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Analog Circuit Design Volume Three by John Hamburger, Bob Dobkin

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Chapter 135

Off-line low noise power supply does not require filtering to meet FCC emission requirements

Jim Williams

Abstract

An off-line low noise power supply that does not require filtering to meet FCC emission requirements is described.

Keywords

Switching regulator

Low noise

LT1533

Introduction

Off-line power supplies require input filtering components to meet FCC emission requirements. Additionally, board layout is usually quite critical, requiring considerable experimentation even for experienced off-line supply designers. These considerations derive from the wideband harmonic energy generated by the fast switching of traditional off-line supplies. A new device, the LT1533 low noise switching regulator, eliminates these issues ...

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