A89331 Datasheet | Allegro MicroSystems

Features AND BENEFITS - Closed-loop speed control - Overvoltage protection - Power loss brake - Fault mode brake - Configurable RD or 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 - Low Rds(on) power MOSFETs - 3 A capability - PWM duty cycle speed input - FG speed output - Lock detection - Soft start - Shorted load protection APPLICATIONS - High-speed 12 V server cooling fans - Industrial and consumer blowers and fans DESCRIPTION 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 mon 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 28-lead 5 mm × 5 mm QFN with exposed power pad (suffix ET), and a 20-lead TSSOP with exposed power pad (suffix LP). PACKAGES: 20-lead TSSOP with 28-contact QFN with exposed thermal pad exposed thermal pad (LP...