GE
Data Sheet
35A Digital MicroDLynxIITM: Non-Isolated DC-DC Power Modules
4.5Vdc –14.4Vdc input; 0.51Vdc to 3.63Vdc output; 35A Output Current
Features
▪
Compliant to RoHS Directive 2011/65/EU and amended
Directive (EU) 2015/863.
▪
Compatible in a Pb-free or SnPb reflow environment (Z
versions)
▪
Compliant to IPC- 9592 (September 2008), Category 2,
Class I
▪
Compliant to REACH Directive (EC) No 1907/2006
▪
DOSA based
▪
Wide Input voltage range (4.5Vdc-14.4Vdc)
▪
Output voltage programmable from 0.51Vdc to 3.63Vdc via
external resistor and PMBusTM #
▪
Digital interface through the PMBusTM # protocol
Applications
▪
Tunable LoopTM to optimize dynamic output voltage
response
▪
Distributed power architectures
▪
Flexible output voltage sequencing EZ-SEQUENCE
▪
Intermediate bus voltage applications
▪
Power Good signal
▪
Telecommunications equipment
▪
▪
Servers and storage applications
Fixed switching frequency with capability of external
synchronization
▪
Networking equipment
▪
Output over current protection (non-latching)
▪
▪
Over temperature protection
Industrial equipment
▪
Remote On/Off
▪
Ability to sink and source current
▪
Cost efficient open frame design
▪
Small size: 20.32 mm x 11.45 mm x 11 mm (0.8 in x 0.45 in
x 0.433 in)
▪
Wide operating temperature range [-40°C to 85°C]
▪
ANSI/UL* 62368-1 and CAN/CSA† C22.2 No. 62368-1
Recognized, DIN VDE‡ 0868-1/A11:2017 (EN623681:2014/A11:2017)
RoHS Compliant
Vin+
VIN
PGOOD
Vout+
VOUT
VS+
RTUNE
MODULE
SEQ
Cin
CTUNE
CLK
TRIM
DATA
ADDR0
SMBALRT#
ADDR1
ON/OFF
GND
SYNC
SIG_GND
GND VS-
Co
RTrim
RADDR1
RADDR0
▪
ISO** 9001 and ISO 14001 certified manufacturing facilities
Description
The 35A Digital MicroDLynxIITM power modules are non-isolated dc-dc converters that can deliver up to 35A 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 0.51Vdc to 3.63Vdc, programmable via an external resistor and PMBusTM control. Features include a digital interface using
the PMBusTM protocol, remote On/Off, adjustable output voltage, over current and over temperature protection. The PMBus TM #
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)
September 11, 2020
©2017 General Electric Company. All rights reserved.
GE
Data Sheet
35A Digital MicroDLynxIITM: Non-Isolated DC-DC Power Modules
4.5Vdc –14.4Vdc input; 0.51Vdc to 3.63Vdc output; 35A 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
Input Voltage
Device
Symbol
Min
Max
Unit
All
VIN
-0.3
15
V
7
V
-0.3
3.6
V
Continuous
VS, ON/OFF, SEQ
All
CLK, DATA, SMBALERT#,SYNC
All
Operating Ambient Temperature
All
TA
-40
85
°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
Operating Input Voltage
All
VIN
4.5
Maximum Input Current
All
IIN,max
Typ
Max
Unit
14.4
Vdc
33
Adc
(VIN=4.5V to 14V, IO=IO, max )
VO,set = 0.6
Vdc
VO,set =
3.63Vdc
IIN,No load
43
mA
IIN,No load
106
mA
All
IIN,stand-by
16
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
35
mAp-p
Input Ripple Rejection (120Hz)
All
-71
dB
Input No Load Current
(VIN = 12Vdc, IO = 0, module enabled)
Input Stand-by Current
(VIN = 12Vdc, module disabled)
1
A2s
Output Voltage Set-point accuracy over entire output range
0 to 85°C, Vo=over entire range
All
VO, set
-0.5
+0.5
% VO, set
-40 to 85°C, Vo=over entire range
All
VO, set
-1
+1
% VO, set
Regulation1
Voltage
Line Regulation
Load (IO=IO, min to IO, max) Regulation
1
(VIN=VIN, min to
VIN, max)
3
mV
All
5
mV
Worst case Line and load regulation data, all temperatures, from design verification testing as per IPC9592.
September 11, 2020
©2017 General Electric Company. All rights reserved.
Page 2
GE
Data Sheet
35A Digital MicroDLynxIITM: Non-Isolated DC-DC Power Modules
4.5Vdc –14.4Vdc input; 0.51Vdc to 3.63Vdc output; 35A Output Current
Electrical Specifications (continued)
Parameter
Device
Symbol
Min
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
-15
PMBus Output Voltage Adjustment Step Size
All
Remote Sense Range
All
Output Ripple and Noise on nominal output
(VIN=VIN, nom and IO=IO, min to IO, max Co = 0.1μF // 8x47 μF
ceramic capacitors)
Peak-to-Peak (5Hz to 20MHz bandwidth)
All
17
mVpk-pk
All
3.2
mVrms
RMS (5Hz to 20MHz bandwidth)
Typ
0
Max
Unit
3.63
Vdc
+10
%VO,set
0.4
%VO,set
0.5
Vdc
2
External Capacitance
Without the Tunable LoopTM
ESR ≥ 1 mΩ
All
CO, max
8x47
16x47
μF
ESR ≥ 0.15 mΩ
All
CO, max
8x47
7000
μF
ESR ≥ 10 mΩ
All
CO, max
8x47
8500
μF
0
352
Adc
With the Tunable LoopTM
Output Current (in either sink or source mode)
All
Io
Output Current Limit Inception (Hiccup Mode)
(current limit does not operate in sink mode)
All
IO, lim
41
Output Short-Circuit Current
All
IO, s/c
18
Arms
VO,set = 0.6Vdc
η
80.2%
%
VIN= 12Vdc, TA=25°C
VO, set = 1.2Vdc
η
87.8%
%
IO=IO, max , VO= VO,set
VO,set = 1.8Vdc
η
91.4%
%
VO,set = 2.5Vdc
η
93.2%
%
VO,set = 3.3Vdc
η
94.3%
%
All
fsw
500
kHz
3
Adcmax
(VO≤250mV) ( Hiccup Mode )
Efficiency
Switching Frequency
2 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.
3 For
ambient temperatures lower that -20C the minimum OCP is 30A. Monotonic start-up is guaranteed for output current 30A and below.
September 11, 2020
©2017 General Electric Company. All rights reserved.
Page 3
GE
Data Sheet
35A Digital MicroDLynxIITM: Non-Isolated DC-DC Power Modules
4.5Vdc –14.4Vdc input; 0.51Vdc to 3.63Vdc output; 35A Output Current
Electrical Specifications (continued)
Parameter
Device
Frequency Synchronization
Symbol
Min
Typ
Max
Unit
950
1000
1050
kHz
All
Synchronization Frequency Range (2 x fswitch)
All
High-Level Input Voltage
All
VIH
Low-Level Input Voltage
All
VIL
Minimum Pulse Width, SYNC
All
tSYNC
Maximum SYNC rise time
All
tSYNC_SH
Device
Min
2
V
0.4
100
V
ns
100
ns
Max
Unit
General Specifications
Parameter
Calculated MTBF (IO=0.8IO, max, TA=40°C) Telecordia Issue 2
Method 1 Case 3
All
Typ
66,823,110
Hours
7.3
g (oz.)
Weight
Feature Specifications
Unless otherwise indicated, specifications apply overall operating input voltage, resistive load, and temperature conditions. See
Feature Descriptions for additional information.
Parameter
Device
Symbol
Min
Typ
Max
Unit
17
uA
7
V
2
uA
0.8
V
3
mA
7
Vdc
On/Off Signal Interface
(VIN=VIN, min to VIN, max ; open collector or equivalent,
Signal referenced to GND)
Device code with suffix “4” – Positive Logic (See Ordering
Information)
Logic High (Module ON)
Input High Current
All
IIH
Input High Voltage
All
VIH
Input Low Current
All
IIL
Input Low Voltage
All
VIL
Input High Current
All
IIH
Input High Voltage
All
VIH
2.1
Logic Low (Module OFF)
-0.2
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)
2.1
Logic Low (Module ON)
Input low Current
All
IIL
Input Low Voltage
All
VIL
September 11, 2020
©2017 General Electric Company. All rights reserved.
0
500
μA
0.8
Vdc
Page 4
GE
Data Sheet
35A Digital MicroDLynxIITM: Non-Isolated DC-DC Power Modules
4.5Vdc –14.4Vdc input; 0.51Vdc to 3.63Vdc output; 35A Output Current
Feature Specifications (cont.)
