Data Sheet
12V Austin LynxTM SMT Non-isolated Power Modules Programmable:
10 – 14Vdc input; 0.75Vdc to 5.5Vdc Output; 10A output current
April 8, 2008
Thermal Considerations
Power modules operate in a variety of thermal
environments; however, sufficient cooling should always
be provided to help ensure reliable operation.
25.4_
(1.0)
Wind Tunnel
PWBs
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.
Powe r Mo d ule
76.2_
(3.0)
Tref
Top View
x
Pro b e Lo c a tio n
for measuring
airflow and
ambient
8.3_
(0.325)
temperature
Air
flow
Air Flow
Figure 32. Thermal Test Set-up.
Figure 31. T
ref
Temperature measurement location.
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 (TA) for airflow
conditions ranging from natural convection and up to
2m/s (400 ft./min) are shown in the Characteristics
Curves section.
The thermal reference point, Tref used in the
specifications is shown in Figure 31. For reliable
operation this temperature 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.
LINEAGE POWER
14
LINEAGEPOWER [ LINEAGE POWER CORPORATION ]
