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A4942 Datasheet Three-Phase Sensorless Fan Driver

Manufacturer: Allegro MicroSystems

General Description

TheA4942 three phase motor driver incorporates BEMF sensing to eliminate the requirement for Hall sensors in fan applications.

A closed loop speed control system is integrated into the IC.

This allows accurate setting of maximum and minimum speeds via selection of external resistors.

Overview

A4942 Three-Phase Sensorless Fan Driver.

Key Features

  • Sensorless (no Hall sensors required).
  • Closed loop speed control.
  • Minimal external components.
  • PWM speed input.
  • FG speed output.
  • Lock detection.
  • Soft start.
  • Overcurrent protection.
  • Soft switching for reduced audible noise Package: 20-contact QFN (suffix ES) Not to scale.