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
Features
RoHS Compliant
Applications
▪
Compliant to RoHS Directive 2011/65/EU and amended
Directive (EU) 2015/863.
▪
Compliant to REACH Directive (EC) No 1907/2006
▪
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 PMBusTM # protocol
▪
Tunable LoopTM to optimize dynamic output voltage
response
▪
Power Good signal
▪
Fixed switching frequency with capability of external
synchronization
•
Industrial equipment
•
Distributed power architectures
▪
Output overcurrent protection (non-latching)
•
Intermediate bus voltage applications
▪
Over temperature protection
•
Telecommunications equipment
▪
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)
•
Servers and storage applications
•
Networking equipment
Vin+
VIN
PGOOD
Vout+
VOUT
VS+
RTUNE
MODULE
SEQ
Cin
Co
Ruggedized (-D) version able to withstand high levels of shock
and vibration
▪
ANSI/UL* 62368-1 and CAN/CSA† C22.2 No. 62368-1 Recognized,
DIN VDE‡ 0868-1/A11:2017 (EN62368-1:2014/A11:2017)
RTrim
RADDR1
RADDR0
Wide operating temperature range [-40°C to 105°C
(Ruggedized: -D), 85°C(Regular).
▪
CTUNE
CLK
TRIM
DATA
ADDR0
SMBALRT#
ADDR1
ON/OFF
SHARE
▪
▪
ISO** 9001 and ISO 14001 certified manufacturing facilities
SIG_GND
SYNC GND VS-
GND
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)
August 25, 2020
©2016 General Electric Company. All rights reserved.
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
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.
Parameter
Device
Symbol
Min
Max
Unit
Input Voltage
All
VIN
-0.3
15
V
V
Continuous
SEQ, SYNC, VS+
All
7
CLK, DATA, SMBALERT#
All
3.6
V
Operating Ambient Temperature
All
TA
-40
105
°C
All
Tstg
-55
125
°C
(see Thermal Considerations section)
Storage Temperature
Electrical Specifications
Unless otherwise indicated, specifications apply over all operating input voltage, resistive load, and temperature conditions.
Parameter
Device
Symbol
Min
Typ
Max
Unit
4.5
⎯
14.4
Vdc
24
Adc
Operating Input Voltage
All
VIN
Maximum Input Current
All
IIN,max
VO,set = 0.6 Vdc
IIN,No load
54.7
mA
(VIN=4.5V to 14V, IO=IO, max )
Input No Load Current
(VIN = 12Vdc, IO = 0, module enabled)
VO,set = 2Vdc
IIN,No load
104
mA
Input Stand-by Current
(VIN = 12Vdc, module disabled)
All
IIN,stand-by
12.5
mA
Inrush Transient
All
I2t
Input Reflected Ripple Current, peak-to-peak
(5Hz to 20MHz, 1μH source impedance; VIN =0 to 14V, IO=
IOmax ; See Test Configurations)
All
90
mAp-p
Input Ripple Rejection (120Hz)
All
-60
dB
August 25, 2020
©2016 General Electric Company. All rights reserved.
1
A2s
Page 2
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
Electrical Specifications (continued)
Parameter
Device
Symbol
Min
Output Voltage Set-point (with 0.1% tolerance for external
resistor used to set output voltage)
All
VO, set
-1.0
Output Voltage (Over all operating input voltage, resistive
load, and temperature conditions until end of life)
All
VO, set
-3.0
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
PMBus Adjustable Output Voltage Range
All
VO,adj
-25
PMBus Output Voltage Adjustment Step Size
All
Remote Sense Range
All
Typ
⎯
0
Max
Unit
+1.0
% VO, set
+3.0
% VO, set
2.0
Vdc
+25
%VO,set
0.4
%VO,set
0.5
Vdc
⎯
6
mV
10
Output Regulation
Line (VIN=VIN, min to VIN, max)
All
Load (IO=IO, min to IO, max)
All
⎯
Temperature (Tref=TA, min to TA, max)
All
0.4
Output Ripple and Noise on nominal output
(VIN=VIN, nom and IO=IO, min to IO, max Co = 0.1μF // 22 μF
ceramic capacitors)
Peak-to-Peak (5Hz to 20MHz bandwidth)
⎯
All
RMS (5Hz to 20MHz bandwidth)
All
mV
% VO, set
50
100
mVpk-pk
20
38
mVrms
External Capacitance1
Without the Tunable LoopTM
All
CO, max
6x47
⎯
6x47
μF
ESR ≥ 0.15 mΩ
All
CO, max
6x47
⎯
7000
μF
ESR ≥ 10 mΩ
All
CO, 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
IO, lim
150
180
% Io,max
Output Short-Circuit Current
All
IO, s/c
2.1
2.83
Arms
VO,set = 0.6Vdc
η
VIN= 12Vdc, TA=25°C
VO, set = 1.2Vdc
IO=IO, max , VO= VO,set
VO,set = 1.8Vdc
Switching Frequency
All
Frequency Synchronization
All
ESR ≥ 1 mΩ
With the Tunable
LoopTM
(VO≤250mV) ( Hiccup Mode )
Efficiency
78.0
81.3
%
η
84.0
88.5
%
η
85.25
91.5
%
fsw
380
400
350
420
kHz
480
kHz
Synchronization Frequency Range
All
High-Level Input Voltage
All
VIH
Low-Level Input Voltage
All
VIL
Input Current, SYNC
All
ISYNC
Minimum Pulse Width, SYNC
All
tSYNC
100
ns
Maximum SYNC rise time
All
tSYNC_SH
100
ns
2.0
V
0.4
V
100
nA
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.
August 25, 2020
©2016 General Electric Company. All rights reserved.
Page 3
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
General Specifications
Parameter
Device
Calculated MTBF (IO=0.8IO, max, TA=40°C) Telecordia Issue 2
Method 1 Case 3
Min
All
Typ
Max
6,498,438
10.53
(0.37)
Weight
11.7
(0.41)
Unit
Hours
12.87
(0.45)
g (oz.)
Feature Specifications
Unless otherwise indicated, specifications apply over all operating input voltage, resistive load, and temperature conditions. See Feature
Descriptions for additional information.
