Thermal Calculations for Transistors
The material in this appendix will enable you to compare the specifications of a given transistor with the requirements of a given application, and to make a judgment regarding the use of heat sinks. You will be able to determine whether a heat sink is required and, if it is, to specify the one needed.
When current flows through a semiconductor device, heat is generated. In the case of a forward-biased transistor, most of the heat is generated in the collector-base junction. The manufacturer specifies a maximum temperature (T;) for the internal junction. Operation at higher temperatures will likely damage the transistor.
To keep the junction at an acceptable temperature, it is necessary to provide ...
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