Q1. The output DC voltage Vo of a step-down (buck) converter as shown in Fig. 1 is maintained at 5 V by controlling the duty cycle D. The input dc voltage V, to the converter is 25 V. The switching frequency fs of the converter is 300 kHz. The minimum load current, lo of the converter is 0.25 A. Assuming ideal devices and components, find (i) the minimum inductance, (ii) the maximum and minimum inductor currents, (iii) Obtain the filter capacitance C required to keep the output voltage ripple factor V/Vo < 0.70 %, and (iv) sketch PWM switch S, inductor current I, voltage across the inductor VL, and output voltage Vo.

Q1. The output DC voltage Vo of a step-down (buck) converter as shown in Fig. 1 is maintained at 5 V by controlling the duty cycle D. The input dc voltage V, to the converter is 25 V. The switching frequency fs of the converter is 300 kHz. The minimum load current, lo of the converter is 0.25 A. Assuming ideal devices and components, find (i) the minimum inductance, (ii) the maximum and minimum inductor currents, (iii) Obtain the filter capacitance C required to keep the output voltage ripple factor V/Vo < 0.70 %, and (iv) sketch PWM switch S, inductor current I, voltage across the inductor VL, and output voltage Vo.

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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