A power transistor is specified to have a maximum junction temperature of 150°C. When the device is operated at this junction temperature with a heat sink, the case temperature is found to be 97°C. The case is attached to the heat sink with a bond having a thermal resistance 8CS=0.5°C/W and the thermal resistance of the heat sink OSA =0.1°C/W. If the ambient temperature is 25°C, what is the power being dissipated in the device? What is the thermal resistance of the device, 8JC, from junction to case? Sketch the equivalent circuit and annotate the thermal resistance and temperatures.

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Conduction and Convection

When energy travels from one object to another it is said to have undergone heat transfer. Heat transfer is nothing but the transfer of thermal energy or internal energy from one thing to another, like e.g., when a vessel with water, kept on top of a burner, heats up because of the flame underneath it.