AH281
Hall-Effect Smart Fan Motor Controller


This datasheet contains new product information. Anachip Corp. reserves the rights to modify the product specification without notice. No liability is assumed as a result of the use of
this product. No rights under any patent accompany the sale of the product.
Rev. 0.7 Apr 16, 2004
1/7

„ Features

- On chip Hall sensor
- Rotor-locked shutdown
- Automatically restart
- Built-in Zener protection for output driver
- Operating voltage: 10V~20 V, driver start up: 8V
(minimum)
- Output current:
)AVE(O
I = 300 mA
- Package: SIP-4L, SOT89-5L





„ Pin Assignment

281
12 43
1 : VCC
2 : DO
3 : DOB
4 : GND
Front View
SIP-4L

„ General Description

AH281 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. This function repeats while
rotor is blocked. Until the blocking is removed, the
motor recovers running normally.


„ Pin Descriptions


Name Description
VCC Input power
DO Output pin
DOB Output pin
GND Ground
NC Not connected


1
2
3 74
5
DOBDO
GND
NCVCC
SOT89-5L
AH281


„ Ordering Information

AH281 X -XX X
Packing
Blank : Tube or Bulk
A : Tape & Reel
P: SIP-4L
Package Lead
L : Lead Free
Blank: Normal
Wafer Body
Blank or
A~Z : if necessary
to specify
Y: SOT89-5L