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Analog Circuit Design Volume Three by John Hamburger, Bob Dobkin

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Chapter 24

Ultralow noise switching power supplies simplify EMI compliance

David Canny

Abstract

Ultralow noise switchers simplify product EMI compliance and help avoid last minute shipping delays. LT3439, one of several low noise switchers available from Linear Technology, is described.

Keywords

Electromagnetic interference

EMI compliance

LT3439

Ultralow noise switching

Introduction

Most electronic products must pass electromagnetic interference (EMI) compliance tests—such as the FCC Part 15 rules in the US—before they can be released into the market. When a company’s product fails EMI compliance tests, the company loses control of the development process, shipping dates begin to slip, projected revenues diminish and expenses start ...

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