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A5931 Three Phase Sensorless Fan Drivers

Allegro MicroSystems

A5931 and A5931-3:Three Phase Sensorless Fan Drivers

The A5931 is a three phase sensorless BLDC fan driver IC that incorporates sinusoidal drive to minimize audible noise and vibration.
The A5931-3 is the latest in the family with a new feature that allows user to adjust deceleration speed from Force Open Loop to Close Loop.
A flexible closed-loop speed control system is integrated into the IC. This eliminates the requirement for a microprocessor-based system and minimizes programming requirements.
The A5931 devices are available in both commercial and automotive grade.

Product Number: A5931, A5931-3

Class: Fan, Motor Controllers, Drivers, BLDC Drivers, Fan Drivers

Tag: BLDC Drivers, Three Phase Sensorless Fan Drivers, Motor, Motion, Ignition Controllers & Drivers

180° sinusoidal drive - Low audible noise and vibration
Motor position using Allegro's sensorless algorithm - Eliminates external Hall sensors
Closed-loop speed control
Speed curve configuration via EEPROM
Lock detection
Soft start
Standby mode
Shorted load protection

Part Number Type Output Current Topology Mounting Style Operating Frequency Moisture Sensitive Number of Outputs Maximum Frequency Operating Temperature Voltage - Supply Package Type
A5931 3 Phase 3A Step-Down (Buck) 3 Output 24.4 kHz Yes Lighting - -40 °C ~ 105 °C(TA) 5V ~ 16V 16-lead TSSOP with exposed thermal pad (LP package),
24-contact 4×4mm QFN with exposed thermal pad (suffix ES)

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    Datasheet Download on Nov, 2021

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