GE Data Sheet
May 6, 2013 ©2013 General Electric Company. All rights reserved.
12V Austin MicroLynxTM 5A: Non-Isolated DC-DC Power Module
10Vdc – 14Vdc input; 0.75Vdc to 5.5Vdc Output; 5A Output Current
Features
Compliant to RoHS EU Directive 2002/95/EC (-Z versions)
Compliant to ROHS EU Directive 2002/95/EC with lead
solder exemption (non-Z versions)
Delivers up to 5A output current
High efficiency – 89% at 3.3V full load (VIN = 12.0V)
Small size and low profile:
20.3 mm x 11.4 mm x 7.24 mm
(0.8 in x 0.45 in x 0.285 in)
Low output ripple and noise
High Reliability:
Calculated MTBF = 5.6M hours at 25oC Full-load
Output voltage programmable from 0.75 Vdc to 5.5Vdc
via external resistor
Line Regulation: 0.3% (typical)
Load Regulation: 0.4% (typical)
Temperature Regulation: 0.4 % (typical)
Remote On/Off
Output overcurrent protection (non-latching)
Wide operating temperature range (-40°C to 85°C)
UL* 60950-1Recognized, CSA† C22.2 No. 60950-1-03
Certified, and VDE‡ 0805:2001-12 (EN60950-1) Licensed
ISO** 9001 and ISO 14001 certified manufacturing
facilities
Applications
Distributed power architectures
Intermediate bus voltage applications
Telecommunications equipment
Servers and storage applications
Networking equipment
Enterprise Networks
Latest generation IC’s (DSP, FPGA, ASIC) and
Microprocessor powered applications
Description
Austin MicroLynxTM 12Vdc SMT (surface mount technology) power modules are non-isolated dc-dc converters that can deliver up
to 5A of output current with full load efficiency of 89% at 3.3V output. These modules provide precisely regulated output voltage
programmable via external resistor from 0.75Vdc to 5.5Vdc over a wide range of input voltage (VIN = 10 - 14V). Their open-frame
construction and small footprint enable designers to develop cost- and space-efficient solutions. Standard features include
remote On/Off, programmable output voltage and overcurrent protection.
* 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
RoHS Compliant
GE Data Sheet
12V Austin MicroLynxTM 5A: Non-Isolated DC-DC Power Modules
10Vdc –14Vdc input; 0.75Vdc to 5.5Vdc output; 5A Output Current
May 6, 2013 ©2013 General Electric Company. All rights reserved. Page 2
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 Vdc
Continuous
Operating Ambient Temperature All TA -40 85 °C
(see Thermal Considerations section)
Storage Temperature All Tstg -55 125 °C
Electrical Specifications
Unless otherwise indicated, specifications apply over all operating input voltage, resistive load, and temperature conditions.
Parameter Device Symbol Min Typ Max Unit
Operating Input Voltage All VIN 10 12 14 Vdc
Maximum Input Current All IIN,max 3.5 Adc
(VIN= VIN, min to VIN, max, IO=IO, max )
Input No Load Current VO,set = 0.75 Vdc IIN,No load 17 mA
(VIN = VIN, nom, Io = 0, module enabled) VO,set = 5.0Vdc IIN,No load 100 mA
Input Stand-by Current All IIN,stand-by 1.2 mA
(VIN = VIN, nom, module disabled)
Inrush Transient All I2t 0.4 A2s
Input Reflected Ripple Current, peak-to-peak
(5Hz to 20MHz, 1μH source impedance; VIN, min to VIN,
max, IO= IOmax ; See Test configuration section)
All 30 mAp-p
Input Ripple Rejection (120Hz) All 30 dB
CAUTION: This power module is not internally fused. An input line fuse must always be used.
This power module can be used in a wide variety of applications, ranging from simple standalone operation to being part of a
complex power architecture. To preserve maximum flexibility, internal fusing is not included, however, to achieve maximum safety
and system protection, always use an input line fuse. The safety agencies require a fast-acting fuse with a maximum rating of 6 A
(see Safety Considerations section). Based on the information provided in this data sheet on inrush energy and maximum dc input
current, the same type of fuse with a lower rating can be used. Refer to the fuse manufacturer’s data sheet for further information.
