Diodes AH337 User Manual

AH337

SINGLE PHASE HALL EFFECT SWITCH

Description

AH337 is an unipolar Hall-Effect sensor for contactless switching applications. The device includes an on-chip Hall voltage generator for magnetic sensing, an amplifier that amplifies the Hall voltage, a Schmitt trigger to provide switching hysteresis for noise rejection, and an open-collector output. The band-gap regulator allows a wide operating voltage 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 falls below Brp. When B is less than Brp, the output is switched off.

The AH337 is available in SIP-3L and SC59 packages.

Features

• Unipolar Hall-Effect sensor

• 4.2V to 28V 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)

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.

Pin Assignments

(Top View)

SIP-3L

(Top View)

GND 2.

SC59

Applications

• VCD/DVD Loader, CD/DVD ROM

• Cover Detector

• Speed Measurement

• Home Appliances

• Home Safety

3.

2.

1.

3. OUT

1. Vdd

OUT GND

Vdd

Typical Application Circuit

AH337

Document number: DS31050 Rev. 9 - 2

4.2V ~28V

Vdd

AH337

GND

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R

L

Output

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)

Pin Descriptions

Pin Name P/I/O Pin # Description

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

Functional Block Diagram

V

dd

1

AH337

SINGLE PHASE HALL EFFECT SWITCH

Regulator

OUT

3

Hall

2

plate

Amp

2

GND

Absolute Maximum Ratings (T

Symbol Characteristics Values Unit

Vdd Supply Voltage 30 V

B Magnetic Flux Density Unlimited

VDS Output OFF Voltage 30 V

Id Output “ON” Current Continuous 25 mA

TS Storage Temperature Range -65~+150

T

Maximum Junction Temperature 150

J(MAX

PD Package Power Dissipation

= 25°C)

A

SIP-3L 550

SC59

230 mW

°C °C

mW

Recommended Operating Conditions

Symbol Parameter Conditions Min

Vdd Supply Voltage (Note 2) Operating 4.2 28 V

TA Operating Ambient Temperature Operating -40

Notes: 2. The output of IC will be switched after the supply voltage is over 4.2V, but the magnetic characteristics won't be normal until the

AH337

Document number: DS31050 Rev. 9 - 2

supply is over 4.5V.

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Max

125

Unit

°C

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AH337

)

SINGLE PHASE HALL EFFECT SWITCH

Electrical Characteristics (T

Symbol Characteristic Test Conditions Min Typ. Max Unit

V

Output Saturation Voltage Iout = 10mA, B > Bop - 300 400 mV

DS (SAT

Ioff Output Leakage Current B < Brp Idd Supply Current Output Open - 2 4 mA

Magnetic Characteristics (T

Symbol Parameter Min Typ. Max Unit

Bops(south pole to brand side) Operation Point 90 120 150 Gauss

Brps(south pole to brand side) Release Point 30 60 90 Gauss

Bhy(|Bopx|-|Brpx|) Hysteresis - 60 - Gauss

Notes: 3. Magnetic characteristics may vary with supply voltage, operating temperature and after soldering.

= 25°C, Vdd = 12V)

A

= 25°C, Vdd = 4.5V to 28V, Note 3)

A

< 0.1

10 uA

(1mT = 10 Gauss)

Operating Characteristics

Output

)

S

( off - state )

V

dd

Marking side

N

(SC59)

N

(SIP-3 L )

Marking side

Voltage

Turn off

Output (

V

SAT

B

hy

Brp Bop0

( Magnetic flux density B )

Turn on

( on - state )

AH337

Document number: DS31050 Rev. 9 - 2

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July 2010