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RT8749A 是一款高度整合的数位控制预驱动器 IC，专为单相全波无刷直流风扇的转速控制而设计。此控制器可依据预先设定的转速曲线，精准调节风扇转速，以满足不同系统与散热应用需求。 RT8749A 可接收主机所提供的 PWM 控制讯号，并将解码后的占空比对应至内建快闪记忆体中预先储存的转速设定值。使用者可根据不同风扇型号及应用需求，自行编写与储存专属的转速控制曲线，提高系统设计的弹性。 产品内建频率产生器输出功能，可向主机提供换相讯号，使系统能即时监测风扇实际转速并进行闭回路控制。 RT8749A 同时提供完整的保护机制，包括峰值电流限制保护、过温保护、欠压保护以及马达堵转保护。当马达因异常状况停止转动时，内建自动重新启动电路会在堵转条件解除后自动尝试重新启动马达，以提升系统可靠性与使用稳定性。
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