Parameter
Device
Symbol
Min
Typ
Max
Units
All
Tdelay
1.2
msec
All
Tdelay
1.1
msec
All
Trise
2.7
msec
Turn-On Delay and Rise Times
(VIN=VIN, nom, IO=IO, max , VO to within ±1% of steady state)
Case 1: On/Off input is enabled and then input power is
applied (delay from instant at which VIN = VIN, min until Vo =
10% of Vo, set)
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)
Output voltage Rise time (time for Vo to rise from
10% of Vo, set to 90% of Vo, set)
Output voltage overshoot (TA = 25oC
VIN= VIN, min to VIN, max,IO = IO, min to IO, max)
With or without maximum external capacitance
Over Temperature Protection
(See Thermal Considerations section)
3.0
% VO, set
All
TOT
122
°C
PMBus Over Temperature Warning Threshold *
All
TWARN
105
°C
Tracking Accuracy
(Power-Up: 2V/ms)
All
VSEQ –Vo
100
mV
(Power-Down: 2V/ms)
All
VSEQ –Vo
200
mV
(VIN, min to VIN, max; IO, min to IO, max 0V < VSEQ < Vo)
Input Undervoltage Lockout
Turn-on Threshold
All
4.25
Vdc
Turn-off Threshold
All
4.05
Vdc
Hysteresis
All
0.2
Vdc
PMBus Adjustable Input Under Voltage Lockout Thresholds
All
4
Resolution of Adjustable Input Under Voltage Threshold
All
250
14
Vdc
mV
PGOOD (Power Good)
Signal Interface Open Drain, Vsupply 5VDC
Overvoltage threshold for PGOOD ON
All
108.33
%VO, set
Overvoltage threshold for PGOOD OFF
All
112.5
%VO, set
Undervoltage threshold for PGOOD ON
All
91.67
%VO, set
Undervoltage threshold for PGOOD OFF
All
87.5
Pulldown resistance of PGOOD pin
All
40
Sink current capability into PGOOD pin
All
%VO, set
70
5
mA
* Over temperature Warning – Warning may not activate before alarm and unit may shutdown before warning
September 11, 2020
©2017 General Electric Company. All rights reserved.
Page 5
GE
Data Sheet
35A Digital MicroDLynxIITM: Non-Isolated DC-DC Power Modules
4.5Vdc –14.4Vdc input; 0.51Vdc to 3.63Vdc output; 35A 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
-10
IIL
-10
Typ
Max
Unit
3.6
V
PMBus Signal Interface Characteristics
Input low level current (CLK, DATA)
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
0.8
V
10
μA
10
μA
0.4
V
10
μA
0.7
pF
FPMB
10
tHD:DAT
0
300
ns
tSU:DAT
250
ns
Output current measurement range
IRNG
0
50
A
Output current measurement accuracy -40 to 85°C
IACC
-7
5
%
Receive Mode
Transmit Mode
Data hold time
Data setup time
400
kHz
Measurement System Characteristics
Temperature measurement accuracy @12Vin, 0°C to 85°C
TACC
±5*
°C
VOUT measurement range
VOUT(rng)
0
4
V
VOUT measurement accuracy
VOUT, ACC
-2
2
%
*Accuracy as per PWM Controller Datasheet
September 11, 2020
©2017 General Electric Company. All rights reserved.
Page 6
GE
Data Sheet
35A Digital MicroDLynxIITM: Non-Isolated DC-DC Power Modules
4.5Vdc –14.4Vdc input; 0.51Vdc to 3.63Vdc output; 35A Output Current
Characteristic Curves
EFFICIENCY, (%)
OUTPUT CURRENT, Io (A)
The following figures provide typical characteristics for the 35A Digital MicroDLynxIITM at 0.6Vo and 25oC.
AMBIENT TEMPERATURE, TA OC
OUTPUT CURRENT, IO (A)
VO (V) (10mV/div)
IO (A) (10Adiv)
OUTPUT OLTAGE
Figure 2. Derating Output Current versus Ambient Temperature and
Airflow.
OUTPUT CURRENT,
VO (V) (10mV/div)
OUTPUT VOLTAGE
Figure 1. Converter Efficiency versus Output Current.
TIME, t (1s/div)
TIME, t (20s /div)
INPUT VOLTAGE
VIN (V) (10V/div)
VO (V) (200mV/div)
VON/OFF (V) (5V/div)
VO (V) (200mV/div)
OUTPUT VOLTAGE
ON/OFF VOLTAGE
OUTPUT VOLTAGE
Figure 3. Typical output ripple (CO=8x47μF ceramic, VIN = 12V, Io = Figure 4. Transient Response to Dynamic Load Change from 50% to
Io,max, ).
100% at 12Vin, Cout=8x47uF+24x330uF, CTune=18nF, RTune=300Ω
TIME, t (2ms/div)
TIME, t (2ms/div)
Figure 5. Typical Start-up Using On/Off Voltage (Io = Io,max).
September 11, 2020
Figure 6. Typical Start-up Using Input Voltage (VIN = 12V, Io = Io,max).
©2017 General Electric Company. All rights reserved.
Page 7
GE
Data Sheet
35A Digital MicroDLynxIITM: Non-Isolated DC-DC Power Modules
4.5Vdc –14.4Vdc input; 0.51Vdc to 3.63Vdc output; 35A Output Current
Characteristic Curves
EFFICIENCY, (%)
OUTPUT CURRENT, Io (A)
The following figures provide typical characteristics for the 35A Digital MicroDLynxIITM at 1.2Vo and 25oC.
AMBIENT TEMPERATURE, TA OC
OUTPUT CURRENT, IO (A)
OUTPUT VOLTAGE
VO (V) (20mV/div)
IO (A) (10Adiv)
Figure 8. Derating Output Current versus Ambient Temperature and
Airflow.
OUTPUT CURRENT,
VO (V) (10mV/div)
OUTPUT VOLTAGE
Figure 7. Converter Efficiency versus Output Current.
TIME, t (1s/div)
TIME, t (20s /div)
VIN (V) (10V/div)
INPUT VOLTAGE
OUTPUT VOLTAGE
VON/OFF (V) (5V/div)
VO (V) (500mV/div)
ON/OFF VOLTAGE
OUTPUT VOLTAGE
VO (V) (500mV/div)
Figure 9. Typical output ripple (CO=8x47μF ceramic, VIN = 12V, Io = Figure 10. Transient Response to Dynamic Load Change from 50% to
Io,max, ).
100% at 12Vin, Cout=8x47uF+14x330uF, CTune=10nF, RTune=300Ω
TIME, t (2ms/div)
Figure 11. Typical Start-up Using On/Off Voltage (Io = Io,max).
September 11, 2020
TIME, t (2ms/div)
Figure 12. Typical Start-up Using Input Voltage (VIN = 12V, Io = Io,max).
©2017 General Electric Company. All rights reserved.
Page 8
GE
Data Sheet
35A Digital MicroDLynxIITM: Non-Isolated DC-DC Power Modules
4.5Vdc –14.4Vdc input; 0.51Vdc to 3.63Vdc output; 35A Output Current
Characteristic Curves
EFFICIENCY, (%)
OUTPUT CURRENT, Io (A)
The following figures provide typical characteristics for the 35A Digital MicroDLynxIITM at 1.8Vo and 25oC.
AMBIENT TEMPERATURE, TA OC
OUTPUT CURRENT, IO (A)
OUTPUT VOLTAGE
VO (V) (20mV/div)
IO (A) (10Adiv)
Figure 14. Derating Output Current versus Ambient Temperature
and Airflow.
OUTPUT CURRENT,
VO (V) (10mV/div)
OUTPUT VOLTAGE
Figure 13. Converter Efficiency versus Output Current.
TIME, t (1s/div)
TIME, t (20s /div)
INPUT VOLTAGE
VIN (V) (10V/div)
OUTPUT VOLTAGE
VON/OFF (V) 5V/div)
VO (V) (1V/div)
ON/OFF VOLTAGE
OUTPUT VOLTAGE
VO (V) (1V/div)
Figure 15. Typical output ripple and noise (CO=8x47μF ceramic, VIN Figure 16. Transient Response to Dynamic Load Change from 50% to
= 12V, Io = Io,max, ).
100% at 12Vin, Cout=8x47uF+7x330uF, CTune=4.7nF, RTune=221Ω
TIME, t (2ms/div)
Figure 17. Typical Start-up Using On/Off Voltage (Io = Io,max).
