Question 22.7: Calculate the approximate output voltage in Fig. 22-14. What...
Calculate the approximate output voltage in Fig. 22-14. What is the power
dissipation in the pass transistor?
With the equations of Fig. 22-8:
V_{out} =\frac{3 \ k\Omega +1 \ k\Omega }{3 \ k\Omega } (6.2 V + 0.7 V) =9.2 V
The transistor current is approximately the same as the load current:
I_{C} =\frac{9.2 \ V}{40 \ \Omega } =230 mA
The transistor power dissipation is:
P_D = (15 V − 9.2 V)(230 mA) = 1.33 W
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