Question

A transistor will operate at a case temperature of 100ºC. When the transistor is ON, the voltage across it is 1V, and the load current is 5A. When the transistor is OFF, the voltage across it is 75V, and the leakage current is 100mA. The transistor is operated at 60% duty ratio (d=0.6). There is no switching loss. A heat sink needs to be attached to the transistor to operate it at 46ºC ambient temperature. Assume the thermal coefficient θcs is zero. Determine the required thermal co-efficient θsa of the heat sink (ºC/W).

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