September 11, 2020
TIME, t (2ms/div)
Figure 18. Typical Start-up Using Input Voltage (VIN = 12V, Io = Io,max).
©2017 General Electric Company. All rights reserved.
Page 9
GE
Data Sheet
35A Digital MicroDLynxIITM: Non-Isolated DC-DC Power Modules
4.5Vdc –14.4Vdc input; 0.51Vdc to 3.63Vdc output; 35A Output Current
Characteristic Curves
EFFICIENCY, (%)
OUTPUT CURRENT, Io (A)
The following figures provide typical characteristics for the 35A Digital MicroDLynxIITM at 2.5Vo and 25oC.
AMBIENT TEMPERATURE, TA OC
OUTPUT CURRENT, IO (A)
VO (V) (50mV/div)
IO (A) (10Adiv)
OUTPUT VOLTAGE
Figure 20. Derating Output Current versus Ambient Temperature
and Airflow.
OUTPUT CURRENT,
VO (V) (10mV/div)
OUTPUT VOLTAGE
Figure 19. Converter Efficiency versus Output Current.
TIME, t (1s/div)
TIME, t (20s /div)
INPUT VOLTAGE
VIN (V) (10V/div)
OUTPUT VOLTAGE
VON/OFF (V) (5V/div)
VO (V) (1V/div)
VO (V) (1V/div)
ON/OFF VOLTAGE
OUTPUT VOLTAGE
Figure 21. Typical output ripple and noise (CO=8x47μF ceramic, VIN Figure 22. Transient Response to Dynamic Load Change from 50% to
= 12V, Io = Io,max, ).
100% at 12Vin, Cout=8x47uF+4x330uF, CTune=3300pF, RTune=221Ω
TIME, t (2ms/div)
Figure 23. Typical Start-up Using On/Off Voltage (Io = Io,max).
September 11, 2020
TIME, t (2ms/div)
Figure 24. Typical Start-up Using Input Voltage (VIN = 12V, Io = Io,max).
©2017 General Electric Company. All rights reserved.
Page 10
GE
Data Sheet
35A Digital MicroDLynxIITM: Non-Isolated DC-DC Power Modules
4.5Vdc –14.4Vdc input; 0.51Vdc to 3.63Vdc output; 35A Output Current
Characteristic Curves
EFFICIENCY, (%)
OUTPUT CURRENT, Io (A)
The following figures provide typical characteristics for the 35A Digital MicroDLynxIITM at 3.3Vo and 25oC.
AMBIENT TEMPERATURE, TA OC
OUTPUT CURRENT, IO (A)
OUTPUT VOLTAGE
VO (V) (50mV/div)
IO (A) (10Adiv)
Figure 26. Derating Output Current versus Ambient Temperature
and Airflow.
OUTPUT CURRENT,
VO (V) (20mV/div)
OUTPUT VOLTAGE
Figure 25. Converter Efficiency versus Output Current.
TIME, t (1s/div)
TIME, t (20s /div)
INPUT VOLTAGE
VIN (V) (10V/div)
VO (V) (1V/div)
VON/OFF (V) (5V/div)
VO (V) (1V/div)
OUTPUT VOLTAGE
ON/OFF VOLTAGE
OUTPUT VOLTAGE
Figure 27. Typical output ripple and noise (CO=7x22μF ceramic, VIN Figure 28 Transient Response to Dynamic Load Change from 50% to
= 12V, Io = Io,max, ).
100% at 12Vin, Cout=8x47uF+2x330uF, CTune=2700pF, RTune=221Ω
TIME, t (2ms/div)
Figure 29. Typical Start-up Using On/Off Voltage (Io = Io,max).
September 11, 2020
TIME, t (2ms/div)
Figure 30. Typical Start-up Using Input Voltage (VIN = 12V, Io = Io,max).
©2017 General Electric Company. All rights reserved.
Page 11
GE
Data Sheet
35A Digital MicroDLynxIITM: Non-Isolated DC-DC Power Modules
4.5Vdc –14.4Vdc input; 0.51Vdc to 3.63Vdc output; 35A Output Current
Design Considerations
40
8x47uF Ext Cap
Input Filtering
10x47uF Ext Cap
To minimize input voltage ripple, ceramic capacitors are
recommended at the input of the module. Figure 31 shows
the input ripple voltage for various output voltages at 35A
of load current with 4x22 µF, 6x22 µF or 8x22 µF ceramic
capacitors and an input of 12V.
30
Output Ripple (mVp-p)
The 35A Digital MicroDLynxIITM 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.
20
10
0
Input Ripple Voltage (mVp-p)
0.6 0.9 1.2 1.5 1.8 2.1 2.4 2.7
400
360
320
280
240
200
160
120
80
40
0
3
3.3
Output Voltage(Volts)
4x22uF
6x22 uF
Figure 32. Output ripple voltage for various output voltages
with external 8x47 µF or 10x47 µF ceramic capacitors at the
output (35A load). Input voltage is 12V.
8x22 uF
Safety Considerations
0.6 0.9 1.2 1.5 1.8 2.1 2.4 2.7
3
3.3
Output Voltage (Vdc)
Figure 31. Input ripple voltage for various output voltages
with 4x22 µF, 6x22 µF or 8x22 µF ceramic capacitors at the
input (35A load). Input voltage is 12V.
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 2x47 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.
An external 40A 461 series Littelfuse fuse model or equivalent
is recommended on the ungrounded input lead when the
input voltage exceeds 8V. For input voltages less than 8V, 2
parallel 25A 456 series Littelfuse or equivalent are
recommended on the ungrounded 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 32 provides output ripple information for
different external capacitance values at various Vo and a full
load current of 35A. 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.
September 11, 2020
©2017 General Electric Company. All rights reserved.
Page 12
GE
Data Sheet
35A Digital MicroDLynxIITM: Non-Isolated DC-DC Power Modules
4.5Vdc –14.4Vdc input; 0.51Vdc to 3.63Vdc output; 35A Output Current
Analog Feature Descriptions
Digital On/Off
Remote On/Off
Please see the Digital Feature Descriptions section.
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.
The 35A Digital MicroDLynxIITM 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 33. When the external
transistor Q1 is in the OFF state, the internal PWM #Enable is
pulled up internally, thus turning the module ON. When
transistor Q1 is turned ON, the On/Off pin is pulled low, and
consequently the internal PWM Enable signal is pulled low
and the module is OFF.
For negative logic On/Off modules, the circuit configuration is
shown in Fig. 34. The On/Off pin should be pulled high with an
external pull-up resistor. When transistor Q2 is in the OFF
state, the On/Off pin is pulled high, which pulls the internal
ENABLE# High and the module is OFF. To turn the module ON,
Q2 is turned ON pulling the On/Off pin low resulting in the
PWM ENABLE# pin going Low. The maximum voltage allowed
on the On/Off pin is 7V. If Vin is used as a source, then a
suitable external resistor R1 must be used to ensure that the
voltage on the On/Off pin does not exceed 7V
DLYNXII MODULE
40.2K
I
ON/OFF
ENABLE
Q1
GND
Figure 33. Circuit configuration for using positive On/Off
logic.
DLYNXII MODULE
Vin
Analog On/Off
September 11, 2020
6.5V
R1
I
ON/OFF
ENABLE
+
V
ON/OFF
Q2
_
3.09K
GND
Figure 34. Circuit configuration for using negative On/Off
logic.
Monotonic Start-up and Shutdown
The module has monotonic start-up and shutdown behavior
for any combination of rated input voltage, output current
and operating temperature range.
Startup into Pre-biased Output
The module can start into a prebiased output as long as the
prebias voltage is 0.5V less than the set output voltage.
Analog Output Voltage Programming
The output voltage of the module is programmable to any
voltage from 0.6dc to 3.63Vdc 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. 35. The Upper
Limit curve shows that for output voltages lower than 1V, the
©2017 General Electric Company. All rights reserved.
Page 13
GE
Data Sheet
35A Digital MicroDLynxIITM: Non-Isolated DC-DC Power Modules
4.5Vdc –14.4Vdc input; 0.51Vdc to 3.63Vdc output; 35A Output Current
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. At output voltage of 2.5V, the input voltage should
not be below 5Vin and at output voltage of 3.3V the input
voltage should be at least 6Vin.
Table 1 provides Rtrim values required for some common
output voltages.
Table 1
VO, set (V)
0.6
0.9
1.0
1.2
1.5
1.8
2.5
3.3
Rtrim (KΩ)
Open
40
30
20
13.33
10
6.316
4.444
Digital Output Voltage Adjustment
Please see the Digital Feature Descriptions section.
Remote Sense
Figure 35. Output Voltage vs. Input Voltage Set Point Area
plot showing limits where the output voltage can be set for
different input voltages.
