Question 12.18: A silicon power transistor is operated with a heat sink (θSA...
A silicon power transistor is operated with a heat sink\left(\theta_{S A}=1.5^{\circ} C / W \right). The transistor, rated at 150 W (25°C), has \theta_{J C}=0.5^{\circ} C / W, and the mounting insulation has\theta_{C S}=0.6^{\circ} C / W. What maximum power can be dissipated if the ambient temperature is 40°C andT_{J_{\max }}=200^{\circ} C?
P_{D}=\frac{T_{J}-T_{A}}{\theta_{J C}+\theta_{C S}+\theta_{S A}}=\frac{200^{\circ} C -40^{\circ} C }{0.5^{\circ} C / W +0.6^{\circ} C / W +1.5^{\circ} C / W } \approx 61.5 W
Related Answered Questions
Question: 12.14
Verified Answer:
Using the computed values of D_{2}=0.10, D_...
Question: 12.17
Verified Answer:
P_{D}\left(125^{\circ} C \right)=P_{D}\left...
Question: 12.16
Verified Answer:
The total harmonic distortion is
THD =\sqrt...
Question: 12.15
Verified Answer:
Using Eq. (12.34),
D_{2}=\left|\frac{\frac{...
Question: 12.13
Verified Answer:
Using Eq. (12.30)
\% n \text {th harmonic d...
Question: 12.12
Verified Answer:
The maximum power dissipated by both output transi...
Question: 12.11
Verified Answer:
The maximum input power is
\operatorname{ma...
Question: 12.10
Verified Answer:
The peak input voltage is
V_{i}( p )=\sqrt{...
Question: 12.9
Verified Answer:
Using Eq. (12.29) gives
a. \% \eta=78.54 \f...
Question: 12.8
Verified Answer:
The maximum output power is
maximum P_{o}( ...