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Analog Circuit Design Volume Three by John Hamburger, Bob Dobkin

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Chapter 303

High power desktop LCD backlight controller supports wide dimming ratios while maximizing lamp lifetime

Rich Philpott

Abstract

A high power desktop LCD backlight controller that supports wide dimming ratios while maximizing lamp lifetime is described.

Keywords

Cold cathode fluorescent lamps

CCFL controller

Multimode Dimming

LT1768

Introduction

Liquid crystal displays (LCDs), long standard in laptop computers and handheld instruments, are gaining in popularity as desktop computer displays. Larger displays require multiple high power cold cathode fluorescent lamps (CCFLs). The lamps must have a dimming range and life expectancy comparable to those of previous generations of desktop displays. To achieve maximum lamp lifetime ...

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