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
VIN(+)
VO(+)
VS+
ON/OFF
LOAD
TRIM
Rtrim
SIG_GND
VS─
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 37 shows the circuit
configuration for output voltage margining. The POL
Programming Tool or Power Module Wizard(PMW), available
at www.gecriticalpower.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
Caution – Do not connect SIG_GND to GND elsewhere in the
layout
Figure 36. Circuit configuration for programming output
voltage using an external resistor.
Rmargin-down
MODULE
Q2
Trim
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:
12
Rtrim =
k
(Vo − 0.6)
Rtrim is the external resistor in kΩ
Vo is the desired output voltage.
September 11, 2020
Rmargin-up
Rtrim
Q1
SIG_GND
Figure 37. Circuit Configuration for margining Output
voltage.
©2017 General Electric Company. All rights reserved.
Page 14
GE
Data Sheet
35A Digital MicroDLynxIITM: Non-Isolated DC-DC Power Modules
4.5Vdc –14.4Vdc input; 0.51Vdc to 3.63Vdc output; 35A Output Current
Digital Output Voltage Margining
Please see the Digital Feature Descriptions section.
Output Voltage Sequencing
The power module includes a sequencing feature, EZSEQUENCE that enables users to implement various types of
output voltage sequencing in their applications. This is
accomplished via an additional sequencing pin. When not
using the sequencing feature, leave it unconnected.
When an analog voltage is applied to the SEQ pin, the output
voltage tracks this voltage until the output reaches the setpoint voltage. The final value of the SEQ voltage must be set
higher than the set-point voltage of the module. The output
voltage follows the voltage on the SEQ pin 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.
For proper voltage sequencing, first, input voltage is applied
to the module. The On/Off pin of the module is left
unconnected (or tied to GND for negative logic modules or
tied to VIN for positive logic modules) so that the module is ON
by default. After applying input voltage to the module, a
minimum 10msec delay is required before applying voltage on
the SEQ pin. This delay gives the module enough time to
complete its internal power-up soft-start cycle. During the
delay time, the SEQ pin should be held close to ground
(nominally 50mV ± 20 mV). This is required to keep the
internal op-amp out of saturation thus preventing output
overshoot during the start of the sequencing ramp. By
selecting resistor R1 (see fig. 38) according to the following
equation
R1 =
26150
= 4052 ohms, (4.02K Std.)
6.5 − 0.05
the voltage at the sequencing pin will be 50mV when the
sequencing signal is at zero.
(6.5V)
When using the EZ-SEQUENCETM feature to control start-up of
the module, pre-bias immunity during start-up is disabled. The
pre-bias immunity feature of the module relies on the module
being in the diode-mode during start-up. When using the EZSEQUENCETM feature, modules goes through an internal set-up
time of 10msec, and will be in synchronous rectification mode
when the voltage at the SEQ pin is applied. This will result in
the module sinking current if a pre-bias voltage is present at
the output of the module. When pre-bias immunity during
start-up is required, the EZ-SEQUENCETM feature must be
disabled. For additional guidelines on using the EZSEQUENCETM feature please refer to Application Note AN04008 “Application Guidelines for Non-Isolated Converters:
Guidelines for Sequencing of Multiple Modules”, or contact the
GE technical representative for additional information.
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.
Digital Adjustable Overcurrent Warning
Please see the Digital Feature Descriptions section.
Overtemperature Protection
MODULE
523K
+
OUT
R1
SEQ
After the 10msec delay, an analog voltage is applied to the SEQ
pin and the output voltage of the module will track this voltage
on a one-to-one volt bases until the output reaches the setpoint voltage. 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.
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 122 (typ) is exceeded at the
thermal reference point Tref .Please refer to Electrical
characteristic table, over-temperature section on page 5.
Once the unit goes into thermal shutdown it will then wait to
cool before attempting to restart.
Digital Temperature Status via PMBus
3.09K
Please see the Digital Feature Descriptions section.
Digitally Adjustable Output Over and Under Voltage
Protection
GND
Figure 38. Circuit showing connection of the sequencing
signal to the SEQ pin.
Please see the Digital Feature Descriptions section.
Input Undervoltage Lockout
At input voltages below the input undervoltage lockout limit,
the module operation is disabled. The module will begin to
September 11, 2020
©2017 General Electric Company. All rights reserved.
Page 15
GE
Data Sheet
35A Digital MicroDLynxIITM: Non-Isolated DC-DC Power Modules
4.5Vdc –14.4Vdc input; 0.51Vdc to 3.63Vdc output; 35A Output Current
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.
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. 40. This R-C allows the user to
externally adjust the voltage loop feedback compensation of
the module.
Synchronization
VOUT
VS+
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. 39,
with the converter being synchronized by the rising edge of
the external signal. The Module switches at half the SYNC
frequency. The Electrical Specifications table specifies the
requirements of the external SYNC signal. If the SYNC pin is
not used, the module will free run at the default switching
frequency. If synchronization is not being used, connect the
SYNC pin to SIG_GND.
MODULE
RTune
MODULE
CO
CTune
T RIM
RTr im
SIG_GND
GND
Figure. 40. Circuit diagram showing connection of RTUME and
CTUNE to tune the control loop of the module.
SYNC
+
─
SIG_GND
Figure 39. External source connections to synchronize
switching frequency of the module.
Measuring Output Current, Output Voltage and
Temperature
Please see the Digital Feature Descriptions section.
Dual Layout
Identical dimensions and pin layout of Analog and Digital
MicroDLynxII 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. The
output of the analog module cannot be trimmed down to 0.51V
Tunable LoopTM
Recommended values of RTUNE and CTUNE for different output
capacitor combinations are given in Tables 2 and 3. Table 3
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 3 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 10A to
35A 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.
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
September 11, 2020
Table 2. General recommended values of of RTUNE and CTUNE
for Vin=12V and various external ceramic capacitor
combinations.
Co
16x47F 20x47F 24x47F
30x47F
40x47F
RTUNE
300
300
300
300
300
CTUNE
470pF
560pF
680pF
820pF
1.2nF
©2017 General Electric Company. All rights reserved.
Page 16
GE
Data Sheet
35A Digital MicroDLynxIITM: Non-Isolated DC-DC Power Modules
4.5Vdc –14.4Vdc input; 0.51Vdc to 3.63Vdc output; 35A Output Current
Table 3. Recommended values of RTUNE and CTUNE to obtain
transient deviation of 2% of Vout for a 10A step load with
Vin=12V.
Vo
3.3V
2.5V
1.8V
1.2V
0.6V
Co
8x47uF +
2x330uF
8x47uF +
4x330uF
8x47uF +
7x330uF
8x47uF +
14x330uF
8x47uF +
24x330uF
RTUNE
221Ω
221Ω
221Ω
300Ω
300Ω
CTUNE
2700pF
3300pF
4700pF
10nF
18nF
V
50mV
43mV
32mV
18mV
12mV
Note: The capacitors used in the Tunable Loop tables are 47
μF/3 mΩ ESR ceramic and 330 μF/12 mΩ ESR polymer
capacitors.
Power Module Wizard
GE offers a free web based easy to use tool that helps users
simulate the Tunable Loop performance of the UJT035. Go to
http://ge.transim.com/pmd/Home and sign up for a free
account and use the module selector tool. The tool also offers
downloadable Simplis/Simetrix models that can be used to
assess transient performance, module stability, etc.
September 11, 2020
©2017 General Electric Company. All rights reserved.
Page 17
GE
Data Sheet
35A Digital MicroDLynxIITM: Non-Isolated DC-DC Power Modules
4.5Vdc –14.4Vdc input; 0.51Vdc to 3.63Vdc output; 35A Output Current
recommended). 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 35A Digital MicroDLynxIITM 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.
Digit
0
1
2
3
4
5
6
7
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).
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
Data Byte Low
7 6 5 4 3
2 1 0 7 6 5 4 3 2 1 0
Exponent
Mantissa
MSB
MSB
Value = Mantissa x 2
RADDR0
RADDR1
SIG_GND
Figure 41. Circuit showing connection of resistors used to set
the PMBus address of the module.
Operation (01h)
This is a paged register. The OPERATION command can be use
to turn the module on or off in conjunction with the ON/OFF
pin input. It is also used to margin up or margin down the
output voltage
PMBus Enabled On/Off
The value is of the number is then given by
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 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
September 11, 2020
Resistor Value (KΩ)
11
18.7
27.4
38.3
53.6
82.5
127
187
The module can also be turned on and off via the PMBus
interface. The OPERATION command is used to actually turn
the module on and off via the PMBus, while the
ON_OFF_CONFIG command configures the combination of
analog ON/OFF pin input and PMBus commands needed to
turn the module on and off. Bit [7] in the OPERATION
command data byte enables the module, with the following
functions:
0
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:
©2017 General Electric Company. All rights reserved.