GE Data Sheet
12V Austin MicroLynxTM 5A: Non-Isolated DC-DC Power Modules
10Vdc –14Vdc input; 0.75Vdc to 5.5Vdc output; 5A Output Current
May 6, 2013 ©2013 General Electric Company. All rights reserved. Page 3
Electrical Specifications (continued)
Parameter Device Symbol Min Typ Max Unit
Output Voltage Set-point All VO, set -2.0 VO, set +2.0 % VO, set
(VIN=IN, min, IO=IO, max, TA=25°C)
Output Voltage All VO, set -2.5% ⎯ +3.5% % VO, set
(Over all operating input voltage, resistive load,
and temperature conditions until end of life)
Adjustment Range All VO 0.7525 5.5 Vdc
Selected by an external resistor
Output Regulation
Line (VIN=VIN, min to VIN, max) All
⎯ 0.3 ⎯ % VO, set
Load (IO=IO, min to IO, max) All
⎯ 0.4 ⎯ % VO, set
Temperature (Tref=TA, min to TA, max) All
⎯ 0.4 ⎯ % VO, set
Output Ripple and Noise on nominal output
(VIN=VIN, nom and IO=IO, min to IO, max
Cout = 1μF ceramic//10μFtantalum capacitors)
RMS (5Hz to 20MHz bandwidth) All ⎯ 15 30 mVrms
Peak-to-Peak (5Hz to 20MHz bandwidth) All ⎯ 30 75 mVpk-pk
External Capacitance
ESR ≥ 1 mΩ All CO, max ⎯ ⎯ 1000 μF
ESR ≥ 10 mΩ All CO, max ⎯ ⎯ 3000 μF
Output Current All Io 0 5 Adc
Output Current Limit Inception (Hiccup Mode ) All IO, lim ⎯ 200 ⎯ % Io
(VO= 90% of VO, set)
Output Short-Circuit Current All IO, s/c ⎯ 2 ⎯ Adc
(VO≤250mV) ( Hiccup Mode )
Efficiency VO, set = 1.2Vdc η 81.5 %
VIN= VIN, nom, TA=25°C VO,set = 1.5Vdc η 84.0 %
IO=IO, max , VO= VO,set V
O,set = 1.8Vdc η 85.0 %
V
O,set = 2.5Vdc η 87.0 %
V
O,set = 3.3Vdc η 89.0 %
V
O,set = 5.0Vdc η 92.0 %
Switching Frequency All fsw ⎯ 300 ⎯ kHz
Dynamic Load Response
(dIo/dt=2.5A/μs; VIN = VIN, nom; TA=25°C) All Vpk ⎯ 200 ⎯ mV
Load Change from Io= 50% to 100% of Io,max;
1μF ceramic// 10 μF tantalum
Peak Deviation
Settling Time (Vo<10% peak deviation) All ts ⎯ 25 ⎯ μs
(dIo/dt=2.5A/μs; VIN = VIN, nom; TA=25°C) All Vpk ⎯ 200 ⎯ mV
Load Change from Io= 100% to 50%of Io,max:
1μF ceramic// 10 μF tantalum
Peak Deviation
Settling Time (Vo<10% peak deviation) All ts ⎯ 25 ⎯ μs
GE Data Sheet
12V Austin MicroLynxTM 5A: Non-Isolated DC-DC Power Modules
10Vdc –14Vdc input; 0.75Vdc to 5.5Vdc output; 5A Output Current
May 6, 2013 ©2013 General Electric Company. All rights reserved. Page 4
Electrical Specifications (continued)
Parameter Device Symbol Min Typ Max Unit
Dynamic Load Response
(dIo/dt=2.5A/μs; V VIN = VIN, nom; TA=25°C) All Vpk ⎯ 50 ⎯ mV
Load Change from Io= 50% to 100% of Io,max;
Co = 2x150 μF polymer capacitors
Peak Deviation
Settling Time (Vo<10% peak deviation) All ts ⎯ 50 ⎯ μs
(dIo/dt=2.5A/μs; VIN = VIN, nom; TA=25°C) All Vpk ⎯ 50 ⎯ mV
Load Change from Io= 100% to 50%of Io,max:
Co = 2x150 μF polymer capacitors
Peak Deviation
Settling Time (Vo<10% peak deviation) All ts ⎯ 50 ⎯ μs
General Specifications
Parameter Min Typ Max Unit
Calculated MTBF (IO=IO, max, TA=25°C) 5,677,000 Hours
Weight ⎯ 2.8 (0.1) ⎯ g (oz.)
