The A89331 three phase motor driver incorporates Sensorless sinusoidal drive to minimize vibration for 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. 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 A89331 is available in a 28L 5x5 QFN with exposed power pad, (suffix ET), and a 20L TSSOP with exposed power pad (suffix LP).