GE Industrial Solutions 12V Austin MicroLynx 5A - Manual (Page 15)

GE
Data Sheet
12V Austin MicroLynx TM 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
T
ref2
Top View
Bottom View
T
ref1 (inductor winding)
Figure 31. Tref Temperature measurement location.
The thermal reference points, T
ref 1
and T
ref2
used in the
specifications of thermal derating curves are shown in Figure
31. For reliable operation these temperatures should not
exceed 125
o C.
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 (T
A
) 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.
Air
flow
x
Power Module
Wind Tunnel
PWBs
7.24_
(0.285)
76.2_
(3.0)
Probe Location
for measuring
airflow and
ambient
temperature
25.4_
(1.0)