ATS177

SINGLE OUTPUT HALL EFFECT LATCH

ATS177

Document number: DS31055 Rev. 6 - 2

1 of 9

www.diodes.com

July 2010

© Diodes Incorporated

Description

ATS177 is an integrated Hall-Effect latch sensor designed for

electronic commutation of brush-less DC motor applications.

The device includes an on-chip Hall voltage generator for

magnetic sensing, a comparator that amplifies the Hall

voltage, and a schmitt trigger to provide switching hysteresis

for noise rejection, and open-collector output. An internal

bandgap regulator provides a temperature compensated

supply voltage for internal circuits and allows a wide operating

supply range.

When the magnetic flux density (B) is larger than operate

point (Bop), output is switched on (DO pin is pulled low). The

output state is held on until a magnetic flux density reversal

falls below Brp. When B is less than Brp, the output is

switched off.

The ATS177 is available in SIP-3L package.

Features

•

Bipolar Hall-Effect latch sensor

•

3.5V to 20V DC operating voltage

•

Temperature compensation

•

Open-collector pre-driver

•

25mA maximum output sink current

•

Built-in reverse polarity protection

•

Operating temperature: -40

°C to +125°C

•

SIP-3L package

•

Green Molding Compound (No Br, Sb) (Note 1)

Pin Assignments

(Top View)

1. Vcc

2. GND

3. DO

SIP-3L

Applications

•

Brush-less DC Motor

•

Brush-less DC Fan

•

Revolution counting

•

Speed measurement

Notes:

1. EU Directive 2002/95/EC (RoHS). All applicable RoHS exemptions applied. Please visit our website at

http://www.diodes.com/products/lead_free.html.

Typical Application Circuit

+12V

U1

ATS177

VCC

1

GND

2

OUTPUT

3

Q1

NPN

Q2

NPN

R1

2K

R2

3K

D1

+

C1

0.47uF

+

C2

0.47uF

L1

L2

Brush-less DC Fan