GE Data Sheet
12V Austin MicroLynxTM 5A: Non-Isolated DC-DC Power Modules
10Vdc –14Vdc input; 0.75Vdc to 5.5Vdc output; 5A Output Current
May 6, 2013 ©2013 General Electric Company. All rights reserved. Page 5
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
Remote On/Off Signal interface
(VIN=VIN, min to VIN, max; Open collector pnp or equivalent
Compatible, Von/off signal referenced to GND
See feature description section)
Logic Low (On/Off Voltage pin open - Module ON)
Von/Off All VIL — — 0.4 V
Ion/Off All IIL — — 10 μA
Logic High (Von/Off > 2.5V – Module Off)
Von/Off All VIH — — VIN, max V
Ion/off All IIH — — 1 mA
Turn-On Delay and Rise Times
(IO=IO, max , VIN = VIN, nom, TA = 25 oC, )
Case 1: On/Off input is set to Logic Low (Module
ON) and then input power is applied (delay from
instant at which VIN =VIN, min until Vo=10% of Vo,set)
All Tdelay — 3 — msec
Case 2: Input power is applied for at least one second
and then the On/Off input is set to logic Low (delay from
instant at which Von/Off=0.3V until Vo=10% of Vo, set)
All Tdelay — 3 — msec
Output voltage Rise time (time for Vo to rise from 10%
of Vo,set to 90% of Vo, set)
All Trise — 4 6 msec
Output voltage overshoot – Startup — 1 % VO, set
IO= IO, max; VIN = 10 to 14Vdc, TA = 25 oC
Overtemperature Protection All Tref ⎯ 140 ⎯ °C
(See Thermal Consideration section)
Input Undervoltage Lockout
Turn-on Threshold All 8.2 V
Turn-off Threshold All 8.0 V
GE Data Sheet
12V Austin MicroLynxTM 5A: Non-Isolated DC-DC Power Modules
10Vdc –14Vdc input; 0.75Vdc to 5.5Vdc output; 5A Output Current
May 6, 2013 ©2013 General Electric Company. All rights reserved. Page 6
Characteristic Curves
The following figures provide typical characteristics for the Austin MicroLynxTM 12V SMT modules at 25ºC.
EFFICIENCY, η (%)
70
72
74
76
78
80
82
84
86
0 12345
VIN= 14V
VIN = 12V
VIN = 10V
EFFICIENCY, η (%)
70
73
76
79
82
85
88
91
0 12345
VIN= 14V
VIN = 12V
VIN = 10V
OUTPUT CURRENT, IO (A) OUTPUT CURRENT, IO (A)
Figure 1. Converter Efficiency versus Output Current (Vout =
1.2Vdc).
Figure 4. Converter Efficiency versus Output Current (Vout =
2.5Vdc).
EFFICIENCY, η (%)
70
72
74
76
78
80
82
84
86
88
012345
VIN= 14V
VIN = 12V
VIN = 10V
EFFICIENCY, η (%)
70
73
76
79
82
85
88
91
0 12345
VIN= 14V
VIN = 12V
VIN = 10V
OUTPUT CURRENT, IO (A) OUTPUT CURRENT, IO (A)
Figure 2. Converter Efficiency versus Output Current (Vout =
1.5Vdc).
Figure 5. Converter Efficiency versus Output Current (Vout =
3.3Vdc).
EFFICIENCY, η (%)
70
72
74
76
78
80
82
84
86
88
0 12345
VIN= 14V
VIN = 12V
VIN = 10V
EFFICIENCY, η (%)
75
78
81
84
87
90
93
96
0 12345
VIN= 14V
VIN = 12V
VIN = 10V
OUTPUT CURRENT, IO (A) OUTPUT CURRENT, IO (A)
Figure 3. Converter Efficiency versus Output Current (Vout =
1.8Vdc).
Figure 6. Converter Efficiency versus Output Current (Vout =
5.0Vdc).
GE Data Sheet
12V Austin MicroLynxTM 5A: Non-Isolated DC-DC Power Modules
10Vdc –14Vdc input; 0.75Vdc to 5.5Vdc output; 5A Output Current
May 6, 2013 ©2013 General Electric Company. All rights reserved. Page 7
Characteristic Curves (continued)
The following figures provide typical characteristics for the MicroLynxTM 12V SMT modules at 25ºC.
INPUT CURRENT, IIN (A)
0
0.5
1
1. 5
2
2.5
3
3.5
4
6 8 10 12 14
Io = 0A
Io = 5A
Io = 2.5A
OUTPUT CURRENT, OUTPUT VOLTAGE
IO (A) (2A/div) VO (V) (100mV/div)
INPUT VOLTAGE, VIN (V) TIME
,
t
(
5
μ
s/div
)
Figure 7. Input voltage vs. Input Current
(Vout = 5.0Vdc).
Figure 10. Transient Response to Dynamic Load Change from
50% to 100% of full load (Vo = 3.3Vdc).
OUTPUT VOLTAGE
VO (V) (10mV/div)
OUTPUT CURRENT, OUTPUT VOLTAGE
IO (A) (2A/div) VO (V) (100mV/div)
TIME, t (2μs/div) TIME, t (5 μs/div)
Figure 8. Typical Output Ripple and Noise
(Vin = 12V dc, Vo = 0.75 Vdc, Io=5A).
Figure 11. Transient Response to Dynamic Load Change from
100% to 50% of full load (Vo = 3.3 Vdc).
OUTPUT VOLTAGE
VO (V) (10mV/div)
OUTPUT CURRENT, OUTPUT VOLTAGE
IO (A) (2A/div) VO (V) (50mV/div)
TIME, t (2μs/div) TIME, t (10μs/div)
Figure 9. Typical Output Ripple and Noise
(Vin = 12.0V dc, Vo = 5.0 Vdc, Io=5A).