Parameter
Device
Symbol
Min
Typ
Max
Unit
On/Off Signal Interface
(VIN=VIN, min to VIN, 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
⎯
VIN,max
V
Input Low Current
All
IIL
⎯
⎯
1
mA
Input Low Voltage
All
VIL
-0.3
⎯
0.4
V
Input High Current
All
IIH
―
―
1
mA
Input High Voltage
All
VIH
2
―
VIN, max
Vdc
Input low Current
All
IIL
―
―
10
μA
Input Low Voltage
All
VIL
-0.2
―
0.4
Vdc
Case 1: On/Off input is enabled and then input power is
applied (delay from instant at which VIN = VIN, min until Vo =
10% of Vo, set)
All
Tdelay
1.0
1.1
1.7
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
600
700
1800
μsec
Output voltage Rise time (time for Vo to rise from
10% of Vo, set to 90% of Vo, set)
All
Trise
1.2
1.5
2.2
msec
0
1.5
3.0
% VO, set
Logic Low (Module OFF)
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)
Logic Low (Module ON)
Turn-On Delay and Rise Times
(VIN=VIN, nom, IO=IO, max , VO to within ±1% of steady state)
Output voltage overshoot (TA = 25oC
VIN= VIN, min to VIN, max,IO = IO, min to IO, max)
With or without maximum external capacitance
August 25, 2020
©2016 General Electric Company. All rights reserved.
Page 4
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
Feature Specifications (cont.)
Parameter
Device
Symbol
Min
Typ
Max
Units
Over Temperature Protection
(See Thermal Considerations section)
All
Tref
123
130
137
°C
PMBus Over Temperature Warning Threshold*
All
TWARN
120
130
140
°C
Tracking Accuracy
(Power-Up: 0.5V/ms)
All
VSEQ –Vo
100
mV
(Power-Down: 0.5V/ms)
All
VSEQ –Vo
100
mV
(VIN, min to VIN, max; IO, min to IO, max VSEQ < Vo)
Input Undervoltage Lockout
Turn-on Threshold
All
4.144
4.25
4.407
Vdc
Turn-off Threshold
All
3.947
3.98
4.163
Vdc
Hysteresis
All
0.25
0.3
0.35
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, Vsupply 5VDC
Overvoltage threshold for PGOOD ON
All
103
108
113
%VO, set
Overvoltage threshold for PGOOD OFF
All
105
110
115
%VO, set
Undervoltage threshold for PGOOD ON
All
87
92
97
%VO, set
Undervoltage threshold for PGOOD OFF
All
85
90
95
%VO, 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.
August 25, 2020
©2016 General Electric Company. All rights reserved.
Page 5
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
Digital Interface Specifications
Unless otherwise indicated, specifications apply over all operating input voltage, resistive load, and temperature conditions. See Feature
Descriptions for additional information.
Parameter
Conditions
Symbol
Min
Input High Voltage (CLK, DATA)
VIH
2.1
Input Low Voltage (CLK, DATA)
VIL
Input high level current (CLK, DATA)
IIH
Input low level current (CLK, DATA)
IIL
Typ
Max
Unit
3.6
V
0.8
V
-10
10
μA
-10
10
μA
0.4
V
10
μA
PMBus Signal Interface Characteristics
Output Low Voltage (CLK, DATA, SMBALERT#)
IOUT=2mA
VOL
Output high level open drain leakage current (DATA,
SMBALERT#)
VOUT=3.6V
IOH
Pin capacitance
0
CO
PMBus Operating frequency range
Slave Mode
0.7
pF
FPMB
10
tHD:DAT
0
300
ns
tSU:DAT
250
ns
Read delay time
tDLY
153
Output current measurement range
IRNG
0
Output current measurement resolution
IRES
62.5
Output current measurement gain accuracy (at 25°C)
IACC
±5
%
Output current measurement offset
IOFST
0.1
A
2.0
V
Receive Mode
Transmit Mode
Data hold time
Data setup time
400
kHz
Measurement System Characteristics
VOUT measurement range
VOUT(rng)
192
231
40
μs
A
mA
0
VOUT measurement resolution
VOUT(res)
VOUT measurement gain accuracy
VOUT(gain)
-2
2
LSB
VOUT measurement offset
VOUT(ofst)
-3
3
%
VOUT measurement accuracy
VOUT(ACC)
-15
+15
%
VIN(rng)
0
14.4
V
VIN measurement range
16.25
mV
VIN measurement resolution
VIN(res)
VIN measurement gain accuracy
VIN(gain)
-2
2
LSB
VIN measurement offset
VIN(ofst)
-5.5
1.4
%
VIN
-3
+3
%
VIN measurement accuracy
August 25, 2020
©2016 General Electric Company. All rights reserved.
32.5
mV
Page 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
Characteristic Curves
The following figures provide typical characteristics for the 40A Digital Mega DLynxTM at 0.6Vo and 25oC.
90
45
EFFICIENCY, (%)
OUTPUT CURRENT, Io (A)
40
85
Vin=4.5V
80
Vin=12V
Vin=14V
75
70
0.5m/s
(100LFM)
30
1m/s
(200LFM)
25
Standard Part
(85 C)
20
Ruggedized (D)
Part (105 C)
15
0
10
20
30
40
45
OUTPUT CURRENT, IO (A)
55
95
105
OUTPUT VOLTAGE
VO (V) (20mV/div)
IO (A) (20A/div)
TIME, t (20s /div)
INPUT VOLTAGE
VIN (V) (5V/div)
VO (V) (200mV/div)
Figure 4. Transient Response to Dynamic Load Change from 50%
to 100% at 12Vin, Cout= 12x680uF+6x47uF, CTune=47nF,
RTune=180 ohms
OUTPUT VOLTAGE
VO (V) (200mV/div)
VON/OFF (V) (5V/div)
Figure 3. Typical output ripple and noise (CO=6x47uF ceramic,
VIN = 12V, Io = Io,max, ).
