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ASD75-24S12EB Datasheet(PDF) 6 Page - Astrodyne Corporation |
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ASD75-24S12EB Datasheet(HTML) 6 Page - Astrodyne Corporation |
6 / 8 page 75 Watt, High Density, Eighth Brick DC/DC Converter ASD75EB series WWW.ASTRODYNETDI.COM ASTRODYNE USA: 1-800-823-8082 ASTRODYNE PACIFIC: 886-2-26983458 Over Temperature Protection The ASD75EB series modules are protected from thermal overload by an internal over temperature protection IC. When the PCB temperature sense point reaches 125°C, the converter will shut down immediately. The converter will attempt to restart when the temperature has dropped at least 10°C below the Over Temperature threshold. Thermal Considerations The ASD75EB series are designed to operate in a wide range of thermal environments. However, enough cooling should be provided to ensure reliable performance. Heat is removed from the converter in 3 ways: conduction, convection and radiation. Improved cooling by convection can be done by increasing the airflow through the module. The available load current for a given ambient air temperature is in the de-rating curves section. The test is done using the test fixture shown in figure 5. Figure 5: Thermal Test Fixture Pin3 Pin1 Pin4 Pin8 Proper cooling can be verified by monitoring the temperature of the critical components of the power stage. Each of the selected critical components was monitored by using thermocouple. The generation of the thermal de-rating curves involves extensive thermal testing at different combinations of input voltage, ambient air temperature, load current and airflow with the given test fixture. However, the final temperature of the module in the final system will depend again on several factors, including host PCB size, number of layers, and copper weight, airflow direction and turbulence, operating ambient temperatures, etc… It is highly recommended to verify the thermal performance of the converter when included in the end system. ASD75 Figure 5: Thermal Text Fixture |
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