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AH291

ETC
Part Number AH291
Manufacturer ETC
Description Low Voltage Hall-Effect Smart Fan Motor Controller
Published Apr 16, 2005
Detailed Description AH291 Low Voltage Hall-Effect Smart Fan Motor Controller „ Features - On chip Hall sensor - Rotor-locked shutdown - Auto...
Datasheet PDF File AH291 PDF File

AH291
AH291

Overview
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 „ 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.
To avoid coil burning, rotor-lock shutdown detection circuit shut down the output driver if the rotor is blocked and then the automatic recovery circuit will try to restart the motor.
These protecting actions are repeated and periodic during the blocked period.
Until the blocking is removed, the motor recovers running normally.
- Package: SIP-4L, SOT23-5L, SOT89-5L „ Pin Assignment NC 5 DOB 4 VCC 1 5 NC AH291 7 4 DOB SOT89-5L 291 Front View 1 : VCC 2 : DO 3 : DOB 291 GND 2 1 2 3 4 4 : GND 1 2 SOT2...


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