Current mirror improves PWM regulator's performance

Focus:

Isolated feedback circuit based on a single op amp reduces component count in pulse-width modulated power supply designs. A second improvement in the feedback circuit involves the clamping the optoisolator's output voltage excursion to improve the optocoupler's switching speed and thereby improve the transient response of the PWM control loop.

What you’ll learn:

• How to reduce parts count in an isolated feedback circuit
• How to improve power supply transient performance by reducing the Miller effect in an optocoupler
• An EDN Design Idea

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Author & Publication:

Grant Smith, National Semiconductor, Phoenix, AZ; Edited by Brad Thompson and Fran Granville, EDN, Mar 01 2007

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