Complementary Output Hall Effect Latch

ATS276/277

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.B1 Mar 17, 2004

1/7

ATC

Features

- On-chip Hall sensor with two different sensitivity

and hysteresis settings for ATS276/277

- 3.5V to 20V operating voltage

- 400mA (avg) output sink current

- Build-in protecting diode only for chip reverse

power connecting

- -20

°C to 85°C operating temperature

- Low profile 4 pin SIP package

Applications

- Dual-coil Brush-less DC Motor

- Dual-coil Brush-less DC Fan

- Revolution Counting

- Speed Measurement

General Description

ATS276/277 are integrated Hall sensors with output

drivers, mainly designed for electronic commutation

of brush-less DC Fan. This IC internally includes

the regulator, protecting diode, Hall plate, amplifier,

comparator,

and

a

pair

of

complementary

open-collector outputs (DO, DOB).

While the magnetic flux density (B) is larger than

operate point (Bop), DO will turn on (low), and

meanwhile DOB will turn off (high). Each output is

latched until B is lower than release point (Brp),

and then DO、DOB transfer each state.

For DC fan application, sometimes need to test

power reverse connection condition. Internal diode

only protects chip-side but not for coil-side. If

necessary, add one external diode to block the

reverse current from coil-side.

Ordering Information

ATS27X X -X X X -X

Packing

Blank : Tube or Bulk

A : Tape & Reel

P: SIP-4L

Package

Lead

L : Lead Free

Blank: Normal

Wafer Body

Magnetic

Characteristics

Blank or

A~Z : if necessary

to specify

276:A or B or C

Part No.

6 : ATS276

7 : ATS277

277:A or B

Typical Application Circuit

12

4

3

27X

coil1

coil2

Vcc

Brush-less DC Fan