A power transistor for which TJmax = 180C can dissipate 50
Chapter 11, Problem 11.35(choose chapter or problem)
A power transistor for which TJmax = 180C can dissipate 50 W at a case temperature of 50C. If it is connected to a heat sink using an insulating washer for which the thermal resistance is 0.6C/W, what heat-sink temperature is necessary to ensure safe operation at 30 W? For an ambient temperature of 39C, what heat-sink thermal resistance is required? If, for a particular extruded-aluminum-finned heat sink, the thermal resistance in still air is 4.5C/W per centimeter of length, how long a heat sink is needed?
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