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Allegro MicroSystems A89332 3-Phase Sensorless Fan Controller

Allegro MicroSystems A89332 3-Phase Sensorless Fan Controller incorporates a sensorless sinusoidal drive to minimize vibration for high-power, 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 tailors 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 4mm × 4mm QFN package with an exposed power pad (suffix EX).

Features

  • 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)
  • 26-contact QFN with exposed pad (EX package)
  • Lead-free

Applications

  • High-speed 12V server cooling fans
  • Industrial and consumer blowers and fans

Specifications

  • -0.3V to 36V supply voltage range
  • -0.3V to 36V control input range
  • -0.3V to 6V logic input voltage range
  • 18V logic output
  • +55°C/W thermal resistance
  • Temperatures
    • +150°C junction
    • -40°C to +105°C operating
    • -55°C to +150°C storage

Typical Application Diagram

Application Circuit Diagram - Allegro MicroSystems A89332 3-Phase Sensorless Fan Controller
Veröffentlichungsdatum: 2022-05-26 | Aktualisiert: 2022-06-01