Figure 12. Transient Response to Dynamic Load Change from
50% to 100% of full load (Vo = 5.0 Vdc, Cext = 2x150 μF
Polymer Capacitors).
GE Data Sheet
12V Austin MicroLynxTM 5A: Non-Isolated DC-DC Power Modules
10Vdc –14Vdc input; 0.75Vdc to 5.5Vdc output; 5A Output Current
May 6, 2013 ©2013 General Electric Company. All rights reserved. Page 8
Characteristic Curves (continued)
The following figures provide typical characteristics for the Austin MicroLynxTM 12V SMT modules at 25ºC.
OUTPUT CURRENT OUTPUTVOLTAGE
IO (A) (2A/div) VO (V) (50mV/div)
OUTPUT VOLTAGE, INPUT VOLTAGE Vo (V)
(2V/div) VIN (V) (5V/div)
TIME, t (10μs/div) TIME, t (1 ms/div)
Figure 13. Transient Response to Dynamic Load Change
from 100% of 50% full load (Vo = 5.0 Vdc, Cext = 2x150 μF
Pol
y
mer Ca
p
acitors).
Figure 16. Typical Start-Up with application of Vin with (Vin
= 12Vdc, Vo = 3.3Vdc, Io = 5A).
OUTPUT VOLTAGE On/Off VOLTAGE
VOV) (2V/div) VOn/off (V) (5V/div)
OUTPUT VOLTAGE On/Off VOLTAGE
VOV) (1V/div) VOn/off (V) (2V/div)
TIME, t (1 ms/div) TIME, t (1 ms/div)
Figure 14. Typical Start-Up Using Remote On/Off
(Vin = 12Vdc, Vo = 3.3Vdc, Io = 5.0A).
Figure 17 T
y
pical Start-Up using Remote On/off with
Prebias (Vin = 12Vdc, Vo = 1.8Vdc, Io = 1A, Vbias =1.0 Vdc).
OUTPUT VOLTAGE On/Off VOLTAGE
VOV) (1V/div) VOn/off (V) (2V/div)
OUTPUT CURRENT,
IO (A) (5A/div)
TIME, t (2 ms/div) TIME, t (20ms/div)
Figure 15. Typical Start-Up Using Remote On/Off with Low-
ESR external capacitors (7x150uF Polymer)
(Vin = 12Vdc
,
Vo = 3.3Vdc
,
Io = 5.0A
,
Co = 1050
μ
F).
Figure 18. Output short circuit Current (Vin = 12Vdc, Vo =
0.75Vdc).
GE Data Sheet
12V Austin MicroLynxTM 5A: Non-Isolated DC-DC Power Modules
10Vdc –14Vdc input; 0.75Vdc to 5.5Vdc output; 5A Output Current
May 6, 2013 ©2013 General Electric Company. All rights reserved. Page 9
Characteristic Curves (continued)
The following figures provide thermal derating curves for the Austin MicroLynxTM 12V SMT modules.
OUTPUT CURRENT, Io (A)
0
1
2
3
4
5
6
20 30 40 50 60 70 80 90
NC
0.5m/s (100 LFM)
OUTPUT CURRENT, Io (A)
0
1
2
3
4
5
6
20 30 40 50 60 70 80 90
NC
1.0m/s (200 LFM)
0.5m/s (100 LFM)
1.5m/s (300 LFM)
2.0m/s (400 LFM)
AMBIENT TEMPERATURE, TA OC AMBIENT TEMPERATURE, TA OC
Figure 19. Derating Output Current versus Local Ambient
Temperature and Airflow (Vin = 12Vdc, Vo=0.75Vdc).
Figure 22. Derating Output Current versus Local Ambient
Temperature and Airflow (Vin = 12Vdc, Vo=5.0 Vdc).
OUTPUT CURRENT, Io (A)
0
1
2
3
4
5
6
20 30 40 50 60 70 80 90
NC
1.0m/s (200 LFM)
0.5m/s (100 LFM)
AMBIENT TEMPERATURE, TA OC
Figure 20. Derating Output Current versus Local Ambient
Temperature and Airflow (Vin = 12Vdc, Vo=1.8 Vdc).
OUTPUT CURRENT, Io (A)
0
1
2
3
4
5
6
20 30 40 50 60 70 80 90
NC
1.0m/s (200 LFM)
0.5m/s (100 LFM)
AMBIENT TEMPERATURE, TA OC
Figure 21. Derating Output Current versus Local Ambient
Temperature and Airflow (Vin = 12Vdc, Vo=3.3 Vdc).
