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A power transistor is specified junction temperature of 150°C.

A power transistor is specified junction temperature of 150°C.

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
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Electrical Engineering 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, 0JC, from junction to case? Sketch the equivalent circuit and annotate the thermal resistance and temperatures.
Transcribed Image Text:Electrical Engineering 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, 0JC, from junction to case? Sketch the equivalent circuit and annotate the thermal resistance and temperatures.
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