Diodes AH276Q User Manual download pdf

AH276Q

Document number: DS31066 Rev. 6 - 2

1 of 6

www.diodes.com

September 2013

H276Q

COMPLEMENTARY OUTPUT HALL EFFECT LATCH

Description

AH276 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.

Features

 On-chip Hall sensor with two different sensitivity and hysteresis

settings for AH276

 Built-in protecting diode only for chip reverse power connecting

 -20°C to +85°C operating temperature

 Lead Free Package: SIP-4L

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

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

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

Pin Assignments

276

12 43

1 : Vcc

2 : DO

3 : DOB

4 : GND

( Top View )

Applications

 Dual-coil Brush-less DC Motor

 Dual-coil Brush-less 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

Brush-less DC Fan



Green

1 2 3 4 5 6

Summary of Contents

Page 1 - ( Top View )

AH276Q Document number: DS31066 Rev. 6 - 2 1 of 6 www.diodes.com September 2013© Diodes Incorporated AH276QCOMPLEMENTARY OUTPUT HALL EFFECT LATCH

Page 2 - Note: 3. P

AH276Q Document number: DS31066 Rev. 6 - 2 2 of 6 www.diodes.com September 2013© Diodes Incorporated AH276Q Pin Descriptions Pin Name P/I/O Pin

Page 3 - C grade

AH276Q Document number: DS31066 Rev. 6 - 2 3 of 6 www.diodes.com September 2013© Diodes Incorporated AH276Q Recommended Operating Conditions (@TA

AH276Q Document number: DS31066 Rev. 6 - 2 4 of 6 www.diodes.com September 2013© Diodes Incorporated AH276Q Performance Characteristics TA (C) 2

Page 5 - Sensor Location

AH276Q Document number: DS31066 Rev. 6 - 2 5 of 6 www.diodes.com September 2013© Diodes Incorporated AH276Q Marking Information 276QPart Numbe

Page 6

AH276Q Document number: DS31066 Rev. 6 - 2 6 of 6 www.diodes.com September 2013© Diodes Incorporated AH276Q IMPORTANT NOTICE DIODES INCORPORATE

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