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CCFL背光灯及LCD对比度控制负压控制器

以数字方式或电位器控制LCD对比度或CCFL亮度

产品详情

主要特征

应用/用途

简化框图

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主要特征

  • Drives Backplane and Backlight
  • 4V to 30V Battery Voltage Range
  • Low 500µA Supply Current
  • Digital or Potentiometer Control of CCFL Brightness and LCD Bias Voltage
  • Negative LCD Contrast (MAX753)
  • Positive LCD Contrast (MAX754)
  • Independent Shutdown of Backlight and Backplane Sections
  • 25µA Shutdown Supply Current

应用/用途

  • 笔记本电脑
  • 掌上电脑
  • PDA及其它手持设备
  • 笔输入数据系统
  • 便携式数据收集终端

描述

The MAX753/MAX754 drive cold-cathode fluorescent lamps (CCFLs) and provide the LCD backplane bias (contrast) power for color or monochrome LCD panels. These ICs are designed specifically for backlit notebook-computer applications.

Both the backplane bias and the CCFL supply can be shut down independently. When both sections are shut down, supply current drops to 25µA. The LCD contrast and CCFL brightness can be adjusted by clocking separate digital inputs or using external potentiometers. LCD contrast and backlight brightness settings are preserved in their respective counters while in shutdown. On power-up, the LCD contrast counter and CCFL brightness counter are set to one-half scale.

The ICs are powered from a regulated 5V supply. The magnetics are connected directly to the battery, for maximum power efficiency.

The CCFL driver uses a Royer-type resonant architecture. It can provide from 100mW to 6W of power to one or two tubes. The MAX753 provides a negative LCD bias voltage; the MAX754 provides a positive LCD bias voltage.

简化框图

MAX753、MAX754:原理框图 MAX753、MAX754:原理框图 Zoom icon

支持和培训

在Maxim的知识库中搜索技术问题的答案

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Maxim的专业工程师团队也会为您解答相应的技术问题,请访问Maxim的 支持中心