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SHHD003A0A Datasheet(PDF) 8 Page - List of Unclassifed Manufacturers |
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SHHD003A0A Datasheet(HTML) 8 Page - List of Unclassifed Manufacturers |
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8 / 16 page  GE Data Sheet SHHD003A0A Hammerhead Series; DC-DC Converter Power Modules 18-75Vdc Input; 5.0Vdc, 3A, 15W Output June 26, 2013 ©2012 General Electric Company. All rights reserved. Page 8 Feature Descriptions (continued) Vout+ TRIM Vout- Radj-up RLOAD Vin+ ON/OFF Vin- Figure 12. Circuit Configuration to Increase Output Voltage. The SHHD 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 SHHD003A0A, nominal 5.0V module. To trim module down to 4.90V: 2050 ) 9 . 4 0 . 5 ( 5110 ) 5 . 2 9 . 4 ( down adj R 590 , 120 down adj R 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 SHHD003A0A in the Transverse Orientation; Airflow Direction from Vin(-) to Vin(+); Vin = 24V. LOCAL AMBIENT TEMPERATURE, TA (C) Figure 15. Output Current Derating for the Open Frame SHHD003A0A 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 16. For reliable operation this temperature should not exceed 111oC. |
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