Diodes AH3761 User Manual

AH3761

HIGH SENSITIVITY HALL EFFECT LATCH

Features

• 3V to 28V DC operation voltage

• Chopper stabilized

• Wide operating voltage range

• Built-in power reverse protection

• Built-in voltage overshoot protection

• Output short circuit protection

• Open drain pre-driver

• SIP3 and SC59 (Commonly known as SOT23 in Asia)

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

• Lead Free Finish/RoHS Compliant (Note 1)

Application

• Brush-less DC Motor Commutation

• RPM Detection

• Consumer and industrial position sensor

• Flow meters

Typical Application Circuit

Vdd

General Description

AH3761 is an integrated Hall effect latched sensor designed for electronic commu ta tion of brush-less DC motor app l ic a ti on s . 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 bandgap regulator is used to provide temperature compensated supply voltage for internal circuits and allows a wide operating supply range.

If a magnetic flux density larger than threshold Bop, DO is turned on (low). The output state is held until a magnetic flux density reversal falls below Brp causing DO to be turned off (high).

R

1

AH3761

3

Output

2

GND

AH3761 Rev. 1 1 of 9 SEPTEMBER 2009

www.diodes.com © Diodes Incorporated

Ordering Information

AH3761

HIGH SENSITIVITY HALL EFFECT LATCH

A H 3 7 6 1 - X G - X

Package

P : SIP3

W : SC59

Green

G : Green

A : Ammo Box (Note 3) B : Bulk (Note 4)

7 : Tape & Reel

Packing

Device

AH3761-PG-A AH3761-PG-B P SIP3 1000 -B NA NA NA NA

AH3761-WG-7 W SC59 NA NA 3000/Tape & Reel -7 NA NA

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

2. Pad layout as shown on Diodes Inc. suggested pad layout document AP02001, which can be found on our website at http://www.diodes.com/datasheets/ap02001.pdf.

3. Ammo Box is for SIP3 Spread Lead.

4. Bulk is for SIP3 Straight Lead.

Package

Code

P SIP3 NA NA NA NA 4000/Box

Packaging

(Note 2)

Bulk 7” Tape and Reel Ammo Box

Quantity

Part

Number

Suffix

Quantity

Part

Number

Suffix

Quantity

Part

Number

Suffix

-A

Pin Assignments

(1) SIP3 (2) SC59

( Top View )

OUT

3.

2.

GND

GND 2.

3.

OUT

1.Vdd

1.

Vdd

Pin Descriptions

Pin Name P/I/O Pin # Description

Vdd P 1 Positive Powe r Supply GND P 2 Ground OUT O 3 Output Pin

AH3761 Rev. 1 2 of 9 SEPTEMBER 2009

www.diodes.com © Diodes Incorporated

T

)

Block Diagram

Vdd

Cancellation

AH3761

HIGH SENSITIVITY HALL EFFECT LATCH

Power sw itch

To All S u b c irc uits

Dynamic Offset

Sample and Hold

Low-Pass Filter

VOU

Amp

Control

Current

Limit

GND

Absolute Maximum Ratings (at T

= 25oC)

A

Symbol Characteristics Values Unit

Vdd Supply Voltage 30 V

Vrdd Reverse Battery Voltage -30 V

B Magnetic Flux Density Unlimited

VDS Output OFF Voltage 30 V

I

Output “On” Current (Peak) 100 mA

O(peak

TST Storage Temperature Range -65~+150

T

Maximum Junction Temperature 150

J(MAX

PD Package Power Dissipation

θ

JC

Thermal Resistance Junction to case

SIP3 550 mW SC59 230 mW SIP3 227 SC59 543

Recommended Operating Conditions

Symbol Characteristic Conditions Min Typ. Max Unit

Vdd Supply Voltage Operating 3 24 28 V

TA Operating Ambient Temperature Operating -40 - 125

°C °C

°C/W °C/W

°C

AH3761 Rev. 1 3 of 9 SEPTEMBER 2009