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RT8420是一款高效率的电流连续模式电感降压转换器,被设计用于从比LED串电压高的电压源对单只或多只串联连接的LED进行驱动,其工作电压范围是7V-50V,采用滞回式控制方式,使用高端电流检测电阻对流过LED的电流进行参数设定。RT8420采用功率开关在低端、输出电流检测在高端的电路结构,只需一只外接电阻即可对需要的平均输出电流进行设定。LED的亮度可通过模拟调光信号进行控制,当亮度百分比较低时,最高开关工作频率会受到限制。RT8420采用具有外露散热焊盘的MSOP-8和PSOP-8封装,具有很好的散热能力。
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