OUTPUT VOLTAGE ON/OFF VOLTAGE
2m/s
(400LFM)
65
75
85
AMBIENT TEMPERATURE, TA OC
TIME, t (1s/div)
TIME, t (1ms/div)
TIME, t (1ms/div)
Figure 5. Typical Start-up Using On/Off Voltage (Io = Io,max).
August 25, 2020
1.5m/s
(300LFM)
Figure 2. Derating Output Current versus Ambient Temperature
and Airflow.
OUTPUT CURRENT,
VO (V) (10mV/div)
Figure 1. Converter Efficiency versus Output Current.
OUTPUT VOLTAGE
NC
35
Figure 6. Typical Start-up Using Input Voltage (VIN = 12V, Io =
Io,max).
©2016 General Electric Company. All rights reserved.
Page 7
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
Characteristic Curves
The following figures provide typical characteristics for the 40A Digital Mega DLynxTM at 1.2Vo and 25oC.
95
45
40
Vin=4.5V
Vin=12V
85
OUTPUT CURRENT, Io (A)
EFFICIENCY, (%)
90
Vin=14.4V
80
75
NC
0.5m/s
(100LFM)
30
1m/s
(200LFM)
25
20
Standard Part
(85 C)
15
Ruggedized (D)
Part (105 C)
0
10
20
30
45
40
2m/s
(400LFM)
65
OUTPUT VOLTAGE
VO (V) (20mV/div)
IO (A) (20A/div)
TIME, t (1s/div)
85
95
105
TIME, t (20s /div)
INPUT VOLTAGE
VIN (V) (5V/div)
VO (V) (500mV/div)
Figure 10. Transient Response to Dynamic Load Change from 50%
to 100% at 12Vin, Cout= 6x330uF, CTune=12nF & RTune=200
ohms
OUTPUT VOLTAGE
VO (V) (500mV/div)
VON/OFF (V) (5V/div)
Figure 9. Typical output ripple and noise (CO= 6x47uF ceramic,
VIN = 12V, Io = Io,max, ).
TIME, t (1ms/div)
TIME, t (1ms/div)
Figure 11. Typical Start-up Using On/Off Voltage (Io = Io,max).
August 25, 2020
75
Figure 8. Derating Output Current versus Ambient Temperature
and Airflow.
OUTPUT CURRENT,
VO (V) (10mV/div)
Figure 7. Converter Efficiency versus Output Current.
55
AMBIENT TEMPERATURE, TA OC
OUTPUT CURRENT, IO (A)
OUTPUT VOLTAGE ON/OFF VOLTAGE
1.5m/s
(300LFM)
10
70
OUTPUT VOLTAGE
35
Figure 12. Typical Start-up Using Input Voltage (VIN = 12V, Io =
Io,max).
©2016 General Electric Company. All rights reserved.
Page 8
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
Characteristic Curves
The following figures provide typical characteristics for the 40A Digital Mega DLynxTM at 1.8Vo and 25oC.
100
45
Vin=12V
40
OUTPUT CURRENT, Io (A)
EFFICIENCY, (%)
95
90
Vin=4.5V
85
Vin=14.4V
80
75
NC
30
0.5m/s
(100LFM)
25
1.5m/s
20
15
Standard Part
(85 C)
10
Ruggedized (D)
Part (105 C)
2m/s
(400LFM)
20
30
OUTPUT CURRENT, IO (A)
45
40
OUTPUT CURRENT,
VO (V) (20mV/div)
65
75
85
AMBIENT TEMPERATURE, TA OC
TIME, t (1s/div)
105
TIME, t (20s /div)
OUTPUT VOLTAGE
VO (V) (500mV/div)
VIN (V) (5V/div)
INPUT VOLTAGE
Figure 16. Transient Response to Dynamic Load Change from
50% to 100% at 12Vin, Cout= 6x330uF, CTune=5.6nF &
RTune=220 ohms
VO (V) (500mV/div)
VON/OFF (V) (5V/div)
Figure 15. Typical output ripple and noise (CO=6x47uF ceramic,
VIN = 12V, Io = Io,max, ).
TIME, t (1ms/div)
TIME, t (1ms/div)
Figure 17. Typical Start-up Using On/Off Voltage (Io = Io,max).
August 25, 2020
95
Figure 14. Derating Output Current versus Ambient Temperature
and Airflow.
OUTPUT VOLTAGE
Figure 13. Converter Efficiency versus Output Current.
55
VO (V) (20mV/div)
10
IO (A) (20A/div)
0
OUTPUT VOLTAGE ON/OFF VOLTAGE
1m/s
(200LFM)
5
70
OUTPUT VOLTAGE
35
Figure 18. Typical Start-up Using Input Voltage (VIN = 12V, Io =
Io,max).
©2016 General Electric Company. All rights reserved.
Page 9
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
Design Considerations
40
6x47uF Ext Cap
Input Filtering
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.
Ripple (mVp-p)
8x47uF Ext Cap
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.
30
10x47uF Ext Cap
20
10
0
0.6
Ripple Voltage (mVpk-pk)
400
0.8
4x22uF Ext Cap
350
1
1.2
1.4
1.6
1.8
2
Output Voltage(Volts)
6x22uF Ext Cap
8x22uF Ext Cap
300
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
250
200
150
Safety Considerations
100
50
0.6
0.8
1
1.2
1.4
1.6
1.8
2
Output Voltage (Volts)
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.
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
ANSI/UL* 62368-1 and CAN/CSA+ C22.2 No. 62368-1
Recognized, DIN VDE 0868-1/A11:2017 (EN623681:2014/A11:2017.
For the converter output to be considered meeting the
Requirements of safety extra-low voltage (SELV) or ES1, the
input must meet SELV/ES1 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.
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.
August 25, 2020
©2016 General Electric Company. All rights reserved.
Page 10
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
Analog Feature Descriptions
MODULE
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.
PWM Enable
VIN+
Rpullup
Internal
Pullup
I
ON/OFF
ON/OFF
470
+
VON/OFF
10K
Q3
22K
Q1
22K
10K
GND
_
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
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..
MODULE
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.
