SSTW003A0A Datasheet, PDF (8/15 Pages) Lineage Power Corporation – 36-75Vdc Input; 5.0Vdc, 3A, 15W Output

GE
Data Sheet
SSTW003A0A Barracuda™ Series; DC-DC Converter Power Modules
36-75Vdc Input; 5.0Vdc, 3A, 15W Output
Feature Descriptions (continued)
Vin+
Vout+
ON/OFF
TRIM
Vin-
Vout-
R_adj-up
R_LOAD
Figure 12. Circuit Configuration to Increase Output Voltage.
The SSTW power modules have a fixed current-limit set point.
Therefore, as the output voltage is adjusted down, the
available output power is reduced.
Trim Examples
For SSTW003A0A, nominal 5.0V module. To trim module down
to 4.90V:
Radj

down




(4.9  2.5)  5110
(5.0  4.9)

2050_{}

Radj  down  120,590
Thermal Considerations
The 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, using automated
thermo-couple instrumentation to monitor key component
temperatures: FETs, diodes, control ICs, magnetic cores,
ceramic capacitors, opto-isolators, and module pwb
conductors, while controlling the ambient airflow rate and
temperature. For a given airflow and ambient temperature, the
module output power is increased, until one (or more) of the
components reaches its maximum derated operating
temperature, as defined in IPC-9592A. This procedure is then
repeated for a different airflow or ambient temperature until a
family of module output derating curves is obtained.
Figure 13. Thermal Test Setup .
LOCAL AMBIENT TEMPERATURE, TA (C)
Figure 14. Output Current Derating for the Open Frame
SSTW003A0A in the Transverse Orientation; Airflow
Direction from Vin(-) to Vin(+); Vin = 48V.
The thermal reference point, Tref used in the specifications is
shown in Figure 15. For reliable operation this temperature
should not exceed 111^oC.
March 26, 2013
Figure 15. Tref Temperature Measurement Location.
Heat Transfer via Convection
Increased airflow over the module enhances the heat transfer
via convection. Derating figures showing the maximum output
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