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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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QSW025A0B1Z 데이터시트(PDF) 9 Page - Lineage Power Corporation |
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QSW025A0B1Z 데이터시트(HTML) 9 Page - Lineage Power Corporation |
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9 / 16 page  Data Sheet February 16, 2009 QSW025A0B Series Power Modules; DC-DC Converters 36 – 75Vdc Input; 12Vdc Output; 25A Output Current LINEAGE POWER 9 Feature Descriptions (continued) Thermal Considerations The power modules operate in a variety of thermal environments and sufficient cooling should be provided to help ensure reliable operation. Thermal 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. Heat-dissipating components are mounted on the top side of the module. Heat is removed by conduction, convection and radiation to the surrounding environment. Proper cooling can be verified by measuring the thermal reference temperature (THx). Peak temperature (THx) occurs at the position indicated in Figure 13. For reliable operation this temperature should not exceed the listed temperature threshold. TH1 and TH2 shall not exceed 125°C. Figure 13. Location of the thermal reference temperature TH. TH3 shall not exceed 110°C. Figure 14. Location of the thermal reference temperature TH3 for Baseplate module. The output power of the module should not exceed the rated power for the module as listed in the Ordering Information table. Although the maximum THx temperature of the power modules is 110 °C - 125 °C, you can limit this temperature to a lower value for extremely high reliability. 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. Heat Transfer via Convection Increased airflow over the module enhances the heat transfer via convection. The thermal derating figures (15-24) show the maximum output current that can be delivered by each module in the respective orientation without exceeding the maximum THx temperature versus local ambient temperature (TA) for air flows of, Natural Convection, 1 m/s (200 ft./min), 2 m/s (400 ft./min) and 3 m/s (600 ft./min). The use of Figures 15 - 24 are shown in the following example: Example What is the minimum airflow necessary for a QSW025A0B operating at VI = 48 V, an output current of 17A, and a maximum ambient temperature of 70 °C in transverse orientation. Solution: Given: Vin= 48V, IO = 17A, TA = 70 °C Determine required airflow (V) (Use Figure 15): V = 1.5 m/sec. (300LFM) or greater. |
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