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A89331 - Three-Phase Sensorless Fan Driver

General 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.

Key Features

  • 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.

📥 Download Datasheet

Other Datasheets by Allegro MicroSystems

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Full PDF Text Transcription (Reference)

The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

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A89331 Three-Phase Sensorless Fan Driver 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.