AH280

Hall-Effect Smart Fan Driver

This datasheet contains new product information. Analog 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 plate

- Built-in Zener diode protection for output driver

- Built-in protection diode for power reverse

connecting

- Rotor-lock detection

- Automatically restart after release of motor

locking

- Adjustable auto restart time

- Operating voltage: 3.5~20 V

- Packages: SIP-5L, SOP-8L, SOP-8L EP

- Less external component

Pin Assignments

Front View

( Branded side)

15

4

3

2

SIP-5L

3

4

8

7

6

5

2

1

DO

VCC

NC

DOB

GND

NC

NC

CT

( Top view )

SOP-8L / SOP-8L EP

General Description

AH280 is the integrated Hall sensor owned two

complementary outputs for motor’s coil driving, auto

locked shutdown and auto restart functions.

Functional block diagram includes that a regulator

with

temperature-compensated

band-gap,

an

on-chip Hall voltage generator, a comparator, a

Schmitt trigger and two current output drivers. The

regulator can provide wide operational voltage

range. The Hall voltage generator is to amplify the

Hall voltage due to Hall effect. A Schmitt trigger is

to provide switching Hysteresis for noise rejection.

To avoid coil burning, rotor-lock detection circuit will

shutdown the output driver if detect rotor-lock status.

A rotation recovery circuit is to restart the motor

after rotor-lock is removed. In addition, the auto

re-start time is flexible by adjusting the capacitance

Pin Descriptions

SIP-5L

Symbol P/I/O Pin #

Description

CT

I

1

Timing cap.

VCC

P

2

Positive power supply

DO

O

3

Driver output

DOB

O

4

Driver inverted output

GND

P

5

Ground

SOP-8L/SOP-8L EP

Symbol

Pin #

Description

VCC

1

Positive power supply

DO

2

Driver output

DOB

3

Driver inverted output

NC

4,6,7

Not connected for SOP8

CT

8

Timing cap.

GND

5

Ground