VIN+
PWM Enable
Rpullup
I
+
VON/OFF
ON/OFF
Internal
Pullup
CR1
ON/OFF
470
10K
Q1
10K
GND
_
Figure 21. Circuit configuration for using positive On/Off
logic.
August 25, 2020
©2016 General Electric Company. All rights reserved.
Page 11
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
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
Figure 23. Output Voltage vs. Input Voltage Set Point Area
plot showing limits where the output voltage can be set for
different input voltages.
VIN(+)
VO(+)
VS+
ON/OFF
LOAD
TRIM
Output voltage margining can be implemented in the module
by connecting a resistor, Rmargin-up, from the Trim pin to the
ground pin for margining-up the output voltage and by
connecting a resistor, Rmargin-down, from the Trim pin to output
pin for margining-down. Figure 25 shows the circuit
configuration for output voltage margining. The POL
Programming Tool, available at www.GEpower.com under the
Downloads section, also calculates the values of Rmargin-up and
Rmargin-down for a specific output voltage and % margin. Please
consult your local GE technical representative for additional
details.
Vo
Rtrim
Rmargin-down
MODULE
SIG_GND
VS─
Q2
Trim
Caution – Do not connect SIG_GND to GND elsewhere in the
layout
Rmargin-up
Rtrim
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:
Q1
SIG_GND
Figure 25. Circuit Configuration for margining Output
voltage.
12
Rtrim =
k
(Vo − 0.6)
Digital Output Voltage Margining
Rtrim is the external resistor in kΩ
Please see the Digital Feature Descriptions section.
Vo is the desired output voltage.
Output Voltage Sequencing
Table 1 provides Rtrim values required for some common
output voltages.
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.
Table 1
VO, set (V)
0.6
0.9
1.0
1.2
1.5
1.8
August 25, 2020
Rtrim (KΩ)
Open
40
30
20
13.33
10
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.
©2016 General Electric Company. All rights reserved.
Page 12
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
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.
DLynx Module
V
SEQ
The MDT040 module can achieve 100% load transient above
0ºC ambient temperature. Below 0 ºC ambient temperature,
the load transient is limited to a maximum of 62.5% of specified
full load current.
Digital Adjustable Overcurrent Warning
Please see the Digital Feature Descriptions section.
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 Tref .Once the unit goes into thermal
shutdown it will then wait to cool before attempting to restart.
20K
SEQ
R1=Rtrim
100 pF
Digital Temperature Status via PMBus
SIG_GND
Please see the Digital Feature Descriptions section.
Figure 26. Circuit showing connection of the sequencing
signal to the SEQ pin.
Digitally Adjustable Output Over and Under Voltage
Protection
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.
Please see the Digital Feature Descriptions section.
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 set-point
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).
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.
MODULE
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.
Load Transient Considerations
August 25, 2020
SYNC
+
─
GND
Figure 27. External source connections to synchronize
switching frequency of the module.
©2016 General Electric Company. All rights reserved.
Page 13
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
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.
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.
•
For converters operating in parallel, tunable loop
components “RTUNE” and “CTUNE” must be selected to
meet the required transient specification. For providing
better noise immunity, we recommend that RTUNE value
to be greater than 300Ω.
•
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.
Some special considerations apply for design of converters in
parallel operation:
Measuring Output Current, Output Voltage and Input
Voltage
•
Please see the Digital Feature Descriptions section.
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
August 25, 2020
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.
©2016 General Electric Company. All rights reserved.
Page 14
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
Tunable LoopTM
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.
VOUT
VS+
Table 2. General recommended values of of RTUNE and CTUNE
for Vin=12V and various external ceramic capacitor
combination
CO
RTUNE
6x
47µF
330Ω
8x
47µF
330Ω
10x
47µF
330Ω
12x
47µF
330Ω
20x
47µF
200Ω
CTUNE
330pF
820pF
1200pF
1500pF
3300pF
Table 3. Recommended values of RTUNE and CTUNE to obtain
transient deviation of 2% of Vout for a 20A step load with
Vin=12V.
VO
CO
RTUNE
CTUNE
∆V
1.8V
4x47uF +
6x330µF
polymer
220 Ω
5600pF
34mV
1.2V
4x47uF +
11x330µF
polymer
200 Ω
12nF
22mV
0.6V
4x47uF +
12x680µF
polymer
180 Ω
47nF
12mV
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.
RTune
MODULE
CO
CTune
T RIM
RTr im
SIG_GND
GND
Figure. 28. Circuit diagram showing connection of RTUNE and
CTUNE to tune the control loop of the module.
Recommended values of RTUNE and CTUNE for different output
capacitor combinations are given in Table 2. Table 2 shows the
recommended values of RTUNE and CTUNE for different values of
ceramic output capacitors up to 1000uF that might be needed
for an application to meet output ripple and noise
requirements. Selecting RTUNE and CTUNE according 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 RTUNE and
CTUNE in order to meet 2% output 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.
August 25, 2020
©2016 General Electric Company. All rights reserved.
Page 15
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
Note that if either address resistor value is outside the range
specified in Table 4, the module will respond to address 127.
Digital Feature Descriptions
PMBus Interface Capability
Table 4
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).
Digit
0
1
2
3
4
5
6
7
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.
ADDR1
PMBus Data Format
ADDR0
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:
Data Byte High
7 6 5 4 3
Data Byte Low
2 1 0 7 6 5 4 3 2 1 0
Exponent
MSB
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).
August 25, 2020
RADDR0
RADDR1
SIG_GND
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:
Mantissa
MSB
Resistor Value (KΩ)
10
15.4
23.7
36.5
54.9
84.5
130
200
0
1
:
:
Output is disabled
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:
Bit Position
Access
Function
Default Value
©2016 General Electric Company. All rights reserved.
4
r/w
PU
1
3
r/w
CMD
0
2
r/w
CPR
1
1
r/w
POL
1
0
r
CPA
1
Page 16
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
PU: Sets the default to either operate any time input power is
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.
Bit Value
0
1
Action
Module powers up any time power is present
regardless of state of the analog ON/OFF pin
Module does not power up until commanded
by the analog ON/OFF pin and the OPERATION
command as programmed in bits [2:0] of the
ON_OFF_CONFIG register.
