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The RT8511B is an LED driver IC that can support up to 10 WLED in series. It is composed of a current mode boost converter integrated with a 43V/2.2A power switch running at a fixed 500kHz frequency and covering a wide VIN range from 2.7V to 24V. <p align="justify">The white LED current is set with an external resistor, and the feedback voltage is regulated to 200mV (typ.). During operation, the LED current can be controlled by the PWM input signal in which the duty cycle determines the feedback reference voltage. </p><p align="justify">For brightness dimming, the RT8511B is able to maintain steady control of the LED current. Therefore, no audible noises are generated on the output capacitor. The RT8511B also has programmable over voltage pin to prevent the output from exceeding absolute maximum ratings during open LED conditions. The RT8511B is available in WDFN-8L 2x2 package.</p>
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  • 宽输入电压范围：2.7V~24V
  • 输出电压可高达 43V
  • PWM 调光控制信号的频率范围为 100Hz~8kHz
  • 软启动和补偿电路全部内建
  • 200mV 参考电压
  • 有内部滤波器对 PWM 调光信号进行处理
  • 可程序设计过压保护
  • 有过温保护
  • 有电流限制保护
  • 8引脚 WDFN 封装
  • 符合 RoHS 规范，不含卤素
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UMPC 和笔记本电脑背光 GPS、便携式 DVD 背光
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