(c) A practical voltage regulator involving a Zener diode reference and series pass transistor is shown in Fig. 15. The circuit is connected to an unregulated voltage source VIN- i IN VIN +1 + R 380 100 RL VOUT λουτ viz VZ N Figure 15: Single-transistor voltage regulator. (i) If a change in the load causes the output voltage Vour to decrease, explain how the circuit responds to restore the output voltage. Note: No mathematical analysis is required, and a simple chain of reasoning is sufficient. (ii) Sketch the small-signal equivalent circuit of the regulator and simplify your diagram as much as possible. (iii) The unregulated voltage source VIN is now replaced with a constant voltage VIN = 9V. If the operating point of the Zener diode is (Iz, Vz) = (5 mA, 6.7V), and the transistor has VBE =0.7V, calculate the efficiency of the regulator.

(c) A practical voltage regulator involving a Zener diode reference and series pass transistor is shown in Fig. 15. The circuit is connected to an unregulated voltage source VIN- i IN VIN +1 + R 380 100 RL VOUT λουτ viz VZ N Figure 15: Single-transistor voltage regulator. (i) If a change in the load causes the output voltage Vour to decrease, explain how the circuit responds to restore the output voltage. Note: No mathematical analysis is required, and a simple chain of reasoning is sufficient. (ii) Sketch the small-signal equivalent circuit of the regulator and simplify your diagram as much as possible. (iii) The unregulated voltage source VIN is now replaced with a constant voltage VIN = 9V. If the operating point of the Zener diode is (Iz, Vz) = (5 mA, 6.7V), and the transistor has VBE =0.7V, calculate the efficiency of the regulator.

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...

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