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The RT8532A is a high efficiency white LED driver. It is designed for LCD panel that employs a 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, the Boost controller monitors the minimum voltage of feedback pins and regulates an optimized output voltage for power efficiency. <p align="justify">The RT8532A 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 RT8532A also integrates PWM and analog dimming functions for accurate LED current control. The input PWM dimming frequency can be operated operate from 100Hz to 20kHz without any inrush current in LED. </p><p align="justify">The RT8532A is available in WQFN-20L 3x3 package.</p>
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  • 输入电压范围：2.5V~24V
  • 输出电压最大值：43V
  • 各通道电流调节范围：5mA~50mA，误差不超过2%
  • 通道电流调节精度：±3%
  • 调光控制
    ►直接PWM调光：信号频率可达20kHz，最短导通时间500ns
    ►PWM转模拟/PWM调光：信号频率可达20kHz，最高9位分辨率
  • 内建软启动
  • 关机模式LED连接断开
  • 保护特性
    ►LED串开路保护
    ►电流限制保护
    ►过热保护
  • 20引脚WQFN封装
  • 符合RoHS规范，不含卤素
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UMPC和笔记本电脑背光源
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