CMD: The CMD bit controls how the device responds to the
OPERATION command.
Bit Value
0
1
Action
Module ignores the ON bit in the OPERATION
command
Module responds to the ON bit in the
OPERATION command
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.
Bit Value
0
1
Action
Module ignores the analog ON/OFF pin, i.e.
ON/OFF is only controlled through the PMBUS
via the OPERATION command
Module requires the analog ON/OFF pin to be
asserted to start the unit
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.
August 25, 2020
Exponent
11100
11100
11100
11100
11100
11100
11100
11100
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 VREF is
nominally set at 600mV, and the output regulation voltage is
then given by
20000 + RTrim
VOUT =
VREF
RTrim
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:
VOUT _ SCALE _ LOOP =
RTrim
20000 + RTrim
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 VREF is what is changed inside the 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
VOUT(offset) = VOUT _ TRIM 2 −10
Table 5
Rise Time
600μs
900μs
1.2ms
1.8ms
2.7ms
4.2ms
6.0ms
9.0ms
Output Voltage Adjustment Using the PMBus
Mantissa
00000001010
00000001110
00000010011
00000011101
00000101011
00001000011
00001100000
00010010000
This offset voltage is added to the voltage set through the
divider ratio and nominal VREF to produce the trimmed output
voltage. The valid range in two’s complement for this command
is –4000h to 3fffh. 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.
©2016 General Electric Company. All rights reserved.
Page 17
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
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.
over temperature fault threshold and/or the warning threshold
have been exceeded.
PMBus Adjustable Output Over and Under Voltage
Protection
(VOUT _ MARGIN _ HIGH + VOUT _ TRIM ) 2 −10
VOUT( ML) =
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:
(VOUT _ MARGIN _ LOW + VOUT _ TRIM ) 2 −10
VOUT(OV _ REQ) = (VOUT _ OV _ FAULT _ LIMIT ) 2 −10
VOUT( MH ) =
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
0101
0110
1001
1010
:
:
:
:
:
Margin Off
Margin Low (Ignore Fault)
Margin Low (Act on Fault)
Margin High (Ignore Fault)
Margin High (Act on Fault)
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.
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). For
production codes after April 2013, the value for
IOUT_OC_WARN_LIMIT will be fixed at 57A. For earlier
production codes the actual value for IOUT_OC_WARN_LIMIT
will vary from module to module due to calibration during
production testing. 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
August 25, 2020
VOUT(UV _ REQ) = (VOUT _ UV _ FAULT _ LIMIT ) 2 −10
2.
3.
4.
Continue operation without interruption (Bits [7:6] =
00, Bits [5:3] = xxx)
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)
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).
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.
©2016 General Electric Company. All rights reserved.
Page 18
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
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.
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 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
VOUT( PGOOD_ ON ) = ( POWER _ GOOD _ ON ) 2 −10
VOUT( PGOOD_ OFF) = ( POWER _ GOOD _ OFF ) 2 −10
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.
August 25, 2020
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 TModule can be estimated using
the following equation
𝑰𝑶𝑼𝑻,𝑪𝑶𝑹𝑹 =
𝑰𝑹𝑬𝑨𝑫_𝑶𝑼𝑻
𝟏 + [(𝑻𝑰𝑵𝑫 − 𝟑𝟎) × 𝟎. 𝟎𝟎𝟑𝟗𝟑]
where IOUT_CORR is the temperature corrected value of the
current measurement, IREAD_OUT is the module current
measurement value, TIND is the temperature of the inductor
winding on the module. Since it may be difficult to measure
TIND, it may be approximated by an estimate of the module
temperature.
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
©2016 General Electric Company. All rights reserved.
Page 19
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
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 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:
VOUT ( Final) =
[VOUT ( Initial) (1 + VOUT _ CAL _ GAIN )]
+ VOUT _ CAL _ OFFSET
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:
VIN ( Final) =
[VIN ( Initial ) (1 + VIN _ CAL _ GAIN )]
+ VIN _ CAL _ OFFSET
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.
Bit Position
7
6
5
4
3
2
1
0
August 25, 2020
Flag
X
OFF
VOUT Overvoltage
IOUT Overcurrent
VIN Undervoltage
Temperature
CML (Comm. Memory Fault)
None of the above
Default Value
0
0
0
0
0
0
0
0
STATUS_WORD: Returns two bytes of information with a
summary of the module’s fault/warning conditions.
Bit Position
7
6
5
4
3
2
1
0
Low Byte
Flag
X
OFF
VOUT Overvoltage
IOUT Overcurrent
VIN Undervoltage
Temperature
CML (Comm. Memory Fault)
None of the above
Default Value
0
0
0
0
0
0
0
0
High Byte
Bit Position
Flag
7
6
5
4
3
2
1
0
VOUT fault or warning
IOUT fault or warning
X
X
POWER_GOOD# (is negated)
X
X
X
Default
Value
0
0
0
0
0
0
0
0
STATUS_VOUT : Returns one byte of information relating to the
status of the module’s output voltage related faults.
Bit Position
Flag
7
6
5
4
3
2
1
0
VOUT OV Fault
X
X
VOUT UV Fault
X
X
X
X
Default
Value
0
0
0
0
0
0
0
0
STATUS_IOUT : Returns one byte of information relating to the
status of the module’s output voltage related faults.
Bit Position
7
6
5
4
3
2
1
0
©2016 General Electric Company. All rights reserved.
Flag
IOUT OC Fault
X
IOUT OC Warning
X
X
X
X
X
Default Value
0
0
0
0
0
0
0
0
Page 20
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
STATUS_TEMPERATURE: Returns one byte of information
relating to the status of the module’s temperature related
faults.
Bit Position
7
6
5
4
3
2
1
0
Flag
OT Fault
OT Warning
X
X
X
X
X
X
Default Value
0
0
0
0
0
0
0
0
STATUS_CML : Returns one byte of information relating to the
status of the module’s communication related faults.
Bit Position
7
6
5
4
3
2
1
0
Flag
Invalid/Unsupported Command
Invalid/Unsupported Command
Packet Error Check Failed
X
X
X
Other Communication Fault
X
Default Value
0
0
0
0
0
0
0
0
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.
