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QBW018A0B1 데이터시트(PDF) 11 Page - Lineage Power Corporation |
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QBW018A0B1 데이터시트(HTML) 11 Page - Lineage Power Corporation |
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11 / 16 page  Data Sheet March 27, 2008 QBW018A0B Series Power Modules, DC - DC Converters: 36 – 75Vdc Input; 12Vdc Output; 18A Output Current LINEAGE POWER 11 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 (TH). Peak temperature (TH) occurs at the position indicated in Figure 13. For reliable operation this temperature should not exceed the listed temperature threshold. Figure 31. Tref Temperature measurement location. 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 TH temperature of the power modules is 110 °C - 115 °C, you can limit this temperature to a lower value for extremely high reliability. Heat Transfer via Convection Increased airflow over the module enhances the heat transfer via convection. The thermal derating figures (14-17) show the maximum output current that can be delivered by each module in the respective orientation without exceeding the maximum TH temperature versus local ambient temperature (TA) for air flows of 1 m/s (200 ft./min) and 2m/s (400 ft./min). Note that the natural convection condition was measured at 0.05 m/s to 0.1 m/s (10ft./min. to 20 ft./min.); however, systems in which these power modules may be used typically generate natural convection airflow rates of 0.3 m/s (60 ft./min.) due to other heat dissipating components in the system. The use of Figures 14 - 15 are shown in the following example: Example What is the minimum airflow necessary for a QBW018A0B operating at VI = 48 V, an output current of 12A, and a maximum ambient temperature of 70 °C in transverse orientation. Solution: Given: VI = 48V, Io = 12A, TA = 70 °C Determine required airflow (V) (Use Figure 14): V = T1 m/sec. ( 200 ft./min.) or greater. LOCAL AMBIENT TEMPERATURE, TA (°C) Figure 14. Output Current Derating for the QBW018A0B in the Transverse Orientation with no baseplate; Airflow Direction from Vin(+) to Vin(-); Vin = 48V 0 5 10 15 20 0 20406080 100 1m/s (200LFM) 3m/s (600LFM) 2m/s (400LFM) LOCAL AMBIENT TEMPERATURE, TA (°C) Figure 15. Output Current Derating for the QBW18A0B (Vo = 12V) in the Transverse Orientation with baseplate; Airflow Direction from Vin(+) to Vin(-); Vin = 48V 0 5 10 15 20 0 20406080 100 1m/s (200LFM) 3m/s (600LFM) 2m/s (400LFM) |
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