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RT4501/A 是用于背光应用的高效率 LED 驱动器,它采用集成了肖特基二极管的异步 Boost 转换器和电流源驱动器,可在 2.5V~5.5V 的输入电压范围内支持每通道6只 LED 的应用。一个可工作在快速模式和高速模式的 I2C 接口可支持其实现对背光的控制,它可以线性映像的方式实现256级亮度调节。同时,它也支持采用 PWM 信号进行亮度调节。在亮度调节方法上,RT4501A 支持以脉冲方式实现128级亮度调节,RT4501则支持以 PWM 调光方式进行256级亮度调节。RT4501/A 具有完善的保护功能,如输入欠压锁定保护、过流、过压保护和过热保护。过压保护的阈值电压可根据不同应用的需要选择为 16V 或 25.5V 。它的封装是 WL-CSP-10B 0.87x2.07。
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