Data Sheet
Austin LynxTM II SMT Non-isolated Power Modules:
August 28, 2009
2.4 – 5.5Vdc input; 0.75Vdc to 3.63Vdc Output; 10A output current
Thermal Considerations
25.4_
(1.0)
Wind Tunnel
PWBs
Power modules operate in a variety of thermal
environments; however, sufficient cooling should always
be provided to help ensure reliable operation.
Power Mod ule
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 35. Note that the airflow is parallel to
the long axis of the module as shown in figure 34. The
derating data applies to airflow in either direction of the
module’s long axis.
76.2_
(3.0)
x
Probe Location
for measuring
airflow and
ambient
Top View
8.3_
(0.325)
temperature
Air
flow
Figure 35. Thermal Test Set-up.
Heat Transfer via Convection
Tref
Bottom View
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 temperature (TA) for
airflow conditions ranging from natural convection and
up to 2m/s (400 ft./min) are shown in the Characteristics
Curves section.
Air Flow
Figure 34. T
ref
Temperature measurement location.
The thermal reference point, Tref used in the
specifications is shown in Figure 34. For reliable
operation this temperature should not exceed 115 oC.
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 ]
