RT8749 Description
The RT8749 is a highly integrated digital control 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, and decodes the duty-ratio of this PWM signal to 256 counts. The decoded duty-ratio will then be used for mapping to the programmed speed which is stored at the embedded flash memory.
RT8749 Key Features
- Embedded 256 x 16 Bits Flash Memory
- Built-in Low RDS(ON) Power MOSFET
- External PWM Speed Control
- Wide Range External PWM Input Frequency
- Built-in Frequency Generator with Selectable FG
- Built-in Peak Current Limit
- Built-in Motor Lock Protection and Automatic
- Built-in Thermal Shutdown Protection
- Low Power Standby Mode (when PWM Input is
- RoHS pliant and Halogen Free