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The RT8543A is a high efficiency white LED driver. It is designed for LCD panel that employs an LED array as the lighting source. An integrated switch current mode Boost controller drives six strings in parallel and supports up to 10 pieces of LEDs per string. The internal current sinks support maximum &plusmn;2% current matching for excellent brightness uniformity in each LED string. To provide enough headroom for the operating of current sink, Boost controller monitors the minimum voltage of feedback pins and regulates an optimized output voltage for power efficiency. <p align="justify">The RT8543A has wide input voltage range from 2.5V to 24V and provides adjustable 5mA to 50mA LED current. The internal 200m&Omega;, 43V power switch with current-mode control provides cycle-by-cycle over-current protection. The RT8543A also integrates PWM and analog dimming functions for accurate LED current control. The input PWM dimming frequency can operate from 100Hz to 20kHz without inducing any inrush current in LED or inductor. </p><p align="justify">The RT8543A is available in thin WQFN-20L 4x4 package.</p>
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  • 宽输入电压范围： 2.5V~24V
  • 高输出电压：VOUT 高达 43V
  • 电流模式升压调节器
    ►600kHz~1.2MHz开关频率
    ►频率高达85%
  • 可调节电流范围：5mA~50mA ；匹配误差：2%
  • 通道电流调整精度：±3%
  • 调光控制
    ►直接 PWM 调光频率高达 20kHz，最小导通时间为500ns
    ►PWM 转“模拟+PWM”混合式调光，信号频率可高达 20kHz，最高分辨率可达8位
  • 无需外部电容，内建软起动避免冲击电流
  • 关机模式下断开 LED 连接
  • 保护
    ►LED 串开路保护
    ►电流限制保护
    ►可调节过压保护
    ►过温保护
  • 20引脚 WQFN 封装
  • 符合 RoHS 规范，不含卤素
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笔记本电脑背光源
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