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A4941

Part Number	A4941
Manufacturer	Allegro Micro Systems
Description	Three-Phase Sensorless Fan Driver
Published	Sep 29, 2014
Detailed Description	A4941 Three-Phase Sensorless Fan Driver Features and Benefits • Sensorless (no Hall sensors required) • Soft switching f...
Datasheet	A4941 PDF File

Overview

A4941 Three-Phase Sensorless Fan Driver Features and Benefits • Sensorless (no Hall sensors required) • Soft switching for reduced audible noise • Minimal external components • PWM speed input • FG speed output • Low power standby mode • Lock detection • Optional overcurrent protection • Variant A automotive qualified to AEC-Q100 Grade 2 Description The A4941 three-phase motor driver incorporates BEMF sensing to eliminate the requirement for Hall sensors in fan applications.
A pulse wave modulated (PWM) input is provided to control motor speed, allowing system cost savings by eliminating external variable power supply.
PWM input can also be used as an on/off switch to disable motor operatio...

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