AH266

Document number: DS30876 Rev. 5 - 2

1 of 7

www.diodes.com

December 2013

© Diodes Incorporated

AH266

HIGH VOLTAGE HALL EFFECT LATCH

Description

AH266 is an integrated Hall sensor with output drivers 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, a Schmitt

trigger to provide switching hysteresis for noise rejection, and

complementary Darlington open-collector drivers for sinking large

current loads. An internal band-gap regulator is used to provide

temperature compensated supply voltage for internal circuits and

allows a wide operating supply range.

If a magnetic flux density (B) is larger than operation point (Bop), DO

will turn on (low) and DOB will turn off (high). The output state is

latched prior to reaching release point (Brp). If B< Brp, DO will turn off

and DOB will turn on. AH266 is rated for operation over temperature

range from -20°C to +85°C and voltage range from 4V to 28V. The

devices are available in low cost die forms or rugged 4 pin SIP

packages.

Features



On-Chip Hall Plate



Operating Voltage: 4V to 28V



Output Current: 400mA (Continuous, +25°C)



Reverse Protection Diode Only for Chip Reverse Power

Connecting (Note 1)





Lead Free package: SIP-4



SIP-4: Available in “Green” Molding Compound (No Br, Sb)



RoHS Compliant (Note 2)



Lead-Free Finish; RoHS Compliant (Notes 1 & 2)



Halogen and Antimony Free. “Green” Device (Note 3)

Pin Assignments

Applications



Dual-Coil Brushless DC Motor



Dual-Coil Brushless DC Fan



Revolution Counting



Speed Measurement

Notes:

1. EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant. All applicable RoHS exemptions applied.

2. See http://www.diodes.com/quality/lead_free.html for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green"

and Lead-free.

3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and

<1000ppm antimony compounds.

Typical Applications Circuit

12

4

3

266

Coil 1

Coil 2

Brush-Less DC Fan

266

1 24

3

( Top View )

SIP-4

 

Green