Question 15.8: Calculate the output voltage and the Zener current in the re...
Calculate the output voltage and the Zener current in the regulator circuit of Fig. 15.14 forR_{L}=1 k \Omega.
V_{o}=V_{Z}-V_{B E}=12 V -0.7 V =11.3 V
V_{C E}=V_{i}-V_{o}=20 V -11.3 V =8.7 V
I_{R}=\frac{20 V -12 V }{220 \Omega}=\frac{8 V }{220 \Omega}=36.4 mA
For R_{L}=1 k \Omega,
=I_{L}=\frac{V_{o}}{R_{L}}=\frac{11.3 V }{1 k \Omega}=11.3 mA
I_{B}=\frac{I_{C}}{\beta}=\frac{11.3 mA }{50}=226 \mu A
I_{Z}=I_{R}-I_{B}=36.4 mA -226 \mu A \approx 36 mA
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