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RT8749 是一款高度集成的数字控制预驱动器 IC，专为单相全波无刷直流风扇的转速控制而设计。该控制器可依据预先设定的转速曲线，精确调节风扇转速，以满足不同系统及散热应用需求。 RT8749 可接收主机提供的 PWM 控制信号，并将解码后的占空比映射至内置闪存中预先存储的转速设定值。用户可根据不同风扇型号及应用需求，自行编写并存储专属的转速控制曲线，提高系统设计灵活性。 产品内置频率发生器输出功能，可向主机提供换相信号，使系统能够实时监测风扇实际转速并进行闭环控制。 RT8749 同时提供完善的保护机制，包括峰值电流限制保护、过温保护、欠压保护以及电机堵转保护。当电机因异常情况停止转动时，内置自动重启电路会在堵转条件解除后自动尝试重新启动电机，从而提升系统可靠性与运行稳定性。
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