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The RT8561A is a 40V 8-CH LED driver capable of delivering 30mA to each channel with 10 LEDs (3.6V per diode), total of 80 LEDs with one driver. The RT8561A is a current mode boost converter operated at 1MHz, wide VIN range covers from 6V to 24V and the on-chip current switch is rated at 2.5A.The PWM output voltage loop regulates the LED pins to 0.6V with an auto-adjustment circuit allowing voltage mismatches between LED strings. The RT8561A automati-cally detects and disconnects any unconnected and/or broken strings during operation from PWM loop to prevent VOUT from over voltage. The 1.5% matched LED currents on all channels are simply programmed with a resistor or a current sink. Both analog dimming and digitally controlled PWM dimming are supported by the RT8561A. Analog dimming is linearly controlled by an external voltage. With an on-chip output clamping amplifier and a 300kΩ resistor, PWM dimming signal is easily low-pass filtered to an analog dimming signal with one external capacitor for noise-free PWM dimming. A very high contrast ratio true digital PWM dimming can be achieved by driving ACTL pin with a PWM signal.Other protecting features include programmable output over voltage protection, LED current limit, PWM switch current limit and thermal shutdown.The RT8561A is packaged with a tiny footprint package of WQFN-24L 4x4 packages.
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  • 高电压： VIN 高达24V，VOUT 高达40V，可驱动多达80只WLED（共8串，每串10只）
  • 各串电流可在 10mA 至 30mA 之间进行设定，串间匹配误差小于 1.5%
  • 1MHz 电流模式 Boost 转换器
  • 容易使用的模拟和数字调光方式
  • 可程序设计软启动
  • 自动检测未连接和/或断开的通道
  • 可程序设计过压保护
  • 关机模式下 LED 处于断开状态
  • 可用 PWM 信号在 ACTL 端实现精确的数字式调光
  • VIN 端欠压锁定保护
  • 有过热保护功能
  • 有过电流保护功能
  • 小型24引脚 WQFN 封装
  • 符合 RoHS 规范，不含卤素
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UMPC and Notebook Computer Backlight GPS, Portable DVD Backlight Desk Lights and Room Lighting
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