Page 18
GE
Data Sheet
35A Digital MicroDLynxIITM: Non-Isolated DC-DC Power Modules
4.5Vdc –14.4Vdc input; 0.51Vdc to 3.63Vdc output; 35A Output Current
Bit Position
Access
Function
Default Value
4
r/w
PU
1
3
r/w
CMD
0
2
r/w
CPR
1
1
r/w
POL
1
0
r
CPA
0
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.
Table 5
Rise Time
600μs
900μs
1.2ms
1.8ms
2.7ms
4.2ms
6.0ms
9.0ms
Exponent
11100
11100
11100
11100
11100
11100
11100
11100
Mantissa
00000001010
00000001110
00000010011
00000011101
00000101011
00001000011
00001100000
00010010000
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
Action
Module ignores the analog ON/OFF pin, i.e.
0
ON/OFF is only controlled through the
PMBUS via the OPERATION command
Module requires the analog ON/OFF pin to
1
be asserted to start the unit
CPA: Sets the action of the analog ON/OFF pin when turning
the controller OFF. This bit is internally read and cannot be
modified by the user
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.
September 11, 2020
©2017 General Electric Company. All rights reserved.
Page 19
GE
Data Sheet
35A Digital MicroDLynxIITM: Non-Isolated DC-DC Power Modules
4.5Vdc –14.4Vdc input; 0.51Vdc to 3.63Vdc output; 35A Output Current
Output Voltage Adjustment Using the PMBus
The VREF_TRIM parameter is important for a number of
PMBus commands related to output voltage trimming, and
margining. Each of the 2 output voltages of the module can be
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 be 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 VREF_TRIM parameter is used to apply a fixed offset
voltage to the reference voltage can be specified using the
“Linear” format and two bytes. The exponent is fixed at –9
(decimal). The resolution of the adjustment is 7 bits, with a
resulting step size of approximately 0.4%. The maximum trim
range is -20% to +10% of the nominal reference
voltage(600mV) in 2mV steps. Possible values range from 120mV to +60mV. The exception is at 0.6Vout where the
allowable trim range is only -90mV to +60mV to prevent the
module from operating at lower than 0.51Vdc. When
trimming the voltage below 0.6V, the module max. input
voltage operating point also reduces proportionally. As shown
earlier in Fig.41, the maximum permissible input voltage is
13V. For any voltage trimmed below 0.6V, the maximum input
voltage will have to be reduced by the same factor.
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 is adjustable with a
minimum step size of 0.4% over a +10% to -20% range from
nominal using the VREF_TRIM command over the PMBus.
The VREF_TRIM command can be used to apply a fixed offset
voltage to either of the output voltage command value using
the “Linear” mode with the exponent fixed at –9 (decimal).
The value of the offset voltage is given by
VREF(offset) = VREF _ TRIM 2 −9
This offset voltage is added to the voltage set through the
divider ratio and nominal VREF to produce the trimmed output
voltage. If a value outside of the +10%/-20% adjustment range
is given with this command, the module will set it’s output
voltage to the upper or lower limit value (as if VOUT_TRIM,
assert SMBALRT#, set the CML bit in STATUS_BYTE and the
invalid data bit in STATUS_CML.
Applications Example
For a design where the output voltage is 1.8V and the output
needs to be trimmed down by 20mV.
September 11, 2020
• The internal reference voltage is 0.6V. So we need to
determine how the 20mV translates to a change in the
internal reference voltage.
• Divider Ratio = Vref/Vout = 0.6/1.8 = 0.33
• Hence a 20mV change at 1.8Vo requires a 0.33x20mV =
6.6mV change in the reference voltage.
• Vref(offset) = - (6.6)/1000 = - 0.0066 Volts (- sign since we
are trimming down)
• Vref(offset) = Vref_Trim x 2 -9
• Vref_Trim = Vref(offset) x 512
• Vref_Trim = -0.0066 x 512 = -3.3 = -3 (rounded to nearest
integer
Output Voltage Margining Using the PMBus
The module can also have its output margined via PMBus
commands. The command STEP_VREF_MARGIN_HIGH will set
the margin high voltage, while the command
STEP_VREF_MARGIN_LOW sets the margin low voltage. Both
the STEP_VREF_MARGIN_HIGH and
STEP_VREF_MARGIN_LOW commands will use the “Linear”
mode with the exponent fixed at –9 (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 STEP_VREF_MARGIN_HIGH or
STEP_VREF_MARGIN_LOW and the VREF_TRIM values as
shown below. The net permissible voltage range change is 30% to +10% for the margin high command and -20% to 0%
for the margin low command
VREF( MH ) =
( STEP _ VREF _ MARGIN _ HIGH + VREF _ TRIM ) 2 −9
Applications Example
For a design where the output voltage is 1.2V and the output
needs to be trimmed up by 100mV (within 10% of Vo).
• The internal reference voltage is 0.6V. So we need to
determine how the 100mV translates to a change in the
internal reference voltage.
• Divider Ratio = Vref/Vout = 0.6/1.2 = 0.5
• Hence a 100mV change at 1.2Vo requires a 0.5x100mV =
50mV change in the reference voltage.
• VREF(MH) = (50)/1000 = 0.05 Volts
• VREF(MH) = (Step_Vref_margin_high + Vref_trim) x 2 -9
• Assume Vref_Trim = 0 here
• Step_Vref_margin_high = VREF(MH) x 512
• Step_Vref_margin_high = 0.05 x 25.6 = 26 (rounded to nearest
integer
VREF( ML) =
( STEP _ VREF _ MARGIN _ LOW + VREF _ TRIM ) 2 −9
Applications Example
For a design where the output voltage is 1.8V and the output
needs to be trimmed down by 100mV (within -20% of Vo).
• The internal reference voltage is 0.6V. So we need to
determine how the 100mV translates to a change in the
internal reference voltage.
• Divider Ratio = Vref/Vout = 0.6/1.8 = 0.33
• Hence a 100mV change at 1.2Vo requires a 0.33x100mV =
33mV change in the reference voltage.
©2017 General Electric Company. All rights reserved.
Page 20
GE
Data Sheet
35A Digital MicroDLynxIITM: Non-Isolated DC-DC Power Modules
4.5Vdc –14.4Vdc input; 0.51Vdc to 3.63Vdc output; 35A Output Current
• VREF(MH) = -(33)/1000 = - 0.033 Volts (- sign since we are
margining down)
• VREF(ML) = (Step_Vref_margin_low + Vref_trim) x 2 -9
• Assume Vref_Trim = - 3 here (from V Ref_Trim example
earlier)
• Step_Vref_margin_low = VREF(ML) x 512 - Vref_trim
• Step_Vref_margin_low = -0.033 x 512 – (-3) = -16.9+3 = -13.9 = 14 (rounded to nearest integer
The module will support 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 (Act on Fault)
Margin Low (Act on Fault)
Margin High (Act on Fault)
Margin High (Act on Fault)
PMBus Adjustable Overcurrent Warning
The module can provide an overcurrent warning via the
PMBus. The threshold for the overcurrent warning can be set
using the parameter IOUT_OC_WARN_LIMIT. This command
uses the “Linear” data format with a two byte data word
where the upper five bits [7:3] of the high byte represent the
exponent and the remaining three bits of the high byte [2:0]
and the eight bits in the low byte represent the mantissa. The
exponent is fixed at –1 (decimal). The upper five bits of the
mantissa are fixed at 0 while the lower six bits are
programmable with a default value of 37A (decimal). The
resolution of this warning limit is 500mA. The value of the
IOUT_OC_WARN_LIMIT can be stored to non-volatile memory
using the STORE_DEFAULT_ALL command
Temperature Status via PMBus
The module will provide information related to temperature
of the module through the READ_TEMPERATURE_2 command.
The command returns external temperature in degrees
Celsius. This command will use the “Linear” data format with
a two byte data word where the upper five bits [7:3] of the
high byte will represent the exponent and the remaining three
bits of the high byte [2:0] and the eight bits in the low byte
will represent the mantissa. The exponent is fixed at 0
(decimal). The lower 11 bits are the result of the ADC
conversion of the external temperature
PMBus Adjustable Output Over, Under Voltage
Protection and Power Good
The module has a common command to set the PGOOD,
VOUT_UNDER_VOLTAGE(UV) and VOUT_OVER_VOLTAGE (OV)
limits as a percentage of nominal. Refer to Table 6 of the next
section for the available settings. The PMBus command
VOUT_OVER_VOLTAGE (OV) is used to set the output over
voltage threshold from two possible values: +12.5% or
+16.67% of the commanded output voltage for each output.
