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Product Spec Banner
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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。内部电流汲入器支援最大 ±2% 电流不匹配，可在每串 LED 中实现优异的亮度均匀性。为提供电流汲入器运作所需的足够余裕，升压控制器会监测回授脚位的最低电压，并调节最佳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 介面，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 的切换频率可在 300kHz 至 2MHz 之间调整，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。
RT8555 电路图
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<div class="spec-list"><ul class="lv1"><li>Wide Operating Input Voltage : 2.7V to 24V </li><li>High Output Voltage : Up to 36V </li><li>Programmable Channel Current : 10mA to 35mA </li><li>Channel Current Regulation with Accuracy ±3% and Matching ±2% </li><li>Dimming Controls <ul class="lv2"> <li></li><li>Direct PWM Dimming up to 20kHz and Minimum On-Time to 400ns </li><li>PWM to Analog Dimming up to 20kHz with 8-bit Resolution </li></ul> </li><li>I<sup>2</sup>C Programs LED Current, Switching Frequency, Dimming Mode </li><li>Embedded Memory by OTP </li><li>Switching Frequency : 300kHz to 2MHz </li><li>Protections <ul class="lv2"> <li></li><li>LED Strings Open Detection </li><li>Current Limit </li><li>Programmable Over Voltage Protection </li><li>Over-Temperature Protection </li></ul> </li><li>20-Ball WL-CSP, with pitch 0.4mm Package </li><li>RoHS Compliant and Halogen Free </li></ul></div>
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RT8555 订购信息
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RT8555
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<div class="spec-list"><ul class="lv1"><li>Tablet and Notebook Backlight </li></ul></div>
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