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RT4832 是一款整合式總電源解決方案,整合閃光燈 LED 驅動器(Flash LED Driver)、背光 WLED 驅動器(Backlight WLED Driver)及 DSV 驅動器。閃光燈 LED 驅動器支援最多 2 通道、每通道最高 1.5A 的應用。背光 WLED 驅動器可提供最高 36V 輸出,支援最多 10 顆 WLED 串接應用,並提供 1024 級 LED 電流調整,支援對數曲線(Logarithmic)及線性曲線(Linear)調光模式。 DSV 採用單電感升壓轉換器搭配反相電荷幫浦架構,相較於雙電感方案可大幅減少電路板面積。負電壓輸出(CPOUT)由升壓輸出(LCMOUT)產生;同時提供 DSV 正電壓輸出(POS),其電源雜訊透過 LDO 進一步降低。正負輸出電壓皆可分別於 ±4V 至 ±6V 範圍內以 50mV 為步進進行程式設定。 Flash 升壓轉換器可工作於 2MHz 或 4MHz 開關頻率,其中 4MHz 模式可使用更小型、低高度的外部元件。Torch 模式電流可設定於 25mA 至 375mA 範圍內,每級調整 25mA;Strobe 模式電流則可設定於 100mA 至 1.5A 範圍內,每級調整 100mA。 DSV 可驅動最高 10 吋 TFT-LCD 面板,涵蓋由小尺寸(SFF)至中尺寸(MFF,例如平板電腦)的顯示器應用。正負輸出電壓軌通常連接至 Source Driver IC。輸入電壓範圍為 2.5V 至 5.5V,適合單節鋰離子電池、鎳鋰電池及鋰聚合物電池應用,對稱輸出電流最高可達 80mA。 RT4832 內建完整保護功能,包括輸入欠壓鎖定保護(UVLO)、輸入電壓監控保護、過電流保護(OCP)、過電壓保護(OVP)、LED 短路保護、輸出短路保護以及過溫保護(OTP)。 RT4832 採用 WL-CSP-30B(2.24mm × 2.64mm,BSC)封裝。
RT4832 電路圖
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<div class="spec-list"><ul class="lv1"><li>Input Voltage Range : 2.5V to 5.5V </li><li>Internal Soft-start, UVLO, OTP, OCP </li><li>Typical Shutdown Current : < 1μA </li><li>-40 to 85°C Temperature Range </li><li>2CH Back Light LED Driver <ul class="lv2"> <li></li><li>Drives Up to 10 WLEDs in Two Strings </li><li>External PWM Pin Control and I<sup>2</sup>C Programmable 11 bit Linear and Exponential Brightness </li><li>LED Current Accuracy ±5% (> 500μA), ±3% (> 5mA) </li><li>I<sup>2</sup>C Programmable OVP 18/22/25/29/33/36V </li></ul> </li><li>2CH Flash LED Driver <ul class="lv2"> <li></li><li>Torch Mode Current from 25mA to 375mA per 25mA Step with 2 Channels </li><li>Strobe Mode Current from 100mA to 1.5A per 100mA Step with 2 Channels </li><li>I<sup>2</sup>C Programmable Flash Safety Timer from 32ms to 1024ms per 32ms Step </li><li>High Accurate Safety Timer ±10%, Current Accuracy ±4% (>375mA), Current Matching ±7% (>375mA) </li><li>VIN Monitor Protection from 2.5V to 3.2V per 0.1V Step </li><li>Selectable Input Current Limit 1.9/2.8A </li><li>2MHz/4MHz Switching Frequency for Flash LED </li><li>Flash LED1/2 Short Protection, and Output Short Protection </li><li>Txmask Protection by Independent Pin </li></ul> </li><li>DSV <ul class="lv2"> <li></li><li>I<sup>2</sup>C Programmable Output Voltages </li><li>Flexible Boost Voltage, POS, CPOUT Default Setting </li><li>Regulated Voltage Output : 4V to 6V per 50mV Step </li><li>Positive Voltage Output : 4 to 6V per 50mv Step </li><li>Negative Voltage Output : -4 to -6V per 50mV Step </li><li>User Selectable Output Fast Discharge Mode or Float Mode when Turned Off </li><li>Independent Positive and Negative Enable Control by Two External Pins </li><li>True Load Disconnect, OCP, and Positive/Negative SCP Function </li></ul> </li></ul></div>
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RT4832 訂購資訊
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<div class="spec-list"><ul class="lv1"><li>Smart Phones </li><li>Probable Instruments </li></ul></div>
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