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Analog Circuit Design Volume Three by John Hamburger, Bob Dobkin

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Chapter 235

Isolated flyback converter regulates without an optocoupler

Robert Sheehan

Abstract

A flyback circuit that represents a simple, low cost solution for isolated power is described.

Keywords

Isolated flyback controller

LT1725

Introduction

Designing an isolated power supply can be a daunting task. Optocouplers, secondary-side error amplifiers and frequency compensation can send you scurrying to your distributor catalog to find a module. Fortunately, there are new IC solutions that make isolated power much simpler and less expensive. Here is a gem of a circuit that takes the headaches out of your isolated power supply design task and at a small fraction of a module’s cost.

The design criteria

• Input Voltage: 100V DC ...

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