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RTQ4544-QB 是一款 4 通道 LED 驱动器,搭配一个 DC-DC 控制器,每个通道可提供 170mA。其电流模式(current-mode)的开关式 DC-DC 控制器支援升压(boost)或 SEPIC 拓扑,操作频率范围为 300kHz 至 2.2MHz。此装置可接受宽范围 3V 至 40V 的输入电压,并可承受车用冷车启动(cold crank)与负载突降(load dump)事件。内建电流汲取器(current sink)提供最高 3.5% 的电流精度与通道间失配控制,以确保每串 LED 具有优异的亮度一致性。RTQ4544-QB 会在运作期间自动侦测并将未连接与/或断线的 LED 串从控制回路中断开,以避免 VLED 过电压。为提供电流汲取器运作所需的足够裕量(headroom),升压控制器会监测 LEDx 脚位的最低电压,并调节最佳化的输出电压以提升电源效率。RTQ4544-QB 具备标准 I<sup>2</sup>C 数位介面,用于功能设定。此外,升压开关频率与 PWMO 频率可透过外部电阻或 I<sup>2</sup>C 介面进行程式化设定。完整的诊断资讯亦可透过 I<sup>2</sup>C 介面取得;当出现异常状况时,装置会送出状态讯号给系统。RTQ4544-QB 提供 24 脚 WQFN 封装,工作温度范围为 -40°C 至 125°C。
RTQ4544-QB 电路图
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<div class="spec-list"><ul class="lv1"><li>Wide Operating Input Voltage: 5V to 40V - Support Cold Crank Down to 3V Supply After Start-Up </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 - Switching Frequency: 300kHz to 2.2MHz - Spread Spectrum for Reduced EMI - Automatic Output Voltage Discharged When Controller Is Disabled </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 I2C or PWM Input </li><li>Programmable Multi-Dimming Operation Mode - Up to 16-Bit PWM and Mixed Dimming Resolution - Up to 12-Bit DC Dimming Resolution </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 - LED Open and Short Fault - Boost OCP, OVP, and UVP Protection - VIN OVP, OCP, and UVLO Fault - Warning and Over-Temperature Protection - FSET Pin Short Detection Protection - Extensive Fault Diagnostics and Fault Indicator Signal Output </li><li>Embedded Memory with MTP </li><li>AEC-Q100 Grade 1 Qualified </li><li>Functional Safety Design (ASIL-B) </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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RTQ4544-QB 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>Head-Up Displays </li></ul></div>
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