THREE-PHASE SINE-WAVE SENSOR-LESS FAN MOTOR DRIVER

DESCRIPTION

The UF2768 provides all the circuitry for sensor-less speed

control of three-phase brushless DC motor. The Sine-wave

Driver Method will be better low-noise. The controller functions

include start-up circuit, back-EMF commutation control, Pulse

Width Modulation (PWM) speed control, lock protection, and

thermal shutdown circuit.

The UF2768 is suitable for both game machine and CPU

cooler that need silent drivers.

FEATURES

* Three-Phase class sin wave driver method

* Three-Phase Full-Wave Sensor-Less Drive Method

* Adjustable Forced Commutation Frequency (for Start-up)

* Built-In External PWM Speed Control

* Built-In Quick Start Function

* FG (Rotation Speed Detection) Output

* Soft Switching Circuit (for Noise Reducing)

* Power Saving Function (PWM Duty Input is 0%)

* Built-In Lock Protection and Auto Restart Function

* Thermal Shutdown Circuit