GE Data Sheet
12V Austin MicroLynxTM 5A: Non-Isolated DC-DC Power Modules
10Vdc –14Vdc input; 0.75Vdc to 5.5Vdc output; 5A Output Current
May 6, 2013 ©2013 General Electric Company. All rights reserved. Page 10
Test Configurations
TO OSCILLOSCOPE CURRENT PROBE
LTEST
1μH
BATTERY
CS 1000μF
Electrolytic
E.S.R.<0.1Ω
@ 20°C 100kHz
2x100μF
Tantalum
VIN(+)
COM
NOTE: Measure input reflected ripple current with a simulated
source inductance (LTEST) of 1μH. Capacitor CS offsets
possible battery impedance. Measure current as shown
above.
CIN
Figure 23. Input Reflected Ripple Current Test Setup.
NOTE: All voltage measurements to be taken at the module
terminals, as shown above. If sockets are used then
Kelvin connections are required at the module terminals
to avoid measurement errors due to socket contact
resistance.
V
O
(+)
COM
1uF .
RESISTIVE
LOAD
SCOPE
COPPER STRIP
GROUND PLANE
10uF
Figure 24. Output Ripple and Noise Test Setup.
VO
COM
VIN(+)
COM
RLOAD
Rco ntac t Rdistribution
Rco ntac t Rdistribution
Rco ntact
Rco ntact
Rdistribution
Rdistribution
VIN VO
NOTE: All voltage measurements to be taken at the module
terminals, as shown above. If sockets are used then
Kelvin connections are required at the module terminals
to avoid measurement errors due to socket contact
resistance.
Figure 25. Output Voltage and Efficiency Test Setup.
η =
VO. IO
VIN. IIN
x 100 %
Efficiency
Design Considerations
Input Filtering
The Austin MicroLynxTM 12V SMT module should be connected
to a low-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.
In a typical application, 2x47 µF low-ESR tantalum capacitors
(AVX part #: TPSE476M025R0100, 47µF 25V 100 mΩ ESR
tantalum capacitor) will be sufficient to provide adequate ripple
voltage at the input of the module. To minimize ripple voltage
at the input, low ESR ceramic capacitors are recommended at
the input of the module. Figure 26 shows input ripple voltage
(mVp-p) for various outputs with 2x47 µF tantalum capacitors
and with 2x 22 µF ceramic capacitor (TDK part #:
C4532X5R1C226M) at full load.
Input Ripple Voltage (mVp-p)
0
50
10 0
15 0
200
250
300
350
0123456
Ceramic
Tant al um
Output Voltage (Vdc)
Figure 26. Input ripple voltage for various output with 2x47
µF tantalum capacitors and with 2x22 µF ceramic capacitors
at the input (80% of Io,max).
GE Data Sheet
12V Austin MicroLynxTM 5A: Non-Isolated DC-DC Power Modules
10Vdc –14Vdc input; 0.75Vdc to 5.5Vdc output; 5A Output Current
May 6, 2013 ©2013 General Electric Company. All rights reserved. Page 11
Design Considerations (continued)
Output Filtering
The Austin MicroLynxTM 12V module is designed for low output
ripple voltage and will meet the maximum output ripple
specification with 1 µF ceramic and 10 µF polymer capacitors at
the output of the module. However, additional output filtering
may be required by the system designer for a number of
reasons. First, there may be a need to further reduce the output
ripple and noise of the module. Second, the dynamic response
characteristics may need to be customized to a particular load
step change.
To reduce the output ripple and improve the dynamic response
to a step load change, additional capacitance at the output can
be used. Low ESR polymer and ceramic capacitors are
recommended to improve the dynamic response of the module.
For stable operation of the module, limit the capacitance to less
than the maximum output capacitance as specified in the
electrical specification table.
Safety Considerations
For safety agency approval the power module must be
installed in compliance with the spacing and separation
requirements of the end-use safety agency standards, i.e., UL
60950-1, CSA C22.2 No. 60950-1-03, and VDE 0850:2001-12
(EN60950-1) Licensed.
For the converter output to be considered meeting the
requirements of safety extra-low voltage (SELV), the input must
meet SELV requirements. The power module has extra-low
voltage (ELV) outputs when all inputs are ELV.
The input to these units is to be provided with a fast-acting fuse
with a maximum rating of 6A in the positive input lead.
GE Data Sheet
12V Austin MicroLynxTM 5A: Non-Isolated DC-DC Power Modules
10Vdc –14Vdc input; 0.75Vdc to 5.5Vdc output; 5A Output Current
May 6, 2013 ©2013 General Electric Company. All rights reserved. Page 12
Feature Description
Remote On/Off
The Austin MicroLynxTM SMT 12V power modules feature an
On/Off pin for remote On/Off operation of the module. If not
using the remote On/Off pin, leave the pin open (module will be
On). The On/Off pin signal (Von/Off) is referenced to ground. To
switch module on and off using remote On/Off, connect an
open collector pnp transistor between the On/Off pin and the
VIN pin (See Figure 27).
