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).