AH375

SINGLE PHASE HALL EFFECT LATCH

AH375

Document number: DS31172 Rev. 6 - 2

1 of 9

www.diodes.com

July 2010

© Diodes Incorporated

Description

AH375 is an integrated Hall-Effect latched 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 drain output. An

internal

band-gap

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 (OUT 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 AH375 is available in SIP-3L and SC59 packages.

Features

•

Bipolar Hall-Effect latch sensor

•

2.2V to 20V DC Operating voltage

•

Temperature compensation

•

Open drain pre-driver

•

25mA maximum output sink current

•

Operating temperature: -40

°C to +125°C

•

SIP-3L and SC59 packages

(SC59 is commonly known as SOT23 in Asia)

•

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

Pin Assignments

(Top View)

1. Vdd

2. GND

3. OUT

SIP-3L

1. Vdd

GND 2.

3. OUT

(Top View)

SC59

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

AH375

Output

GND

L

R

C

2

3

1

Vdd