When the transistor Q1 is in the OFF state, the power module is
ON (Logic Low on the On/Off pin of the module) and the
maximum Von/off of the module is 0.4 V. The maximum
allowable leakage current of the transistor when Von/off = 0.4V
and VIN = VIN,max is 10μA. During a logic-high when the
transistor is in the active state, the power module is OFF.
During this state VOn/Off =10 - 14V and the maximum IOn/Off =
1mA.
VIN(+)
GND
Enable
20k
20k
On/Off
Pin
Css
IOn/Off
Lynx-series Module
Figure 27. Remote On/Off Implementation
Remote On/Off can also be implemented using open-collector
logic devices with an external pull-up resistor. Figure 28a
shows the circuit configuration using this approach. Pull-up
resistor, Rpull-up, for the configuration should be 68k (+/-5%) for
proper operation of the module over the entire temperature
range.
Q1
R1
R2
Q2 CSS
GND
PWM Enable
ON/OFF
VIN+
ON/OFF
_
+
V
I
MODULE
pull-up
R
ON/OFF
Figure 27a. Remote On/Off Implementation using logic-level
devices and an external pull-up resistor
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. The typical average output current during
hiccup is 2A.
Input Undervoltage Lockout
At input voltages below the input undervoltage lockout limit,
module operation is disabled. The module will begin to operate
at an input voltage above the undervoltage lockout turn-on
threshold.
Overtemperature Protection
To provide over temperature protection in a fault condition, the
unit relies upon the thermal protection feature of the controller
IC. The unit will shutdown if the thermal reference point Tref2,
(see Figure 31) exceeds 140oC (typical), but the thermal
shutdown is not intended as a guarantee that the unit will
survive temperatures beyond its rating. The module will
automatically restarts after it cools down.
GE Data Sheet
12V Austin MicroLynxTM 5A: Non-Isolated DC-DC Power Modules
10Vdc –14Vdc input; 0.75Vdc to 5.5Vdc output; 5A Output Current
May 6, 2013 ©2013 General Electric Company. All rights reserved. Page 13
Feature Descriptions (continued)
Output Voltage Programming
The output voltage of the Austin MicroLynxTM 12V can be
programmed to any voltage from 0.75Vdc to 5.5Vdc by
connecting a resistor (shown as Rtrim in Figure 28) between
Trim and GND pins of the module. Without an external resistor
between Trim and GND pins, the output of the module will be
0.7525Vdc. To calculate the value of the trim resistor, Rtrim for
a desired output voltage, use the following equation:
Ω
−
−
=1000
7525.0
10500
Vo
Rtrim
Rtrim is the external resistor in Ω
Vo is the desired output voltage
For example, to program the output voltage of the Austin
MicroLynxTM 12V module to 1.8V, Rtrim is calculated as follows:
−
−
=1000
7525.08.1
10500
Rtrim
Ω= kRtrim 024.9
V
O
(+)
TRIM
GND
R
trim
LOAD
V
IN
(+)
ON/OFF
Figure 28. Circuit configuration to program output voltage
using an external resistor
Austin MicroLynxTM 12Vdc can also be programmed by applying
a voltage between TRIM and GND pins (Figure 29). The following
equation can be used to determine the value of Vtrim needed to
obtain a desired output voltage Vo:
{}()
7525.00667.07.0 −×−= VoVtrim
For example, to program the output voltage of a MicroLynxTM
module to 3.3 Vdc, Vtrim is calculated as follows:
{}
)7525.03.30667.07.0( −×−=Vtrim
VVtrim 530.0=
VO(+)
TRIM
GND
V
trim
LOAD
VIN(+)
ON/OFF
+
-
Figure 29. Circuit Configuration for programming Output
voltage using external voltage source
Table 1 provides Rtrim values for most common output
voltages. Table 2 provides values of external voltage
source, Vtrim for various output voltage.
Table 1
VO, set (V) Rtrim (KΩ)
0.7525 Open
1.2 22.46
1.5 13.05
1.8 9.024
2.5 5.009
3.3 3.122
5.0 1.472
Table 2
VO, set (V) Vtrim (V)
0.7525 Open
1.2 0.670
1.5 0.650
1.8 0.630
2.5 0.583
3.3 0.530
5.0 0.4166
Using 1% tolerance trim resistor, set point tolerance of ±2% is
achieved as specified in the electrical specification. The POL
Programming Tool, available at www.lineagepower.com under
the Design Tools section, helps determine the required external
trim resistor needed for a specific output voltage.
GE Data Sheet
12V Austin MicroLynxTM 5A: Non-Isolated DC-DC Power Modules
10Vdc –14Vdc input; 0.75Vdc to 5.5Vdc output; 5A Output Current
May 6, 2013 ©2013 General Electric Company. All rights reserved. Page 14
Feature Descriptions (continued)
The amount of power delivered by the module is defined as
the voltage at the output terminals multiplied by the output
current. When using the trim feature, the output voltage of
the module can be increased, which at the same output
current would increase the power output of the module.
