdc output; 40A Output Current

April 24, 2013

©2012 General Electric Company. All rights reserved.

Page 10

V

O

(+)

TRIM

VS─

R

trim

LOAD

V

IN

(+)

ON/OFF

VS+

SIG_GND

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

Analog Feature Descriptions

Remote On/Off

The 40A Analog MegaDLynxTM 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..

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 0.8V,
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.

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

Caution – Do not connect SIG_GND to GND elsewhere in the

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

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:

GE

Data Sheet

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

4.5Vdc –14.4Vdc input; 0.6Vdc to 2.0Vdc output; 40A Output Current

April 24, 2013

©2012 General Electric Company. All rights reserved.

Page 11

 















 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

100 pF

DLynx Module

R1=Rtrim

20K

SIG_GND

SEQ

SEQ

V

Vo

MODULE

SIG_GND

Trim

Q1

Rtrim

Rmargin-up

Q2

Rmargin-down

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

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

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
10ms to ensure that the module output is ramped up
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.

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

Figure 25. Circuit Configuration for margining Output
voltage.

Output Voltage Sequencing

The power module includes a sequencing feature, EZ­SEQUENCE that enables users to implement various types of

current-limit inception, the unit enters hiccup mode. The unit
operates normally once the output current is brought back
into its specified range.

Overtemperature Protection

To provide protection in a fault condition, the unit is
equipped with a thermal shutdown circuit. The unit will shut

GE

Data Sheet

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

4.5Vdc –14.4Vdc input; 0.6Vdc to 2.0Vdc output; 40A Output Current

April 24, 2013

©2012 General Electric Company. All rights reserved.

Page 12

MODULE

SYNC

GND

+

─

down if the overtemperature threshold of 145°C (typ) is
exceeded at the thermal reference point T
goes into thermal shutdown it will then wait to cool before
attempting to restart.

.Once the unit

ref

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.

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.

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

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 the 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
four MegaDLynxTM converters in parallel, the total
current drawn should be less that 90% of (3 x 40A), i.e.
less than 108 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.

GE

Data Sheet

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

4.5Vdc –14.4Vdc input; 0.6Vdc to 2.0Vdc output; 40A Output Current

April 24, 2013

©2012 General Electric Company. All rights reserved.

Page 13

CO 6x

47µF

8x

47µF

10x

47µF

12x

47µF

20x

47µF

R

TUNE

330Ω

330Ω

330Ω

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

Power Good

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 over-temperature, overcurrent or
loss of regulation occurs that would result in the output
voltage going outside the specified thresholds.

The default value of PGOOD ON thresholds are set at ±8% of
the nominal Vset value, and PGOOD OFF thresholds are set
at ±10% of the nominal Vset. For example, if the nominal
voltage (Vset) is set at 1.0V, then the PGOOD ON thresholds
will be active anytime the output voltage is between 0.92V
and 1.08V, and PGOOD OFF thresholds are active at 0.90V
and 1.10V respectively.

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

Dual Layout

Identical dimensions and pin layout of Analog and Digital
MegaDLynx 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.

Tunable Loop

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
and to reduce output voltage deviations from the steady­state 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.

TM

the recommended values of R

TUNE

and C

for different

TUNE

values of ceramic output capacitors up to 1000uF that
might be needed for an application to meet output ripple
and noise requirements. Selecting R

TUNE

and C

according

TUNE

to Table 2 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

TUNE

and C

in order to meet 2% output

TUNE

voltage deviation limits 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.

Table 2. General recommended values of of R
C

for Vin=12V and various external ceramic capacitor

TUNE

TUNE

and

combination

Table 3. Recommended values of R

TUNE

and C

TUNE

to obtain
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.

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

29. The preferred airflow direction for the module is in
Figure 30.

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

Recommended values of R
capacitor combinations are given in Table 2. Table 2 shows

to tune the control loop of the module.