September 11, 2020
The module provides a Power Good (PGOOD) 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 is 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
PGL (POWERGOODLOW) command will set the output voltage
level above which PGOOD is asserted (lower threshold). The
PGH(POWERGOODHIGH) command will set the level above
which the PGOOD command is de-asserted. This command
will also set two thresholds symmetrically placed around the
nominal output voltage. Normally, the PGL threshold is set
higher than the PGH threshold.
The PGOOD terminal can be connected through a pullup
resistor (suggested value 100K) to a source of 5VDC or
lower. The current through the PGood terminal should be
limited to a max value of 5mA
PMBus Adjustable Input Undervoltage Lockout
The module allows for adjustment of the input under voltage
lockout and hysteresis. The command VIN_ON allows setting
the input voltage turn on threshold for each output, while the
VIN_OFF command will set the input voltage turn off
threshold. For the VIN_ON command, possible values are
4.25V to 16V in variable steps. For the VIN_OFF command,
possible values are 4V to 15.75V in 0.5V steps. If other values
are entered for either command, they is mapped to the
closest of the allowed values.
Both the VIN_ON and VIN_OFF commands use the “Linear”
format with two data bytes. The upper five bits will represent
the exponent (fixed at -2) and the remaining 11 bits will
represent the mantissa. For the mantissa, the four most
significant bits are fixed at 0.
Measurement of Output Current and Voltage
The module is capable of measuring key module parameters
such as output current and voltage and providing this
information through the PMBus interface.
Measuring Output Current Using the PMBus
The module measures current by using the inductor winding
resistance as a current sense element. The inductor winding
resistance is then the current gain factor used to scale the
measured voltage into a current reading. This gain factor is
the argument of the IOUT_CAL_GAIN command, and consists
of two bytes in the linear data format. The exponent uses the
upper five bits [7:3] of the high data byte in two-s
complement format and is fixed at –4 (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. DONOT CHANGE THE FACTORY
PROGRAMMED VALUE.
©2017 General Electric Company. All rights reserved.
Page 21
GE
Data Sheet
35A Digital MicroDLynxIITM: Non-Isolated DC-DC Power Modules
4.5Vdc –14.4Vdc input; 0.51Vdc to 3.63Vdc output; 35A Output Current
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. DONOT CHANGE THE FACTORY PROGRAMMED
VALUE.
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
resolution of the command is 62.5mA. 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.
Measuring Output Voltage Using the PMBus
The module provides output voltage information using the
READ_VOUT command for each output. In this module the
output voltage is sensed at the remote sense amplifier output
pin so voltage drop to the load is not accounted for. The
command will return two bytes of data all representing the
mantissa while the exponent is fixed at -9 (decimal).
Reading the Status of the Module using the PMBus
The module supports a number of status information
commands implemented in PMBus. 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
Default
Flag
Position
Value
7
X
0
6
OFF
0
5
VOUT Overvoltage
0
4
IOUT Overcurrent
0
3
VIN Undervoltage
0
2
Temperature
0
1
CML (Comm. Memory Fault)
0
0
None of the above
0
STATUS_WORD : Returns two bytes of information with a
summary of the module’s fault/warning conditions.
Low Byte
Bit
Default
Flag
Position
Value
7
X
0
6
OFF
0
5
VOUT Overvoltage
0
September 11, 2020
4
3
2
1
0
IOUT Overcurrent
VIN Undervoltage
Temperature
CML (Comm. Memory Fault)
None of the above
0
0
0
0
0
High Byte
Bit
Position
7
6
5
4
3
2
1
0
Flag
VOUT fault or warning
IOUT fault or warning
X
MFR
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
Default
Flag
Position
Value
7
VOUT OV Fault
0
6
X
0
5
X
0
4
VOUT UV Fault
0
3
X
0
2
X
0
1
X
0
0
X
0
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
Flag
IOUT OC Fault
X
IOUT OC Warning
X
X
X
X
X
Default
Value
0
0
0
0
0
0
0
0
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
©2017 General Electric Company. All rights reserved.
Flag
OT Fault
OT Warning
X
X
X
X
Default
Value
0
0
0
0
0
0
Page 22
GE
Data Sheet
35A Digital MicroDLynxIITM: Non-Isolated DC-DC Power Modules
4.5Vdc –14.4Vdc input; 0.51Vdc to 3.63Vdc output; 35A Output Current
1
0
X
X
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
Memory Fault Detected
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 and revision number. Bits [7:2] in the Low Byte
indicate the module type (010011 corresponds to the UJT035
series of module), while bits [7:3] indicate the revision
number of the module.
Low Byte
Bit
Position
7:2
1:0
Flag
Module Name
Reserved
Default
Value
010011
10
High Byte
Bit
Position
7:3
2:0
Flag
Module Revision Number
Reserved
September 11, 2020
Default
Value
None
000
©2017 General Electric Company. All rights reserved.
Page 23
GE
Data Sheet
35A Digital MicroDLynxIITM: Non-Isolated DC-DC Power Modules
4.5Vdc –14.4Vdc input; 0.51Vdc to 3.63Vdc output; 35A 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
Brief Description
Non-Volatile
Memory Storage
Turn Module on or off. Also used to margin the output voltage
01
OPERATION
02
ON_OFF_CONFIG
03
CLEAR_FAULTS
10
WRITE_PROTECT
15
STORE_USER_ALL
16
RESTORE_USER_ALL
19
CAPABILITY
September 11, 2020
Format
Unsigned Binary
Bit Position
7
6
5
4
3
2
1
0
Access
r/w
r
r/w
r/w
r/w
r/w
r
r
Function
On
X
Margin
X
X
Default Value
0
0
0
0
0
0
X
X
Bit 7: 0 Output switching disabled
1
Output switching enabled
Margin: 00XX Margin Off
0101 Margin Low ( Act on fault)
0110 Margin Low (Act on fault)
1001 Margin High (Act on fault)
1010 Margin High (Act on fault)
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
0
Refer to Page 19 for details on pu, cmd, cpr, pol and cpa
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 non-volatile 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, PAGE 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, PAGE and
OPERATION commands (bit5 and bit7 must be 0)
Bit7: 0 – Enables all writes as permitted in bit5 or bit6
1 – Disables all writes except for the WRITE_PROTECT command
(bit5 and bit6 must be 0)
YES
YES
Stores all of the current storable register settings in the EEPROM memory as the
new defaults on power up
Restores all of the storable register settings from the non-volatile memory
(EEPROM). The command should not be used while the device is actively switching
This command helps the host system/GUI/CLI determine key capabilities of the
module
Format
Unsigned Binary
Bit Position
7
6
5
4
3
2
1
0
Access
r
r
r
r
r
r
r
r
Function
PEC
SPD
ALRT
Reserved
Default Value
1
0
1
1
0
0
0
0
PEC – 1 Supported
SPD -01 – max of 400kHZ
ALRT – 1 – SMBALERT# supported
©2017 General Electric Company. All rights reserved.
Page 24
GE
Data Sheet
35A Digital MicroDLynxIITM: Non-Isolated DC-DC Power Modules
4.5Vdc –14.4Vdc input; 0.51Vdc to 3.63Vdc output; 35A Output Current
Hex
Code
Command
20
VOUT_MODE
35
VIN_ON
36
38
VIN_OFF
IOUT_CAL_GAIN
September 11, 2020
Brief Description
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
1
Mode: Value fixed at 000, linear mode
Exponent: Value fixed at 10111, Exponent for linear mode values is -9
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
1
0
0
0
1
Exponent -2 (dec), fixed
Mantissa
The upper four bits are fixed at 0
The lower seven are programmable with a default value of 9(dec). This
corresponds to a default of 4.25V. Allowable values are
•
4.25, in steps of 0.25V upto 9.5V.
•
9.5V to 13V in increments of 0.5V
•
13V to 16V in increments of 1V
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
1
0
0
0
0
Exponent -2 (dec), fixed
Mantissa
The upper four bits are fixed at 0
The lower seven are programmable with a default value of 8(dec). This
corresponds to a default of 4.0V.
Allowable values are
•
4.00, in steps of 0.25V upto 9.75V.
•
10.25V to 11.75V in increments of 0.5V
•
12V
•
13.75V to 15.75V in increments of 1V
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
V
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
©2017 General Electric Company. All rights reserved.
