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The RT8577A is an 4-CH LED driver capable of delivering 120mA for each channel. The RT8577A is a current mode boost converter with an adjustable switching frequency via the RT pin from 200kHz to 2.1MHz and a wide VIN range from 5.5V to 40V. <p align="justify">The PWM output voltage loop selects and regulates the LED pin with the highest voltage string to 0.6V, hence allowing voltage mismatches between LED strings. The RT8577A automatically detects and disconnects any unconnected and/or broken strings during operation from PWM loop to prevent V<sub>OUT</sub> from over voltage. The 1.5% matched LED currents on all channels are simply programmed with a resistor. A very high contrast ratio true digital PWM dimming can be achieved by driving the PWM pin with a PWM signal. </p><p align="justify">When an abnormal situation (OVP/short/OTP) occurs, a status signal will be sent to the system to shut down the IC.</p>
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  • 宽输入电压范围： 5.5V~40V
  • Boost 转换器的工作频率可在 200kHz~2.1MHz 之间进行调节
  • 可程序设计输出电流
  • 通道间电流一致性误差：±1.5%
  • 外部调光控制
  • Boost MOSFET 开关过流保护
  • 自动 LED 开路、短路保护以防范输出过压
  • VCC 欠压锁定保护
  • 可调过压保护
  • 欠压保护
  • 热关机保护
  • 开路、短路、过热等异常状态指示
  • AEC-Q100 Grade 3认证
  • 符合 RoHS 规范，不含卤素
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汽车信息娱乐 LCD TV, 显示器背光 LED驱动器应用 通用恒定电流源
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