Bit Position
7:2
1:0
Low Byte
Flag
Module Name
Reserved
Default Value
000100
10
Bit Position
7:0
1:0
High Byte
Flag
Module Revision Number
Manufacturer ID
Default Value
None
00
August 25, 2020
©2016 General Electric Company. All rights reserved.
Page 21
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
Summary of Supported PMBus Commands
Please refer to the PMBus 1.1 specification for more details of these commands.
Table 6
Hex
Code
Command
Non-Volatile
Memory Storage
Brief Description
Turn Module on or off. Also used to margin the output voltage
01
OPERATION
Format
Bit Position
Access
Function
Default Value
7
r/w
On
0
6
r
X
0
5
r/w
0
Unsigned Binary
4
3
2
r/w
r/w
r/w
Margin
0
0
0
1
r
X
X
0
r
X
X
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/w
r/w
r/w
r
Function
X
X
X
pu
cmd
cpr
pol
cpa
Default Value
0
0
0
1
0
1
1
1
YES
Clear any fault bits that may have been set, also releases the SMBALERT# signal if the
device has been asserting it.
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
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)
Copies all current register settings in the module into non-volatile memory (EEPROM)
on the module. Takes about 50ms for the command to execute.
YES
02
ON_OFF_CONFIG
03
CLEAR_FAULTS
10
WRITE_PROTECT
11
STORE_DEFAULT_ALL
12
RESTORE_DEFAULT_ALL
Restores all current register settings in the module from values in the module nonvolatile memory (EEPROM)
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
13
14
RESTORE_DEFAULT_CODE
20
August 25, 2020
VOUT_MODE
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
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
©2016 General Electric Company. All rights reserved.
Page 22
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
Table 6 (continued)
Hex
Code
Command
22
VOUT_TRIM
25
VOUT_MARGIN_HIGH
26
29
VOUT_MARGIN_LOW
VOUT_SCALE_LOOP
35
August 25, 2020
VIN_ON
Non-Volatile
Memory Storage
Brief Description
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
r
r/w
r/w
r/w
r/w
r/w
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
r/w
r/w
r/w
r/w
r/w
r/w
r/w
Function
Low Byte
Default Value
0
0
0
0
0
0
0
0
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
r/w
r/w
r/w
r/w
r/w
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
r/w
r/w
r/w
r/w
r/w
r/w
r/w
Function
Low Byte
Default Value
0
1
0
0
0
1
1
1
Sets the target voltage for margining the output low. Exponent is fixed at
Format
Linear, two’s complement binary
Bit Position
7
6
5
4
3
2
1
Access
r
r/w
r/w
r/w
r/w
r/w
r/w
Function
High Byte
Default Value
0
0
0
0
0
1
0
Bit Position
7
6
5
4
3
2
1
Access
r/w
r/w
r/w
r/w
r/w
r/w
r/w
Function
Low Byte
Default Value
0
1
0
1
0
0
0
YES
YES
-10
0
r/w
0
0
r/w
YES
1
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
r/w
r/w
r/w
r/w
r/w
r/w
r/w
Function
Mantissa
Default Value
0
0
0
0
0
0
0
0
YES
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
r/w
r/w
r/w
r/w
r/w
r/w
Function
Mantissa
Default Value
0
0
0
0
1
1
1
0
YES
©2016 General Electric Company. All rights reserved.
Page 23
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
Table 6 (continued)
Hex
Code
Command
36
VIN_OFF
38
IOUT_CAL_GAIN
39
IOUT_CAL_OFFSET
40
VOUT_OV_FAULT_LIMIT
41
VOUT_OV_FAULT_RESPONSE
August 25, 2020
Brief Description
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
r/w
r/w
r/w
r/w
r/w
r/w
Function
Mantissa
Default Value
0
0
0
0
1
1
0
0
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
r/w
r/w
r/w
r/w
r/w
r/w
r/w
Function
Mantissa
Default Value
V: Variable based on factory calibration
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
r/w
r/w
r/w
r/w
Function
Mantissa
Default Value
V: Variable based on factory calibration
Sets the voltage level for an output overvoltage fault. Exponent is fixed at -10.
Suggested value shown for 1.2Vo. Should be changed for different output voltage.
Values can be 108%, 110%, 112% or 115% of output voltage
Format
Linear, two’s complement binary
Bit Position
7
6
5
4
3
2
1
0
Access
r
r/w
r/w
r/w
r/w
r/w
r/w
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
r/w
r/w
r/w
r/w
r/w
r/w
r/w
Function
Low Byte
Default Value
0
1
1
0
0
0
0
0
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/w
r/w
r/w
r
r
r
RSP
RSP
Function
RS[2] RS[1] RS[0]
X
X
X
[1]
[0]
Default Value
1
1
1
1
1
1
0
0
©2016 General Electric Company. All rights reserved.
Non-Volatile
Memory Storage
YES
YES
YES
YES
YES
Page 24
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
Table 6 (continued)
Hex
Code
Command
44
VOUT_UV_FAULT_LIMIT
45
VOUT_UV_FAULT_RESPONSE
46
4A
5E
Non-Volatile
Memory Storage
Brief Description
Sets the voltage level for an output undervoltage fault. Exponent is fixed at -10.
Suggested value shown for 1.2Vo. Should be changed for different output voltage.
Values can be 92%, 90%, 88% or 85% of output voltage
Format
Linear, two’s complement binary
Bit Position
7
6
5
4
3
2
1
0
Access
r
r/w
r/w
r/w
r/w
r/w
r/w
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
r/w
r/w
r/w
r/w
r/w
r/w
r/w
Function
Low Byte
Default Value
0
0
1
1
1
0
0
1
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/w
r/w
r/w
r
r
r
RSP
RSP
Function
RS[2] RS[1] RS[0]
X
X
X
[1]
[0]
Default Value
0
0
0
0
0
1
0
0
YES
YES
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
Access
r
r
r
r
r
r
r
Function
Exponent
Mantissa
Default Value
1
1
1
1
1
0
0
Bit Position
7
6
5
4
3
2
1
Access
r
r
r
r
r
r
r
Function
Mantissa
Default Value
0
1
1
1
0
1
0
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
r/w
r/w
r/w
r/w
r/w
r/w
Function
Mantissa
Default Value
0
1
1
1
0
0
1
0
YES
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
r/w
r/w
r/w
r/w
r/w
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
r/w
r/w
r/w
r/w
r/w
r/w
r/w
Function
Low Byte
Default Value
0
1
1
0
1
0
1
0
YES
POWER_GOOD_ON
August 25, 2020
©2016 General Electric Company. All rights reserved.
