A89332-3 Datasheet | Allegro MicroSystems

Features AND BENEFITS - Closed-loop speed control - Power loss brake - AC Loss IBB control - 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 ponents - PWM duty cycle speed input - FG speed output - Lock detection - Soft start - Overvoltage protection - Shorted output protection (OCP) DESCRIPTION The A89332-3 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 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 A89332-3 is available in a 26-contact 4 mm × 4 mm QFN with exposed power pad (suffix EX). APPLICATIONS - High-speed 12 V server cooling fans - Industrial and consumer blowers and fans PACKAGE 26-Contact QFN with exposed...