Data Sheet
12V TLynxTM: Non-isolated DC-DC Power Modules
July 24, 2009
4.5 – 14Vdc input; 0.69Vdc to 5.5Vdc output; 20A 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.
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 49. The preferred airflow direction
for the module is in Figure 50. The derating data
applies to airflow in either direction of the module’s
long axis.
Figure 50. Preferred airflow direction and location
of hot-spot of the module (Tref).
25.4_
Wind Tunnel
PWBs
(1.0)
Modules marked ruggedized with a “D” suffix operate
up to an ambient of 105°C. For the remaining types
de-rating curves for individual output voltages meet
existing specifications up to 85°C.
Power Module
76.2_
(3.0)
x
Probe Location
for measuring
airflow and
12.7_
(0.50)
ambient
temperature
Air
flow
Figure 49. Thermal Test Setup.
The thermal reference points, Tref used in the
specifications are also shown in Figure 50. For reliable
operation the temperatures at these points 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-
Mounted Power Modules” for a detailed discussion of
thermal aspects including maximum device
temperatures.
LINEAGE POWER
19
LINEAGEPOWER [ LINEAGE POWER CORPORATION ]
