Data Sheet
Austin SuperLynxTM II 12V SMT Non-isolated Power Modules:
8.3 – 14Vdc Input; 0.75Vdc to 5.5Vdc Output;16A output current
November 19, 2008
Mounted Power Modules” for a detailed discussion of
thermal aspects including maximum device
temperatures.
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 33. Note that the airflow is parallel to
the long axis of the module as shown in figure 32. The
derating data applies to airflow in either direction of the
module’s long axis.
25.4_
(1.0)
Wind Tunnel
PWBs
Power Module
Air Flow
76.2_
(3.0)
T
ref1 (inductor winding)
x
Probe Location
for measuring
airflow and
7.24_
(0.285)
ambient
temperature
Air
flow
Figure 33. Thermal Test Set-up.
Top View
Heat Transfer via Convection
T
ref2
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.
Bottom View
Figure 32. T
Temperature measurement location.
ref
The thermal reference points, Tref 1 and Tref2 used in the
specifications of thermal derating curves are shown in
Figure 32. 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-
LINEAGE POWER
15
LINEAGEPOWER [ LINEAGE POWER CORPORATION ]
