GE Industrial Solutions Austin Microlynx SIP - Manual (Page 15)

Data Sheet
July 2, 2010 Austin MicroLynx TM SIP Non-isolated Power Modules:
3 – 5.5Vdc input; 0.75Vdc to 3.63Vdc Output; 5A output current
LINEAGE POWER 15
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.
Air Flow
T
ref2
Top View
Bottom View
T
ref1 (inductor winding)
Figure 32. Tref Temperature measurement location.
The thermal reference point, T
ref 1
used in the
specifications of thermal derating curves is shown in
Figure 32. For reliable operation this temperature should
not exceed 125
o 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 33. Thermal Test Set-up.
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 by
various module versus local ambient temperature (T
A
) for
natural convection and up to 1m/s (200 ft./min) are shown
in the Characteristics Curves section.
Layout Considerations
Copper paths must not be routed beneath the power
module. For additional layout guide-lines, refer to
FLTR100V10 application note.
Air
flow
x
Power Module
Wind Tunnel
PWBs
7.24_
(0.285)
76.2_
(3.0)
Probe Location
for measuring
airflow and
ambient
temperature
25.4_
(1.0)