0
r
0
0
r
YES
0
Page 25
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
Table 6 (continued)
Hex
Code
5F
61
78
79
7A
7B
Command
Brief Description
Non-Volatile
Memory Storage
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
r/w
r/w
r/w
r/w
r/w
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
r/w
r/w
r/w
r/w
r/w
r/w
r/w
Function
Low Byte
Default Value
0
1
0
1
0
0
1
0
YES
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
r/w
r/w
r/w
r/w
r/w
r/w
r/w
Function
Mantissa
Default Value
0
0
1
0
1
0
1
1
YES
TON_RISE
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
VOUT IOUT_
OTHE
Flag
X
OFF
VIN_UV TEMP CML
_OV
OC
R
Default Value
0
0
0
0
0
0
0
0
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
IOUT_
Flag
VOUT
X
X
PGOOD
X
X
X
OC
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
VOUT IOUT_
OTHE
Flag
X OFF
VIN_UV TEMP CML
_OV
OC
R
Default Value
0
0
0
0
0
0
0
0
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
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
August 25, 2020
©2016 General Electric Company. All rights reserved.
Page 26
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
Table 6 (continued)
Hex
Code
7D
Command
STATUS_TEMPERATURE
7E
STATUS_CML
88
READ_VIN
8B
8C
98
August 25, 2020
Non-Volatile
Memory Storage
Brief Description
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
0
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
Other
Invalid
Invalid PEC
Flag
X
X
X
Comm
X
Command Data Fail
Fault
Default Value
0
0
0
0
0
0
0
0
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
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
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
Access
r
r
r
r
r
r
r
Function
Exponent
Mantissa
Default Value
1
1
1
0
0
0
0
Bit Position
7
6
5
4
3
2
1
Access
r
r
r
r
r
r
r
Function
Mantissa
Default Value
0
0
0
0
0
0
0
PMBUS_REVISION
0
r
0
0
r
0
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
©2016 General Electric Company. All rights reserved.
YES
Page 27
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
Table 6 (continued)
Hex
Code
A0
Command
MFR_VIN_MIN
A4
MFR_VOUT_MIN
D0
MFR_SPECIFIC_00
D4
VOUT_CAL_OFFSET
D5
VOUT_CAL_GAIN
August 25, 2020
Brief Description
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
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
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
1
0
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
r/w
r/w
r/w
r/w
r/w
r/w
r/w
Function
Mantissa
Default Value
V
V
V
V
V
V
V
V
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/w
r
r
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
r
r
r/w
r/w
r/w
r/w
r/w
Function
Mantissa
Default Value
V
V
V
V
V
V
V
V
©2016 General Electric Company. All rights reserved.
Non-Volatile
Memory Storage
YES
YES
YES
YES
YES
Page 28
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
TTable 6 (continued)
Hex
Code
D6
D7
Command
Brief Description
Non-Volatile
Memory Storage
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
r/w
r
r
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
r/w
r/w
r/w
r/w
Function
Mantissa
Default Value
0
0
V
V
V
V
V
V
YES
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
r/w
r
r
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
r/w
r/w
r/w
r/w
Function
Mantissa
Default Value
0
0
0
V
V
V
V
V
YES
VIN_CAL_GAIN
August 25, 2020
©2016 General Electric Company. All rights reserved.
Page 29
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
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.
The thermal reference points, Tref used in the specifications are
also shown in Figure 30. For reliable operation the
temperatures at these points should not exceed 120ºC. 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.
25.4_
(1.0)
Wind Tunnel
PWBs
Power Module
76.2_
(3.0)
x
12.7_
(0.50)
Probe Location
for measuring
airflow and
ambient
temperature
Air
flow
Figure 31. Preferred airflow direction and location of hotspot of the module (Tref).
Figure 30. Thermal Test Setup.
August 25, 2020
©2016 General Electric Company. All rights reserved.
Page 30
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
Shock and Vibration
The ruggedized (-D version) of the modules are designed to withstand elevated levels of shock and vibration to be able to operate in
harsh environments. The ruggedized modules have been successfully tested to the following conditions:
Non operating random vibration:
Random vibration tests conducted at 25C, 10 to 2000Hz, for 30 minutes each level, starting from 30Grms (Z axis) and up to 50Grms (Z
axis). The units were then subjected to two more tests of 50Grms at 30 minutes each for a total of 90 minutes.
Operating shock to 40G per Mil Std. 810G, Method 516.4 Procedure I:
The modules were tested in opposing directions along each of three orthogonal axes, with waveform and amplitude of the shock
impulse characteristics as follows:
All shocks were half sine pulses, 11 milliseconds (ms) in duration in all 3 axes.
Units were tested to the Functional Shock Test of MIL-STD-810, Method 516.4, Procedure I - Figure 516.4-4. A shock magnitude of 40G
was utilized. The operational units were subjected to three shocks in each direction along three axes for a total of eighteen shocks.
Operating vibration per Mil Std 810G, Method 514.5 Procedure I:
The ruggedized (-D version) modules are designed and tested to vibration levels as outlined in MIL-STD-810G, Method 514.5, and
Procedure 1, using the Power Spectral Density (PSD) profiles as shown in Table 1 and Table 2 for all axes. Full compliance with
performance specifications was required during the performance test. No damage was allowed to the module and full compliance to
performance specifications was required when the endurance environment was removed. The module was tested per MIL-STD-810,
Method 514.5, Procedure I, for functional (performance) and endurance random vibration using the performance and endurance
levels shown in Table 4 and Table 5 for all axes. The performance test has been split, with one half accomplished before the endurance
test and one half after the endurance test (in each axis). The duration of the performance test was at least 16 minutes total per axis
and at least 120 minutes total per axis for the endurance test. The endurance test period was 2 hours minimum per axis.
