FEATURES AND BENEFITS

• Closed-loop speed control

• Power loss brake

• Fault mode brake

• Configurable rotor detect (RD) or frequency generator

(FG) output

• Speed curve configuration via EEPROM

• I2C serial port

• Sinusoidal modulation for reduced audible noise and low

vibration

• Sensorless (no Hall sensors required)

• Trapezoidal drive option for high speed

• Adjustable gate drive option

• Minimal external components

• PWM duty cycle speed input

• FG speed output

• Lock detection

• Soft start

• Shorted output protection (overcurrent protection, OCP)

APPLICATIONS

• High-speed 12 V server cooling fans

• Industrial and consumer blowers and fans

DESCRIPTION

The A89332 three-phase motor controller incorporates a

sensorless sinusoidal drive to minimize vibration for highpower, high-speed server fans. Sensorless control eliminates

the requirement for Hall sensors for server fan applications.

A flexible, closed-loop speed control system is integrated into

the IC. An EEPROM is used to tailor the common functions of

the fan speed curve to a specific application. This eliminates the

requirement for a microprocessor-based system and minimizes

programming requirements.

The A89332 is available in a 4 × 4 QFN with exposed power

pad (suffix EX).