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RT8306 是一款 48 通道高精度定電流 LED 驅動器，具備 12-bit PWM 控制，適用於 LED 背光的時序掃描應用。RT8306 具有 48 通道彈性 PWM 產生器，以及獨立 12-bit PWM 亮度控制，可控制每個通道的 LED 電流。此外，它具備一個全域高精度 8-bit IDAC，可設定 LED 峰值電流。另有 48 個獨立 8-bit DAC，可用於提升或降低 LED 電流，以支援高動態範圍應用。<br /><br />LED 驅動器上的定電流汲入通道可汲入 60mA 電流，其電流水準可透過暫存器位址 0561 [7:0] 設定，範圍為 5mA 至 60mA。RT8306 為每個通道提供 ±2% 的高精度電流。它亦支援透過獨立 PWM 產生器進行區域調光與全域調光，並具備可程式化 PWM 占空比、週期與延遲。此外，RT8306 提供動態餘裕控制 (DHC) 功能，可產生回授訊號至 DC-DC 控制迴路並調節輸出電壓。<br /><br />RT8306 亦提供 LED 開路 / 短路保護。若任何通道發生開路或短路，FLT 腳位將被拉低，且輸出通道將個別關閉。RT8306 採用 WQFN-72L 8x8 封裝，可實現針對 PCB 空間最佳化的解決方案。
RT8306 電路圖
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<div class="spec-list"><ul class="lv1"><li>Wide Current Range : 5mA to 60mA </li><li>Programmable Channel Current (8-bit Resolutions) </li><li>Low Dropout Voltage : 400mV at 60mA </li><li>Support Dot Correlation Function </li><li>Support HDR Mode </li><li>Dimming Mode : <ul class="lv2"> <li></li><li>PWM Mode for Scan and Non-Scan Type </li><li>Direct PWM Mode </li><li>DC Mode </li></ul> </li><li>±2% Accuracy Current for Wide Current Range </li><li>LED Current Rising and Falling Slop Control </li><li>Fault Detection for LED Open/Short </li><li>Under-Voltage Lockout and Thermal Shutdown </li><li>Integrated Dynamic Headroom Control (DHC) </li><li>Support 1D/2D/3D Dimming (Programmable Channel Delay, Individual PWM Duty Control, Automatic VSYNC Synchronization) </li><li>25MHz Max SPI Interface with Daisy chain </li><li>Flexible Daisy-Chained SPI Interface </li><li>RoHS Compliant and Halogen Free </li></ul></div>
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RT8306 訂購資訊
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<div class="spec-list"><ul class="lv1"><li>LCD TV, MNT Display Backlight </li><li>General Purpose Constant Current Source </li><li>Architectural and Decorative LED Lighting </li></ul></div>
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