Analog Circuit Design Volume Three

Chapter 278

Monitor network compliant −48V power supplies

Brendan Whelan

Abstract

The LTC1921, the only integrated solution that can monitor two independent ?48V power supplies, plus associated fuses and drive up to three optoisolators or LEDs to indicate status, is described.

Keywords

System monitoring

LTC1921

LT4250 Hot Swap controller

Introduction

Reliability is a top priority for the designers of modern telephone and communication equipment. Designers take extra care to protect circuitry from failure-causing temperature and voltage changes, employing redundancy whenever possible, especially for power supplies. The power supplies are monitored to obtain early warning of impending failure. Often complicated circuitry that can include ...