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Analog Circuit Design Volume Three by John Hamburger, Bob Dobkin

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Chapter 237

Isolated power supplies for Local Area Networks

Sean Gold

Abstract

Isolated power supplies for local area networks are discussed.

Keywords

Local area networks

LAN

Ethernet

Cheapernet

LT1072

switching regulator

Introduction

Local Area Networks such as Ethernet or Cheapernet, require low cost isolated power supplies with modest line and load regulation. Table 237.1 summarizes the objective design specifications based on IEEE 802.3 and ECMA 200-V. The LT1072 high efficiency switching regulator can be used in isolated flyback mode to satisfy these requirements with minimal support circuitry.1

Table 237.1

Power Supply Specifications for Figure 237.1

PARAMETER VALUE COMMENTS
VOUT −9V Ethernet 11.4 <VIN < 12.6V
Cheapernet ...

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