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RT4831A是供可擕式設備使用的液晶屏偏置電源兼4通道WLED背光源驅動器,其WLED背光源驅動器可以最高29V電壓驅動4個並聯的WLED串,各串電流可用I2C介面和/或外部PWM輸入進行控制以獲得60μA~30mA的輸出,其解析度高達11位,可表現為指數或線性特性。供給液晶屏的偏置電源由一個Boost轉換器、一個線性穩壓器和一個實現極性反轉的電荷泵提供正、負壓輸出,其負載能力可達150mA,輸出電壓可經I2C介面在±4V~±6.5V之間以50mV的級差進行設定。RT4831A的封裝形式為WL-CSP-24B 1.84x2.68(BSC)。
系統►硬體使能引腳►I2C控制介面►過熱保護
WLED背光源驅動器►輸入電壓範圍:2.7V~5V►驅動多達4串並聯連接的WLED串►輸出電壓最高29V►使用外部PWM輸入和I2C介面進行亮度控制►11位元解析度的指數或線性亮度控制►可程式控制的過壓保護►可程式控制的過流保護►自動工作頻率:250kHz, 500kHz, 1MHz►WLED電流增、減過程平滑順暢
液晶屏偏置電源►輸入電壓範圍:2.7V~5V►可程式控制正/負壓輸出範圍:±4V~±6.5V,級差50mV►可程式控制Boost輸出電壓範圍:4V~7.15V,級差50mV►負載能力:150mA►輸出短路保護
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