Non-Volatile
Memory Storage
YES
YES
YES
Page 25
GE
Data Sheet
35A Digital MicroDLynxIITM: Non-Isolated DC-DC Power Modules
4.5Vdc –14.4Vdc input; 0.51Vdc to 3.63Vdc output; 35A Output Current
Hex
Code
39
46
Command
Non-Volatile
Memory Storage
Brief Description
IOUT_CAL_OFFSET
Returns the value of the offset correction 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
V
V
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
V: Variable based on factory calibration
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
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
0
1
1
0
1
0
YES
Value maybe locked
Determines module action in response to an IOU_OC_FAULT_LIMIT or a VOUT
undervoltage (UV) fault
47
IOUT_OC_FAULT_RESPONSE
Format
Bit Position
Access
7
r
6
r
Function
X
X
Default Value
0
0
5
r/w
RS
[2]
1
Unsigned Binary
4
3
r/w
r/w
RS
RS
[1]
[0]
1
1
2
r
1
r
0
r
x
X
X
1
0
0
YES
RS[2:0] – Retry Setting
000 Unit does not attempt to restart
111 Unit goes through normal soft start continuously
Any other value is not acceptable
4A
4F
IOUT_OC_WARN_LIMIT
Sets the output overcurrent warning level in A. Must be lower than
IOUT_OC_FAULT_LIMIT
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
0
0
1
0
1
0
OT_FAULT_LIMIT
Sets the overtemperature fault level in °C
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
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
Mantissa
Default Value
0
1
1
1
1
0
1
0
Value may be locked
September 11, 2020
©2017 General Electric Company. All rights reserved.
YES
Page 26
GE
Data Sheet
35A Digital MicroDLynxIITM: Non-Isolated DC-DC Power Modules
4.5Vdc –14.4Vdc input; 0.51Vdc to 3.63Vdc output; 35A Output Current
Table 6 (Continued)
Hex
Code
51
Command
OT_WARN_LIMIT
61
TON_RISE
78
STATUS_BYTE
79
STATUS_WORD
7A
7B
Brief Description
Sets the over temperature warning level in °C. Must be lower than OT_FAULT_LIMIT
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
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
Mantissa
Default Value
0
1
1
0
1
0
0
1
Sets the rise time of the output voltage during startup.
Supported Values – 0.6, 0.9, 1.2, 1.8, 2.7, 4.2, 6.0, 9.0msec. Value of 0 instructs unit to
bring its output to programmed value as quickly as possible
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
1
0
0
0
0
1
1
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
None
VOUT IOUT_ VIN_U
Flag
X
OFF
TEMP CML of the
_OV
OC
V
Above
Default Value
0
0
0
0
0
0
0
0
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/P
Flag
VOUT
X
MFR PGOOD
X
X
X
OUT
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
None of
VOUT_ IOUT_O
Flag
X
OFF
VIN_UV TEMP
CML
the
OV
C
above
Default Value
0
X
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 Fault X
IOUT OC Warning
X
X X X X
Default Value
0
0
0
0
0
0 0 0
September 11, 2020
Non-Volatile
Memory Storage
©2017 General Electric Company. All rights reserved.
YES
YES
Page 27
GE
Data Sheet
35A Digital MicroDLynxIITM: Non-Isolated DC-DC Power Modules
4.5Vdc –14.4Vdc input; 0.51Vdc to 3.63Vdc output; 35A Output Current
Hex
Code
7D
Non-Volatile
Memory Storage
Command
Brief Description
STATUS_TEMPERATURE
Returns one byte of information with the status of the module’s temperature related faults
Format
Unsigned Binary
Bit Position
7
6
5
4
3
2
1
0
Access
r
r
r
r
r
r
r
r
Flag
OT_FAULT
OT_WARN
X
X
X
X
X
X
Default Value
0
0
0
0
0
0
0
0
7E
STATUS_CML
80
STATUS_MFR_SPECIFIC
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
Memory
Other
Invalid
Invalid PEC
Flag
fault
X
X
Comm
X
Command Data Fail
detected
Fault
Default Value
0
0
0
0
0
0
0
0
Returns one byte of information with the status of the module specific faults or warning
Format
Unsigned Binary
Bit Position
7
6
5
4
3
2
1
0
Access
r
r
r
r
r
r
r
R
Flag
OTFI
x
X
IVADDR
X
X
X
TWOPH_EN
Default Value
0
0
0
0
0
0
0
OTFI – Internal Temperature above Thermal Shutdown threshold
IVADDR – PMBUs address is not valid
TWOPH_EN – Module is in 2 phase mode
8B
8C
0
READ_VOUT
Returns the value of the output voltage of the module. Exponent is fixed at -9.
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
V
V
Bit Position
7
6
5
4
3
2
1
Access
r
r
r
r
r
r
r
Function
Mantissa
Default Value
V
V
V
V
V
V
V
V - Variable
September 11, 2020
©2017 General Electric Company. All rights reserved.
0
r
V
0
r
0
Page 28
GE
Data Sheet
35A Digital MicroDLynxIITM: Non-Isolated DC-DC Power Modules
4.5Vdc –14.4Vdc input; 0.51Vdc to 3.63Vdc output; 35A Output Current
Table 6 (Continued)
Hex
Code
8E
98
Command
READ_TEMPERATURE_2
PMBUS_REVISION
D0
MFR_SPECIFIC_00
D4
VREF_TRIM
D5
STEP_VREF_MARGIN_HIGH
September 11, 2020
Non-Volatile
Memory Storage
Brief Description
Returns the value of the external temperature in degree Celsius
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
0
0
0
0
0
V
V
Bit Position
7
6
5
4
3
2
1
Access
r
r
r
r
r
r
r
Function
Mantissa
Default Value
V
V
V
V
V
V
V
V - Variable
0
r
V
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
Returns module name information
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
1
0
0
1
1
0
0
Applies a fixed offset to the reference voltage. Max trim range is -20% to +10% in 2mV
steps. Permissible values range between -120mV and +60mV. The offset is calculated as
VREF_TRIMx2-9. Exponent fixed at -9(dec)
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
V
V
V
V
V
V
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
V
V
V
V
V
V
V
V
Applies a fixed offset to the reference voltage. Adjustment is 0% to +10% in 2mV steps.
Permissible values range between 0mV and +60mV. The offset is calculated as
(STEP_VREF_MARGIN_HIGH + VREF_TRIM)x2-9. Exponent fixed at -9(dec). Net output
voltage includes VREF_TRIM adjustment and ranges from -30% to 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
V
V
V
V
V
V
V
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
©2017 General Electric Company. All rights reserved.
YES
YES
YES
Page 29
GE
Data Sheet
35A Digital MicroDLynxIITM: Non-Isolated DC-DC Power Modules
4.5Vdc –14.4Vdc input; 0.51Vdc to 3.63Vdc output; 35A Output Current
Table 6 (Continued)
Hex
Code
D6
D7
D8
Command
STEP_VREF_MARGIN_LOW
PCT_VOUT_FAULT_PG_LIMIT
Non-Volatile
Memory
Storage
Brief Description
Applies a fixed negative offset to the reference voltage. Adjustment is -20% to 0% in 2mV
steps. Permissible values range between -120mV and 0mV) The offset is calculated as
(STEP_VREF_MARGIN_LOW + VREF_TRIM)x2-9.Exponent fixed at -9(dec). Net output voltage
includes VREF_TRIM adjustment and ranges from -30% to 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
V
V
V
V
V
V
V
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
V
V
V
V
V
V
V
V
Single command to set PGOOD, VOUT_UNDER_VOLTAGE(UV) and
VOUT_OVER_VOLTAGE(OV) limits as percentage of nominal
Format
Bit Position
7
6
5
Access
r
r
r
r
Function
X
X
X
X
X
Default Value
0
PAGE Command Truth Table
Unsigned Binary
4
3
2
1
0
r
r
r/w
r/w
X
X
X
PCT_
MSB
PCT_
LSB
X
X
X
0
0
PCT_M
SB
PCT_LS
B
UV (%)
PGL
LOW
(%)
PGL
HIGH
(%)
PGH
HIGH
(%)
PGH
LOW (%)
OV (%)
0
0
-16.67
-12.5
-8.33
12.5
8.33
16.67
0
1
-12.5
-8.33
-4.17
8.33
4.17
12.5
1
0
-29.17
-20.83
-16.67
8.33
4.17
12.5
1
1
-41.67
-37.5
-33.33
8.33
4.17
12.5
YES
Used to set delay to turn-on or turn-off modules as a ratio of TON_RISE. Values can range
from 0 to 7 and are a multiple of TON_RISE TIME
Format
Unsigned Binary
Bit Position
7
6
5
4
3
2
1
0
SEQUENCE_TON_TOFF_DELAY
Access
r/w
r/w
r/w
r
r/w
r/w
r/w
r
Function
TON_DELAY
TOFF_DELAY
Default Value
0
0
0
0
0
0
0
0
Digital Power Insight (DPI)
GE offers a software tool that set helps users evaluate and simulate the PMBus performance of the UJT035 modules without the
need to write software.
