GE Industrial Solutions 6A Digital PicoDLynx - Manual (Page 33)

GE
Data Sheet
6A Digital PicoDLynx TM : Non-Isolated DC-DC Power Modules
3Vdc –14.4Vdc input; 0.45Vdc to 5.5Vdc output; 6A Output Current
April 29, 2013 ©2013 General Electric Company. All rights reserved. Page 33
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 49.
The preferred airflow direction for the module is in Figure 50.
Air
flow
x
Power Module
Wind Tunnel
PWBs
12.7_
(0.50)
76.2_
(3.0)
Probe Location
for measuring
airflow and
ambient
temperature
25.4_
(1.0)
Figure 49. Thermal Test Setup.
The thermal reference points, T
ref
used in the specifications
are also shown in Figure 50. For reliable operation the
temperatures at these points should not exceed 120°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 50. Preferred airflow direction and location of hot-
spot of the module (Tref).