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RT8576A 是 4 通道 LED 驱动器,每个通道具备 120mA 的 驱动能力。它采用电流模式的 Boost 转换器进行升压,该转换器的工作频率可用 RT 引脚在 100kHz-1MHz 间进行调节,输入电压范围在 9V-28V 之间。Boost 转换器的控制回路自动根据工作电压最高的 LED 串的需要选择并调节其输出电压,因而容许各 LED 串有不同的工作电压。当 LED 串存在任何未连接或断开的故障时,控制回路可自动检测到并断开其输出,因而可以避免过压状态的发生。各 LED 串间的电流可用一只电阻进行设定,串与串间的不一致性在 1.5% 以内,通过在 PWM 引脚输入 PWM 信号可对各 LED 串的电流进行调节。当有过压保护、短路或过热等异常状态发生时,有状态信号可被发送给系统,系统可使 RT8576A 进入关机状态。
输入电压范围:9V-28V
Boost 转换器工作频率可调范围:100kHz-1MHz
通道电流最大可调值:120mA
通道电流一致性误差:1.5%
外接调光控制
Boost 转换器开关过流保护
自动 LED 开路、短路保护
输入欠压闭锁保护
输出过压保护阈值可调
过热关机保护
过压保护、短路、过热等异常状态指示
符合 ROHS 规范,不含卤素
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