General Description

The APX9270 is a single phase, DC brushless motor driver with PWM variable speed control and current limit features suitable for the fan of personal computer’s power supply and CPU cooler. The PWM control system includes thermistor input signal and direct PWM input signal, enabling highly silent and low vibration speed control. The device is equipped with a built-in lock protection, which protects the fan when it is locked. It also has rotation speed detection output and thermal protection function.

Features

· Single Phase Full Wave Fan Driver

· Low Quiescent Current (6mA Typical)

· Built-in Variable Speed Function

· Current Limit Circuit (includes both internal and external Current Limit)

· Built-in Lock Protection and Auto Restart Function

· FG (rotation speed detection) Output

· Soft Switching Circuit (before phase change, enabling low-consumption, low loss and low noise drive.)

· Over Voltage Protection (16.5V Typical)

· Built-in Kickback Absorption Circuit

· Built-in Thermal Protection Circuit

· Lead Free and Green Devices Available (RoHS Compliant)

Applications

· CPU Coolers

· Variable Speed Control Fans