Austin LynxTM SMT Non-Isolated dc-dc Power Modules:
3.0 Vdc - 5.5 Vdc Input, 0.9 Vdc - 3.3 Vdc Output, 10 A
Data Sheet
March 28, 2008
Thermal Considerations
The power module operates in a variety of thermal environ-
ments; however, sufficient cooling should be provided to
help ensure reliable operation of the unit. Heat is removed
by conduction, convection, and radiation to the surrounding
environment.
25.4
(1.0)
Wind Tunnel
PWBs
Power Module
The thermal data presented is based on measurements
taken in a wind tunnel. The test setup shown in Figure 25
was used to collect data for Figures 26
and 27. Note that the airflow is parallel to the short axis of
the module as shown in Figure 24. The derating data applies
to airflow along either direction of the module’s short axis.
76.2
(3.0)
x
Pin 6
Probe Location
for measuring
airflow and
8.3
(0.33)
ambient
temperature
Q2
Q1
Air
flow
Figure 25. Thermal Test Setup.
AIRFLOW
12
10
8
Figure 24. Temperature Measurement Location.
2.0 m/s (400 ft./min.)
1.0 m/s (200 ft./min.)
0.5 m/s (100 ft./min.)
6
4
2
0
The temperature at either location should not exceed
110 °C. The output power of the module should not exceed
the rated power for the module (VO, set x IO, max).
NATURAL CONVECTION
Convection Requirements for Cooling
20
30
40
50
60
70
80
90
To predict the approximate cooling needed for the module,
refer to the Power Derating curves in Figures 26 and 27.
Ambient Temperature T
A
(˚C)
These derating curves are approximations of the ambient
temperatures and airflows required to keep the power mod-
ule temperature below its maximum rating. Once the module
is assembled in the actual system, the module’s temperature
should be checked as shown in Figure 24 to ensure it does
not exceed 110 °C.
Figure 26. Typical Power Derating Vs Output Current
for 3.3 VIN.
8
7
6
5
4
3
2
1
0
2.0 m/s (400 ft./min.)
1.0 m/s (200 ft./min.)
0.5 m/s (100 ft./min.)
Proper cooling can be verified by measuring the power mod-
ule’s temperature at Q1-pin 6 and Q2-pin 6 as shown in Fig-
ure 24.
NATURAL CONVECTION
20
30
40
50
60
70
80
90
AMBIENT TEMPERATURE, T
A
(˚C)
Figure 27. Typical Power Derating Vs Output Current
for 5.0VIN.
Lineage Power
12
LINEAGEPOWER [ LINEAGE POWER CORPORATION ]
