Question 12.12: For the circuit of Fig. 12.19 , determine the maximum power ...
For the circuit of Fig. 12.19 , determine the maximum power dissipated
by the output transistors and the input voltage at which this occurs.
The maximum power dissipated by both output transistors is
\operatorname{maximum} P_{2 Q}=\frac{2 V_{C C}^{2}}{\pi^{2} R_{L}}=\frac{2(25 \mathrm{~V})^{2}}{\pi^{2} 4 \Omega}=31.66 \mathrm{~W}This maximum dissipation occurs at
V_{L}=0.636 V_{L}( p )=0.636(25 V )= 1 5 . 9 V(Notice that at V_{L}=15.9 V the circuit required the output transistors to dissipate 31.66 W, whereas at V_{L}=25 V they only had to dissipate 21.3 W.)
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