GE Industrial Solutions 12V AustinLynx 10A - Manual (Page 14)

GE
Data Sheet
12V AustinLynx TM 10A: Non-Isolated DC-DC Power Modules,Programmable
10Vdc –14Vdc input; 0.75Vdc to 5.5Vdc output; 10A Output Current
May 8, 2013 ©2013 General Electric Company. All rights reserved. Page 14
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 32. Note that the airflow is
parallel to the short axis of the module as shown in figure 31.
The derating data applies to airflow in either direction of the
module’s short axis.
Air Flow
T
ref
Top View
Figure 31. Tref Temperature measurement location.
The thermal reference point, T
ref
used in the specifications is
shown in Figure 31. For reliable operation this temperature
should not exceed 115
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 at different
local ambient temperatures (T
A
) for airflow conditions ranging
from natural convection and up to 2m/s (400 ft./min) are
shown in the Characteristics Curves section.
Air
flow
x
Power Module
Wind Tunnel
PWBs
8.3_
(0.325)
76.2_
(3.0)
Probe Location
for measuring
airflow and
ambient
temperature
25.4_
(1.0)