Diodes AH375 User Manual

AH375

SINGLE PHASE HALL EFFECT LATCH

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)

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

• Brush-Less DC Motor

• Brush-Less DC Fan

• Revolution Counting

• Speed Measurement

3.

2.

1.

3. OUT

1. Vdd

OUT GND

Vdd

Typical Application Circuit

AH375

Document number: DS31172 Rev. 6 - 2

Vdd

R

L

C

1

AH375

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3

2

GND

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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

AH375

SINGLE PHASE HALL EFFECT LATCH

Regulator

3

OUT

Hall

2

plate

Amp

2

GND

Absolute Maximum Ratings (T

= 25°C)

A

Symbol Characteristics Values Unit

Vdd Supply Voltage 20 V

B Magnetic Flux Density Unlimited

VDS Output OFF Voltage 30 V

Id Output “On” Current Continuous 25

TS Storage Temperature Range -65~+150

T

Maximum Junction Temperature 150

J(MAX

PD Package Power Dissipation

θ

Thermal Resistance

JC

SIP-3L 550

SC59 230

SIP-3L 227

SC59 543

mA

°C °C

mW

°C/W

Recommended Operating Conditions

Symbol Parameter Conditions Min

Vdd Supply Voltage (Note 2) Operating 2.2 20 V

TA Operating Ambient Temperature Operating -40

Notes: 2. The output of IC will be switched after the supply voltage is over 2.2V, but the magnetic characteristics won't be normal until the

AH375

Document number: DS31172 Rev. 6 - 2

supply is over 2.5V.

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Max

125

Unit

°C

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AH375

SINGLE PHASE HALL EFFECT LATCH

Electrical Characteristics (T

Symbol Characteristic Test Conditions Min Typ. Max Unit

V

Output Saturation Voltage Iout = 20mA - 300 700 mV

DS (SAT)

Ioff Output Leakage Current VDD = 14V -

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 5 30 60 Gauss

Brps(south pole to brand side) Release Point -60 -30 -5 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 = 2.5V to 20V, Note 3)

A

<0.1

10 uA

(1mT = 10 Gauss)

Operating Characteristics

Output

Marking side

S

N

(SC59)

S

N

(SIP-3L)

Marking side

(off-state)

Turn off Turn on

Bhy

(Output Voltage)

(on-state)

V

SAT

Brp Bop0

(MagneticFlux Density B)

V

dd

V

SAT

AH375

Document number: DS31172 Rev. 6 - 2

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July 2010