Care should be taken to ensure that the maximum output
power of the module remains at or below the maximum
rated power (Pmax = Vo,set x Io,max).
Voltage Margining
Output voltage margining can be implemented in the Austin
MicroLynxTM modules by connecting a resistor, Rmargin-up,
from Trim pin to ground pin for margining-up the output
voltage and by connecting a resistor, Rmargin-down, from Trim
pin to Output pin. Figure 30 shows the circuit configuration
for output voltage margining. The POL Programming Tool,
available at www.lineagepower.com under the Design Tools
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
Austin Lynx or
Lynx II Series
GND
Trim
Q1
Rtrim
Rmargin-up
Q2
Rmargin-down
Figure 30. Circuit Configuration for margining Output
voltage.
GE Data Sheet
12V Austin MicroLynxTM 5A: Non-Isolated DC-DC Power Modules
10Vdc –14Vdc input; 0.75Vdc to 5.5Vdc output; 5A Output Current
May 6, 2013 ©2013 General Electric Company. All rights reserved. Page 15
Thermal Considerations
Power modules operate in a variety of thermal environments;
however, sufficient cooling should 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 32. Note that the
airflow is parallel to the long axis of the module as shown in
figure 31. The derating data applies to airflow in either
direction of the module’s long axis.
Air Flow
Tref2
Top View
Bottom View
Tref1 (inductor winding)
Figure 31. Tref Temperature measurement location.
The thermal reference points, Tref 1 and Tref2 used in the
specifications of thermal derating curves are shown in Figure
31. For reliable operation these temperatures should not
exceed 125oC.
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.
Figure 32. Thermal Test Set-up.
Heat Transfer via Convection
Increased airflow over the module enhances the heat transfer
via convection. Thermal derating curves showing the
maximum output current that can be delivered by various
module versus local ambient temperature (TA) for natural
convection and up to 1m/s (200 ft./min) are shown in the
Characteristics Curves section.
Layout Considerations
Copper paths must not be routed beneath the power module.
For additional layout guide-lines, refer to FLTR100V10
application note.
A
ir
flow
x
Power Module
W
ind Tunnel
PWBs
7.24_
(0.285)
76.2_
(3.0)
Probe Location
for measuring
airflow and
ambient
temperature
25.4_
(1.0)
GE Data Sheet
12V Austin MicroLynxTM 5A: Non-Isolated DC-DC Power Modules
10Vdc –14Vdc input; 0.75Vdc to 5.5Vdc output; 5A Output Current
May 6, 2013 ©2013 General Electric Company. All rights reserved. Page 16
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.)
Co-planarity (max): 0.102 [0.004]
PIN FUNCTION
1 On/Off
2 VIN
3 GND
4 Trim
5 VOUT
GE Data Sheet
12V Austin MicroLynxTM 5A: Non-Isolated DC-DC Power Modules
10Vdc –14Vdc input; 0.75Vdc to 5.5Vdc output; 5A Output Current
May 6, 2013 ©2013 General Electric Company. All rights reserved. Page 17
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 FUNCTION
1 On/Off
2 VIN
3 GND
4 Trim
5 VOUT
GE Data Sheet
12V Austin MicroLynxTM 5A: Non-Isolated DC-DC Power Modules
10Vdc –14Vdc input; 0.75Vdc to 5.5Vdc output; 5A Output Current
May 6, 2013 ©2013 General Electric Company. All rights reserved. Page 18
Packaging Details
The Austin MicroLynxTM 12V SMT versions are supplied in tape & reel as standard. Modules are shipped in quantities of 400
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”)
Width 44.0 mm (1.73”)
GE Data Sheet
12V Austin MicroLynxTM 5A: Non-Isolated DC-DC Power Modules
10Vdc –14Vdc input; 0.75Vdc to 5.5Vdc output; 5A Output Current
May 6, 2013 ©2013 General Electric Company. All rights reserved. Page 19
Surface Mount Information
Pick and Place
The Austin MicroLynxTM 12V SMT 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
placing. The label meets all the requirements for surface
mount processing, as well as safety standards and is able to
withstand maximum reflow temperature. The label also
carries product information such as product code, serial
number and location of manufacture.
Figure 33. Pick and Place Location.
Nozzle Recommendations
The module weight has been kept to a minimum by using
open frame construction. Even so, these modules have a
relatively large mass when compared to conventional SMT
components. Variables such as nozzle size, tip style, vacuum
pressure and pick & placement speed should be considered
to optimize this process. The minimum recommended
nozzle diameter for reliable operation is 3mm. The maximum
nozzle outer diameter, which will safely fit within the
allowable component spacing, is 8 mm max.
