Question 15.11: Determine the regulated voltage and circuit currents for the...
Determine the regulated voltage and circuit currents for the shunt regulator of Fig. 15.22 .
The load voltage is
Eq. (15.19):
V_{L}=V_{Z}+V_{B E} (15.19)
V_{L}=8.2 V +0.7 V =8.9 V
For the given load,
I_{L}=\frac{V_{L}}{R_{L}}=\frac{8.9 V }{100 \Omega}=89 mAWith the unregulated input voltage at 22 V, the current through R_S is
I_{S}=\frac{V_{i}-V_{L}}{R_{S}}=\frac{22 V -8.9 V }{120}= 1 0 9 m Aso that the collector current is
I_{C}=I_{S}-I_{L}=109 mA -89 mA = 2 0 m A(The current through the Zener and transistor base-emitter is smaller than I_C by the transistor beta.)
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