Data Sheet
Austin SuperlynxTM II SIP Non-isolated Power Modules:
March 31, 2008
2.4 – 5.5Vdc input; 0.75Vdc to 3.3Vdc Output; 16A output current
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
34. Note that the airflow is parallel to the long axis of the
module as shown in figure 33. The derating data applies
to airflow in either direction of the module’s long axis.
Po we r Mo d ule
76.2_
(3.0)
x
Probe Location
for measuring
airflow and
ambient
Airflow
5.97_
(0.235)
temperature
Air
flow
Figure 34. Thermal Test Set-up.
Top View
Tref
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.
Figure 33. T
ref
Temperature measurement location.
The thermal reference point, Tref used in the
specifications is shown in Figure 33. 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
15
LINEAGEPOWER [ LINEAGE POWER CORPORATION ]
