® RT8749A Digital Single-Phase Full Wave BLDC Fan Controller General Description The RT8749A is a highly integrated digital controlled predriver IC for regulating single-phase full wave brushless DC (BLDC) fans at a programmed speed.
The controller IC accepts a Pulse-Width Modulated (PWM) signal provided by the host.
The decoded duty-ratio will then be used for mapping to the programmed speed which is stored at the embedded flash memory.
This speed profile can be programmed by the user for different fan models and applications.
A frequency generator output is included to provide commutation signals to the host to know the current rotating speed.
The control IC also provides several protect...

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