TUNE

and C

TUNE

for different output

TUNE

TUME

GE

Data Sheet

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

4.5Vdc –14.4Vdc input; 0.6Vdc to 2.0Vdc output; 40A Output Current

April 24, 2013

©2012 General Electric Company. All rights reserved.

Page 14

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 29. Thermal Test Setup.

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

Figure 30. Preferred airflow direction and location of hot­spot of the module (Tref).

GE

Data Sheet

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

4.5Vdc –14.4Vdc input; 0.6Vdc to 2.0Vdc output; 40A Output Current

April 24, 2013

©2012 General Electric Company. All rights reserved.

Page 15

VS-

GND

Vin+

CI3

CO3

VOUT

VS+

GND

TRIM

CTUNE

RTUNE

RTrim

VIN

CO1

CI1

Vout+

ON/OFF

SEQ

MODULE

PGOOD

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%)

GE

Data Sheet

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

4.5Vdc –14.4Vdc input; 0.6Vdc to 2.0Vdc output; 40A Output Current

April 24, 2013

©2012 General Electric Company. All rights reserved.

Page 16

FUNCTION

PIN

FUNCTION

1

ON/OFF

11

SIG_GND

2

VIN

12

VS- 3 SEQ

13

NC

4

GND

14

NC

5

VOUT

15

SYNC

6

TRIM

16

PG

7

VS+

17

NC 8 GND

18

NC

9

SHARE

19

NC

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 Analog MegaDLynxTM: Non-Isolated DC-DC Power Modules

4.5Vdc –14.4Vdc input; 0.6Vdc to 2.0Vdc output; 40A Output Current

April 24, 2013

©2012 General Electric Company. All rights reserved.

Page 17

PIN

FUNCTION

PIN

FUNCTION

1

ON/OFF

11

SIG_GND

2

VIN

12

VS- 3 SEQ

13

NC 4 GND

14

NC 5 VOUT

15

SYNC

6

TRIM

16

PG

7

VS+

17

NC 8 GND

18

NC 9 SHARE

19

NC

10

GND

NC

NC

NC

NC

NC

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 Analog MegaDLynxTM: Non-Isolated DC-DC Power Modules

4.5Vdc –14.4Vdc input; 0.6Vdc to 2.0Vdc output; 40A Output Current

April 24, 2013

©2012 General Electric Company. All rights reserved.

Page 18

Packaging Details

The 12V Analog MegaDLynxTM 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 Analog MegaDLynxTM: Non-Isolated DC-DC Power Modules

4.5Vdc –14.4Vdc input; 0.6Vdc to 2.0Vdc output; 40A Output Current

April 24, 2013

©2012 General Electric Company. All rights reserved.

Page 19

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 Analog MegaDLynxTM 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.

not be broken until time of use. Once the original package is
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 31. 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. 31. Soldering outside of the recommended
profile requires testing to verify results and performance.

MSL Rating

The 40A Analog MegaDLynxTM 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

GE

Data Sheet

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

4.5Vdc –14.4Vdc input; 0.6Vdc to 2.0Vdc output; 40A Output Current

Contact Us

For more information, call us at

USA/Canada:

[phone], or [phone]

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

©2013 General Electric Company. All rights reserved.

Version 1.05

Device Code

Input

Voltage Range

Output

Voltage

Output

Current

On/Off

Logic

Sequencing

Comcodes

MVT040A0X3-SRPHZ

4.5 – 14.4Vdc

0.6 – 2.0Vdc

40A

Negative

Yes

CC109159785

MVT040A0X43-SRPHZ

4.5 – 14.4Vdc

0.6 – 2.0Vdc

40A

Positive

Yes

CC109159793

MVT040A0X3-SRPHDZ

4.5 – 14.4Vdc

0.6 – 2.0Vdc

40A

Negative

Yes

CC150022588

Package

Identifier

Family

Input voltage

range

Outpu

t

curren

t

Output

voltage

On/Off

logic

Options

ROHS

Complian

ce

M V 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

Paralleling

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 4. Device Codes

-Z refers to RoHS compliant parts

Table 5. 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