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RTQ4552-QT 是一款 6 通道 LED 驅動器,具備 DC-DC 控制器,每個通道可提供 170mA 電流。電流模式切換式 DC-DC 控制器支援升壓或 SEPIC 拓撲,並在 300kHz 至 2.2MHz 頻率範圍內運作。此元件接受 3V 至 40V 的寬輸入電壓範圍,並可承受直接車用冷車啟動與負載突降事件。內部電流汲入器支援最大 3.5% 電流精度與不匹配,可在每串 LED 中實現優異的亮度均勻性。RTQ4552-QT 會在運作期間自動偵測任何未連接及 / 或斷裂的燈串,並將其自控制迴路中斷開,以防止 VLED 過壓。為提供電流汲入器運作所需的足夠餘裕,升壓控制器會監測 LEDx 腳位的最低電壓,並調節最佳化輸出電壓以提升電源效率。RTQ4552-QT 具備標準 I<sup>2</sup>C 數位介面,用於功能設定。此外,升壓切換頻率與 PWMO 頻率可透過外部電阻或 I<sup>2</sup>C 介面進行程式化設定。完整診斷資訊亦可透過 I<sup>2</sup>C 介面取得。當異常情況發生時,狀態訊號將被傳送至系統。RTQ4552-QT 採用 24-pin WQFN 封裝,並可在 −40°C 至 125°C 的溫度範圍內運作。
RTQ4552-QT 電路圖
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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>6-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 - 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 Sloper 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 - Warming and Over-Temperature Protection - Extensive Fault Diagnostics and Fault Indicator Signal Output </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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RTQ4552-QT 訂購資訊
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<div class="spec-list"><ul class="lv1"><li>Automotive Infotainment Display </li><li>Automotive Instrument Clusters </li><li>Heads-Up Display </li></ul></div>
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