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Analog Circuit Design Volume Three by John Hamburger, Bob Dobkin

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Chapter 236

Isolated DC/DC conversion

Kurk Mathews

Abstract

Isolated DC/DC conversion with the LT1425 current mode controller is described.

Keywords

Current mode controller

isolated voltage

LT1425

The LT1425 is designed for applications requiring well regulated, isolated voltages, such as isolation amplifiers, remote sensors and telecommunication interfaces. A unique feedback amplifier eliminates the need to cross the isolation barrier twice, resulting in a simpler, lower parts count supply. The LT1425, available in 16-pin SO, is a 275kHz current mode controller with an integral 1.5A switch, designed primarily to provide well regulated, isolated voltages from 3V to 20V sources.

Figure 236.1 shows a typical flyback LAN supply, including ...

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