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RT8555 是一款用于白光 LED 的高效率驱动器。它适用于单节 / 两节电池输入，以驱动包含六串并联且每串最多 10 颗 WLED 的 LED 灯条。内部电流灌入器支持最大 ±2% 电流不匹配，可在每串 LED 中实现优异的亮度均匀性。为提供电流灌入器运行所需的足够余量，升压控制器会监测反馈引脚的最低电压，并调节优化输出电压以提升电源效率。RT8555 具备 2.7V 至 24V 的宽输入电压工作范围，并包含 I<sup>2</sup>C 接口，用于控制调光模式、工作频率与 LED 电流。内部 100mΩ、36V 功率开关搭配电流模式控制，可提供过电流保护。RT8555 的开关频率可在 300kHz 至 2MHz 之间调节，可在效率与元件尺寸之间提供灵活性。RT8555 采用 WL-CSP-20B 1.65 x 2.05 (BSC)，间距 0.4mm 封装。
/content/dam/richtek-eds/resources/product-specifications/rt85/rt8555/images/circuit/59260rxkir.GIF
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<li class="mv5">宽输入电压范围 : 2.7V ~ 24V</li><li class="mv5">高输出电压 : 高达36V</li><li class="mv5">可程序设计通道电流 : 10mA ~ 35mA</li><li class="mv5">±3%精准度与±2%匹配误差的通道电流调节</li><li class="mv5">调光控制<br>►直接PWM调光可达20kHz，最小导通时间400ns<br>►PWM转模拟调光可达20kHz和8位分辨率</li><li class="mv5">I<SUP>2</SUP>C可编程LED电流，开关频率，调光模式</li><li class="mv5">OTP内嵌式内存</li><li class="mv5">切换频率 : 300kHz ~ 2MHz</li><li class="mv5">保护<br>►LED串开路侦测<br>►电流限制<br>►可程序设计的过压保护<br>►过热保护</li><li class="mv5">20脚WL-CSP，0.4mm间距封装</li><li class="mv5">符合RoHS规范，不含卤素</li>
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