Frequency (Hz)
10
30
40
50
90
110
130
140
Frequency (Hz)
10
30
40
50
90
110
130
140
August 25, 2020
Table 4: Performance Vibration Qualification - All Axes
PSD Level
PSD Level
Frequency (Hz)
Frequency (Hz)
(G2/Hz)
(G2/Hz)
1.14E-03
170
2.54E-03
690
5.96E-03
230
3.70E-03
800
9.53E-04
290
7.99E-04
890
2.08E-03
340
1.12E-02
1070
2.08E-03
370
1.12E-02
1240
7.05E-04
430
8.84E-04
1550
5.00E-03
490
1.54E-03
1780
8.20E-04
560
5.62E-04
2000
Table 5: Endurance Vibration Qualification - All Axes
PSD Level
PSD Level
Frequency (Hz)
Frequency (Hz)
(G2/Hz)
(G2/Hz)
0.00803
170
0.01795
690
0.04216
230
0.02616
800
0.00674
290
0.00565
890
0.01468
340
0.07901
1070
0.01468
370
0.07901
1240
0.00498
430
0.00625
1550
0.03536
490
0.01086
1780
0.0058
560
0.00398
2000
©2016 General Electric Company. All rights reserved.
PSD Level
(G2/Hz)
1.03E-03
7.29E-03
1.00E-03
2.67E-03
1.08E-03
2.54E-03
2.88E-03
5.62E-04
PSD Level
(G2/Hz)
0.00727
0.05155
0.00709
0.01887
0.00764
0.01795
0.02035
0.00398
Page 31
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
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)
Vin+
Vout+
VIN
VOUT
VS+
PGOOD
RTUNE
MODULE
SEQ
CTUNE
CLK
CI3
CI2
CI1
TRIM
DATA
CO3
RTrim
ADDR1
ON/OFF
GND
CO2
ADDR0
SMBALRT#
SHARE
CO1
RADDR1
RADDR0
SIG_GND
SYNC GND
VS-
CI1
Decoupling cap - 1x0.01F/16V ceramic capacitor (e.g. Murata LLL185R71E103MA01)
CI2
3x22F/16V ceramic capacitor (e.g. Murata GRM32ER61C226KE20)
CI3
470F/16V bulk electrolytic
CO1
Decoupling cap - 1x0.01F/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.
August 25, 2020
©2016 General Electric Company. All rights reserved.
Page 32
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
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.)
SIDE VIEW
3
4
5
7
6
9
14
13
12
11
10
15
8
2
16
FUNCTION
PIN
FUNCTION
1
ON/OFF
11
SIG_GND
2
VIN
12
VS-
3
SEQ
13
CLK
4
GND
14
DATA
5
6
7
VOUT
TRIM
VS+
15
16
17
SYNC
PG
SMBALERT#
8
GND
18
ADDRESS 0
9
SHARE
19
ADDRESS 1
10
GND
August 25, 2020
17
18
19
BOTTOM VIEW
1
©2016 General Electric Company. All rights reserved.
Page 33
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
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.)
PIN
1
2
3
4
5
6
7
8
9
10
August 25, 2020
FUNCTION
ON/OFF
VIN
SEQ
GND
VOUT
TRIM
VS+
GND
SHARE
GND
PIN
11
12
13
14
15
16
17
18
19
FUNCTION
SIG_GND
VSCLK
DATA
SYNC
PG
SMBALERT#
ADDRESS 0
ADDRESS 1
©2016 General Electric Company. All rights reserved.
Page 34
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
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”)
August 25, 2020
©2016 General Electric Company. All rights reserved.
Page 35
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
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.
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 JSTD-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.
300
Per J-STD-020 Rev. C
Peak Temp 260°C
250
Reflow Temp (°C)
Surface Mount Information
200
* Min. Time Above 235°C
15 Seconds
150
Heating Zone
1°C/Second
Cooling
Zone
*Time Above 217°C
60 Seconds
100
50
0
Reflow Time (Seconds)
Figure 32. Recommended linear reflow profile using
Sn/Ag/Cu solder.
Post Solder Cleaning and Drying Considerations
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.
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
August 25, 2020
©2016 General Electric Company. All rights reserved.
Page 36
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
Ordering Information
Please contact your GE Sales Representative for pricing, availability and optional features.
Table 7. Device Codes
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
150022587
-Z refers to RoHS compliant parts
Table 8. Coding Scheme
Package
Remote
Input voltage Output Output On/Off
Identifie Family
Sense
range
current voltage logic
r
3
M
D
T
040A0
X
4
P=Pico D=Dlynx
T=with
40A
X=
4=
3=
Digital
EZ_Sequence
progra positive Remote
U=Micro
mmable
Sense
V=DLynx
X=without
output
No
M=Mega Analog.
sequencing
entry =
negativ
G=Giga
e
ROHS
Complia
nce
Options
-SR
S=
Surface
Mount
-P
Paralleling
-H
2 Extra
Ground
Pins
R = Tape
& Reel
-D
Z
D = 105°C
operating
ambient,
40G
operating
shock as
per MIL
Std 810G
Z=
ROHS6
ABB Power Electronics Inc.’s digital non-isolated DC-DC products may be covered by one or more of the following patents licensed from Bel Power Solutions, Inc.: 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 Bel Power Solutions, Inc. 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
Contact Us
For more information, call us at
USA/Canada:
+1 888 546 3243, or +1 972 244 9288
Asia-Pacific:
+86-21-53899666
Europe, Middle-East and Africa:
+49.89.878067-280
Go.ABB/Industrial
GE Critical Power reserves the right to make changes to the product(s) or information contained herein without notice, and no
liability is assumed as a result of their use or application. No rights under any patent accompany the sale of any such product(s) or
information.
August 25, 2020
©2016 General Electric Company. All International rights reserved.
Version 1_7
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