Tin Lead Soldering
The Austin MicroLynxTM 12V SMT power modules are lead
free modules and can be soldered either in a lead-free solder
process or in a conventional Tin/Lead (Sn/Pb) process. It is
recommended that the customer review data sheets in order
to customize the solder reflow profile for each application
board assembly. The following instructions must be
observed when soldering these units. Failure to observe
these instructions may result in the failure of or cause
damage to the modules, and can adversely affect long-term
reliability.
In a conventional Tin/Lead (Sn/Pb) solder process peak
reflow temperatures are limited to less than 235oC. Typically,
the eutectic solder melts at 183oC, wets the land, and
subsequently wicks the device connection. Sufficient time
must be allowed to fuse the plating on the connection to
ensure a reliable solder joint. There are several types of SMT
reflow technologies currently used in the industry. These
surface mount power modules can be reliably soldered using
natural forced convection, IR (radiant infrared), or a
combination of convection/IR. For reliable soldering the
solder reflow profile should be established by accurately
measuring the modules CP connector temperatures.
REFLOW TEMP (°C)
0
50
10 0
15 0
200
250
300
Preheat zone
max 4
o
Cs
-1
So ak zone
30-240s
Heat zone
max 4
o
Cs
-1
Peak Temp 235
o
C
Cooling
zo ne
1- 4
o
Cs
-1
Tlim above
205oC
REFLOW TIME (S)
Figure 34. Reflow Profile for Tin/Lead (Sn/Pb) process.
MAX TEMP SOLDER (°C)
200
205
210
215
220
225
230
235
240
0 10 203040 5060
Figure 35. Time Limit Curve Above 205oC for Tin/Lead
(Sn/Pb) process.
GE Data Sheet
12V Austin MicroLynxTM 5A: Non-Isolated DC-DC Power Modules
10Vdc –14Vdc input; 0.75Vdc to 5.5Vdc output; 5A Output Current
May 6, 2013 ©2013 General Electric Company. All rights reserved. Page 20
Surface Mount Information (continued)
Lead Free Soldering
The –Z version Austin MicroLynx 12V SMT modules are lead-
free (Pb-free) and RoHS compliant and are both forward and
backward compatible in a Pb-free and a SnPb soldering
process. Failure to observe the instructions below may result
in the failure of or cause damage to the modules and can
adversely affect long-term reliability.
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. 36.
MSL Rating
The Austin MicroLynx 12V SMT modules have a MSL rating of
2a..
Storage and Handling
The recommended storage environment and handling
procedures for moisture-sensitive surface mount packages is
detailed in J-STD-033 Rev. A (Handling, Packing, Shipping and
Use of Moisture/Reflow Sensitive Surface Mount Devices).
Moisture barrier bags (MBB) with desiccant are required for
MSL ratings of 2 or greater. These sealed packages should
not be broken until time of use. Once the original package is
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.
Post Solder Cleaning and Drying Considerations
Post solder cleaning is usually the final circuit-board
assembly process prior to electrical board testing. The result
of inadequate cleaning and drying can affect both the
reliability of a power module and the testability of the
finished circuit-board assembly. For guidance on appropriate
soldering, cleaning and drying procedures, refer to Board
Mounted Power Modules: Soldering and Cleaning Application
Note (AN04-001).
Per J-STD-020 Rev. C
0
50
100
150
200
250
300
Reflow Time (Seconds)
Reflow Temp (°C)
Heating Zone
1°C/Second
Peak Temp 260°C
* Min. Time Above 235°C
15 Seconds
*Time Above 217°C
60 Seconds
Cooling
Zone
Figure 36. Recommended linear reflow profile using
Sn/Ag/Cu solder.
GE Data Sheet
12V Austin MicroLynxTM 5A: Non-Isolated DC-DC Power Modules
10Vdc –14Vdc input; 0.75Vdc to 5.5Vdc output; 5A Output Current
Contact Us
For more information, call us at
USA/Canada:
+1 888 546 3243, or +1 972 244 9288
Asia-Pacific:
+86.021.54279977*808
Europe, Middle-East and Africa:
+49.89.74423-206
India:
+91.80.28411633
www.ge.com/powerelectronics
May 6, 2013 ©2013 General Electric Company. All rights reserved. Version 1.53
Ordering Information
Please contact your GE representative for pricing, availability and optional features.
Table 3. Device Codes
Device Code
Input
Voltage
Range
Output
Voltage
Output
Current
Efficiency
3.3V@ 6A
On/Off
Logic
Connector
Type Comcodes
AXA005A0X-SR 10 – 14Vdc 0.75 – 5.5Vdc 5 A 89.0% Negative SMT 108981622
AXA005A0X-SRZ 10 – 14Vdc 0.75 – 5.5Vdc 5 A 89.0% Negative SMT 108995172
-Z refers to RoHS compliant versions
