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Product Spec Banner
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RT4540A 是一款白光 LED 驱动器，适用于单节或双节电池输入，可驱动包含六组并联 LED 串列的灯条。内建电流汲取器可提供最高 ±2% 的电流失配精度，确保各 LED 串列具有优异的亮度一致性。为了提供足够的电流汲取器操作裕量，升压控制器会监测回授脚位中的最低电压，并调节最佳化输出电压以提升电源效率。RT4540A 内建 I²C 介面，可控制调光模式、操作频率及 LED 电流。其内建 250mΩ、36V 功率开关搭配电流模式控制，可提供过电流保护功能。RT4540A 的切换频率可于 100kHz 至 1.6MHz 间调整，在效率与元件尺寸之间提供设计弹性。RT4540A 采用 WQFN3x3-24（0.4mm Pitch）封装。建议接面温度范围为 -40°C 至 150°C，环境温度范围为 -40°C 至 125°C。
RT4540A 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>Channel Current Programmable: 6mA to 25mA </li><li>Channel Current Regulation with Accuracy ±3% and Matching ±2% </li><li>Dimming Controls - Direct PWM up to 25kHz with Minimum 1% Duty - PWM to Analog up to 2kHz with 12-Bit Resolution, up to 4kHz with 11-Bit Resolution, up to 8kHz with 10-Bit Resolution - PWM to Mixed up to 2kHz with 12-Bit Resolution, up to 4kHz with 11-Bit Resolution, up to 8kHz with 10-Bit Resolution - PWM to Mixed-26kHz up to 2kHz with 12-Bit Resolution, 4kHz with 11-Bit Resolution, up to 8kHz with10-Bit Resolution </li><li>I<sup>2</sup>C Programs LED Current, Switching Frequency, Dimming Mode </li><li>Switching Frequency: 100kHz to 1.6MHz </li><li>Embedded Memory with MTP </li><li>Protections - LED Strings Open Protection - Overcurrent Protection - Programmable Overvoltage Protection - Over-Temperature Protection - Strings Short Detection </li></ul></div>
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RT4540A 订购信息
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RT4540A
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RT4540A
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<div class="spec-list"><ul class="lv1"><li>Tablet and Notebook LED Backlights </li></ul></div>
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