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RTQ4554-QT 是一款 4 通道 LED 驱动器，具备 DC-DC 控制器，每个通道可提供 170mA 电流。电流模式切换式 DC-DC 控制器支援升压或 SEPIC 拓扑，并在 300kHz 至 2.2MHz 频率范围内运作。此元件接受 3V 至 40V 的宽输入电压范围，并可承受直接车用冷车启动与负载突降事件。内部电流汲入器支援最大 3.5% 电流精度与不匹配，可在每串 LED 中实现优异的亮度均匀性。RTQ4554-QT 会在运作期间自动侦测任何未连接及 / 或断裂的灯串，并将其自控制回路中断开，以防止 VLED 过压。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 LEDx 脚位的最低电压，并调节最佳化输出电压以提升电源效率。RTQ4554-QT 具备标准 I<sup>2</sup>C 数位介面，用于功能设定。此外，升压切换频率与 PWMO 频率可透过 I<sup>2</sup>C 介面进行程式化设定。完整诊断资讯亦可透过 I<sup>2</sup>C 介面取得。当异常情况发生时，状态讯号将被传送至系统。RTQ4554-QT 采用 24-pin WQFN 封装，并可在 -40°C 至 125°C 的温度范围内运作。
RTQ4554-QT 电路图
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<div class="spec-list"><ul class="lv1"><li>Wide Operating Input Voltage: 5V to 40V <ul class="lv2"> <li></li><li>Support Cold Crank Down to 3V Supply After Start-Up </li></ul> </li><li>High Output Voltage: Up to 45V </li><li>NMOS or PMOS Input Protection Switch </li><li>Integrated Boost and SEPIC Controller for LED Driver <ul class="lv2"> <li></li><li>Switching Frequency: 300kHz to 2.2MHz </li><li>Spread Spectrum for Reduced EMI </li><li>Automatic Output Voltage Discharged When Controller Is Disabled </li></ul> </li><li>4-Channel Current Sinks with 30mA to 170mA per Channel </li><li>Channel Current Regulation with Accuracy ±3.5% and Matching 3.5% </li><li>Up to 16-Bit Dimming Resolution with I<sup>2</sup>C or PWM Input </li><li>Programmable Multi-Dimming Operation Mode <ul class="lv2"> <li></li><li>Up to 16-Bit PWM and Mixed Dimming Resolution </li><li>Up to 12-Bit DC Dimming Resolution </li></ul> </li><li>Dimming Ratio 32000:1 in PWM Mode Using a 152Hz Output PWM Frequency </li><li>Dimming Ratio 4000:1 in DC Mode </li><li>Advanced Slope Function for Smooth Dimming </li><li>Phase-Shift PWM Mode Reduces Audible Noise </li><li>Adaptive Headroom Control Method to Optimize Output Voltage for Power Efficiency </li><li>Protections <ul class="lv2"> <li></li><li>LED Open and Short Fault </li><li>Boost OCP, OVP, and UVP Protection </li><li>VIN OVP, OCP, and UVLO Fault </li><li>Warming and Over-Temperature Protection </li><li>Extensive Fault Diagnostics and Fault Indicator Signal Output </li></ul> </li><li>Embedded Memory with MTP </li><li>AEC-Q100 Grade 1 Qualified </li><li>Ambient Temperature Range: -40°C to 125°C </li><li>Junction Temperature Range: -40°C to 150°C </li></ul></div>
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RTQ4554-QT 订购信息
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<div class="spec-list"><ul class="lv1"><li>Automotive Infotainment Displays </li><li>Automotive Instrument Clusters </li><li>Heads-Up Displays </li></ul></div>
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