The software can be downloaded for free at http://go.ge-energy.com/DigitalPowerInsight.html. A GE USB to I2C
adapter and associated cable set are required for proper functioning of the software suite. For first time users, the GE DPI Evaluation
Kit can be purchased from leading distributors at a nominal price and can be used across the entire range of GE Digital POL Module.
September 11, 2020
©2017 General Electric Company. All rights reserved.
Page 30
GE
Data Sheet
35A Digital MicroDLynxIITM: Non-Isolated DC-DC Power Modules
4.5Vdc –14.4Vdc input; 0.51Vdc to 3.63Vdc output; 35A 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 42. The preferred
airflow direction for the module is in Figure 43.
The thermal reference point, Tref used in the specifications is
shown in Figure 43. For reliable operation, the temperature at
this points should not exceed 115oC. 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
Figure 43. Preferred airflow direction and location of hotspot of the module (Tref).
76.2_
(3.0)
x
12.7_
(0.50)
Probe Location
for measuring
airflow and
ambient
temperature
Air
flow
Figure 42. Thermal Test Setup.
September 11, 2020
©2017 General Electric Company. All rights reserved.
Page 31
GE
Data Sheet
35A Digital MicroDLynxIITM: Non-Isolated DC-DC Power Modules
4.5Vdc –14.4Vdc input; 0.51Vdc to 3.63Vdc output; 35A Output Current
Example Application Circuit
Requirements:
Vin:
12V
Vout:
1.8V
Iout:
26A max., worst case load transient is from 17.5A to 26A
Vout:
1.5% of Vout (27mV) for worst case load transient
Vin, ripple
1.5% of Vin (180mV, p-p)
Vin+
VIN
Vout+
VOUT
VS+
PGOOD
RTUNE
MODULE
SEQ
CTUNE
CLK
CI3
CI2
CI1
TRIM
DATA
CO1
CO2
CO3
ADDR0
SMBALRT#
RTrim
ADDR1
ON/OFF
SYNC
RADDR1
RADDR0
SIG_GND
GND
VS-
GND
CI1
Decoupling caps - 1x0.047F/16V 0402 or 0306ceramic capacitor (e.g. Murata LLL185R71C473MA01) +
1x0.1uF/16V 0402 ceramic cpacitor
CI2
6x22F/16V ceramic capacitor (e.g. Murata GRM32ER61C226KE20)
CI3
47F/16V bulk electrolytic
CO1
Decoupling cap - 1x0.047F/16V ceramic capacitor (e.g. Murata LLL185R71C473MA01) + 1x0.1uF/16V 0402
ceramic cpacitor
CO2
8 x 47uF/6.3V 1210 ceramic capacitor
CO3
4 x 330uF/6V POSCAP
CTune
3300pF ceramic capacitor (can be 1206, 0805 or 0603 size)
RTune
300Ω 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.
September 11, 2020
©2017 General Electric Company. All rights reserved.
Page 32
GE
Data Sheet
35A Digital MicroDLynxIITM: Non-Isolated DC-DC Power Modules
4.5Vdc –14.4Vdc input; 0.51Vdc to 3.63Vdc output; 35A 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.)
PIN
1
2
3
4
5
6
7
8
9
FUNCTION
ON/OFF
VIN
SEQ
GND
TRIM
VOUT
VS+
VSPG
1 If
September 11, 2020
©2017 General Electric Company. All rights reserved.
PIN
10
11
12
13
14
15
16
17
FUNCTION
SYNC2
CLK
DATA
SMBALERT#
SIG_GND
ADDR1
ADDR0
INPUT_GND
unused, connect to SIG_GND
Page 33
GE
Data Sheet
35A Digital MicroDLynxIITM: Non-Isolated DC-DC Power Modules
4.5Vdc –14.4Vdc input; 0.51Vdc to 3.63Vdc output; 35A 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
FUNCTION
ON/OFF
VIN
SEQ
GND
TRIM
VOUT
VS+
VSPG
2 If
September 11, 2020
PIN
10
11
12
13
14
15
16
17
FUNCTION
SYNC2
CLK
DATA
SMBALERT#
SIG_GND
ADDR1
ADDR0
INPUT_GND
unused, connect to SIG_GND.
©2017 General Electric Company. All rights reserved.
Page 34
GE
Data Sheet
35A Digital MicroDLynxIITM: Non-Isolated DC-DC Power Modules
4.5Vdc –14.4Vdc input; 0.51Vdc to 3.63Vdc output; 35A Output Current
Packaging Details
The 12V Digital MicroDLynxIITM 35A modules are supplied in tape & reel as standard. Modules are shipped in quantities of 200
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:
44.00 mm (1.732”)
September 11, 2020
©2017 General Electric Company. All rights reserved.
Page 35
GE
Data Sheet
35A Digital MicroDLynxIITM: Non-Isolated DC-DC Power Modules
4.5Vdc –14.4Vdc input; 0.51Vdc to 3.63Vdc output; 35A Output Current
Surface Mount Information
Pick and Place
The 35A Digital MicroDLynxIITM 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.
detailed in J-STD-033 Rev. A (Handling, Packing, Shipping and
Use of Moisture/Reflow Sensitive Surface Mount Devices).
Moisture barrier bags (MBB) with desiccant are required for
MSL ratings of 2 or greater. These sealed packages should not
be broken until time of use. Once the original package is
broken, the floor life of the product at conditions of 30°C
and 60% relative humidity varies according to the MSL rating
(see J-STD-033A). The shelf life for dry packed SMT packages
will be a minimum of 12 months from the bag seal date, when
stored at the following conditions: < 40° C, < 90% relative
humidity.
300
Per J-STD-020 Rev. D
Peak Temp 260°C
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.
Reflow Temp (°C)
250
200
* Min. Time Above 235°C
15 Seconds
Cooling
Zone
150
Heating Zone
1°C/Second
*Time Above 217°C
60 Seconds
100
50
0
Bottom Side / First Side Assembly
Reflow Time (Seconds)
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.
Figure 44. Recommended linear reflow profile using
Sn/Ag/Cu solder.
Lead Free Soldering
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).
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.
Pb-free Reflow Profile
Post Solder Cleaning and Drying Considerations
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). For
questions regarding Land grid array(LGA) soldering, solder
volume; please contact GE for special manufacturing process
instructions. The recommended linear reflow profile using
Sn/Ag/Cu solder is shown in Fig. 44. Soldering outside of the
recommended profile requires testing to verify results and
performance.
MSL Rating
The 35A Digital MicroDLynxIITM modules have a MSL rating of
2A.
Storage and Handling
The recommended storage environment and handling
procedures for moisture-sensitive surface mount packages is
September 11, 2020
©2017 General Electric Company. All rights reserved.
Page 36
GE
Data Sheet
35A Digital MicroDLynxIITM: Non-Isolated DC-DC Power Modules
4.5Vdc –14.4Vdc input; 0.51Vdc to 3.63Vdc output; 35A Output Current
Ordering Information
Please contact your GE Sales Representative for pricing, availability and optional features.
Table 9. Device Codes
Device Code
Input
Voltage Range
Output
Voltage
Output
Current
On/Off
Logic
Sequencing
Comcodes
UJT035A0X3-SRZ
4.5 – 14.4Vdc
0.51 – 3.63Vdc
35A
Negative
Yes
150047126
UJT035A0X43-SRZ
4.5 – 14.4Vdc
0.51 – 3.63Vdc
35A
Positive
Yes
150047127
-Z refers to RoHS compliant parts
Table 10. Coding Scheme
Package
Identifier
Family
U
P=Pico
U=Micro
M=Mega
G=Giga
Sequencing
Option
Output
current
Output
voltage
J
T
035A0
X
J=DLynx II
Digital
T=with EZ
Sequence
35A
K=
DLynxII
Analog.
X=without
sequencing
X=
programma
ble output
On/Off
logic
4=
positive
No entry
=
negative
Remote
Sense
Options
3
-SR
3=
Remote
Sense
S=
Surface
Mount
ROHS
Compliance
Z
No entry =
Standard
Z = ROHS6
R=
Tape &
Reel
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.
September 11, 2020
©2016 General Electric Company. All International rights reserved.
Version 1_14
工商网监
湘ICP备2023018690号
