A power transistor is specified to have a maximum junction

Chapter 11, Problem 11.34

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A power transistor is specified to have a maximum junction temperature of 130C. When the device is operated at this junction temperature with a heat sink, the case temperature is found to be 90C. The case is attached to the heat sink with a bond having a thermal resistance CS = 0.5C/W and the thermal resistance of the heat sink SA = 0.1C/W. If the ambient temperature is 30C what is the power being dissipated in the device? What is the thermal resistance of the device, JC, from junction to case?

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