A power transistor operating at an ambient temperature of
Chapter 11, Problem 11.32(choose chapter or problem)
A power transistor operating at an ambient temperature of 50C, and an average emitter current of 3A, dissipates 30 W. If the thermal resistance of the transistor is known to be less than 3C/W, what is the greatest junction temperature you would expect? If the transistor VBE measured using a pulsed emitter current of 3 A at a junction temperature of 25C is 0.80V, what average VBE would you expect under normal operating conditions? (Use a temperature coefficient of 2 mV/C.)
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