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AH291 - LOW VOLTAGE HALL-EFFECT SMART FAN MOTOR CONTROLLER

General Description

AH291 is a monolithic fan motor controller with Hall sensor’s capability.

It contains two complementary open-collector drivers for motor’s coil driving, automatic lock shutdown and restart function relatively.

Key Features

  • On Chip Hall Sensor Rotor-Locked Shutdown Automatically Restart Built-in Zener Protection for Output Driver Operating Voltage: 1.8V~5.75 V Output Current: IO( AVE ) = 400 mA Lead Free Packages: SIP-4L and SOT89-5L General.

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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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AH291 LOW VOLTAGE HALL-EFFECT SMART FAN MOTOR CONTROLLER Features • • • • • • • On Chip Hall Sensor Rotor-Locked Shutdown Automatically Restart Built-in Zener Protection for Output Driver Operating Voltage: 1.8V~5.75 V Output Current: IO( AVE ) = 400 mA Lead Free Packages: SIP-4L and SOT89-5L General Description AH291 is a monolithic fan motor controller with Hall sensor’s capability. It contains two complementary open-collector drivers for motor’s coil driving, automatic lock shutdown and restart function relatively. Rotor-lock shutdown detection circuit turns off the output driver when the rotor is blocked to avoid coil overheat. Then, the automatic recovery circuit will restart the motor. These protected actions are repeated and periodic during the blocked period.