A silicon power transistor is operated with a heat sink ( SA = 1.5 C/W). The transistor, rated at 150 W (25 C), has JC = 0.5 C/W, and the mounting insulation has CS = 0.6 C/W. What is the maximum power that can be dissipated if the ambient temperature is 50 C and TJmax = 200 C?

A silicon power transistor is operated with a heat sink ( SA = 1.5 C/W

1.	A silicon power transistor is operated with a heat sink ( _SA = 1.5 C/W). The transistor, rated at 150 W (25 C), has _JC = 0.5 C/W, and the mounting insulation has _CS = 0.6 C/W. What is the maximum power that can be dissipated if the ambient temperature is 50 C and T_Jmax = 200 C?
A.	61.5 W
B.	60.0 W
C.	57.7 W
D.	55.5 W
Answer» D. 55.5 W