OH277

COMPLEMENTARY

COMPLEMENTARY

COMPLEMENTARY

COMPLEMENTARY OUTPUT

OUTPUT

OUTPUT

OUTPUT HALL

HALL

HALL

HALL EFFECT

EFFECT

EFFECT

EFFECT LATCH

LATCH

LATCH

LATCH

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Nanjing

Nanjing

Nanjing

Nanjing Ouzhuo

Ouzhuo

Ouzhuo

Ouzhuo Technology

Technology

Technology

Technology co.,

co.,

co.,

co., Ltd

Ltd

Ltd

Ltd

www.ohhall.com

www.zbling.com

Tel：86-25-52312738，86-25-83247886

FAX: 86-25-52312738

E-mail: ohhall@163.com

Order

Order

Order

Order Information

Information

Information

Information

PN

OH277A/B/C

Temperature Range

-20 to 85°C

Package

1000pcs/bag

General

General

General

General Description

Description

Description

designed for electronic commutation of brushless DC motor applications. The

device includes an onchip Hall sensor for magnetic sensing, an amplifier that

amplifies the Hall voltage, a Schmitt trigger to provide switching hysteresis for

noise rejection, a temperature compensation circuit to compensate the temperature drift of

Hall sensitivity and two complementary open-collector drivers for sinking large load

current. It also includes an internal band-gap regulator which is used to provide bias

voltage for internal circuits. Placing the device in a variable magnetic field, if the magnetic

flux density is larger than threshold BOP, the pin DO will be turned low (on) and pin DOB

will be turned high (off). This output state is held until the magnetic flux density reverses

and falls below BRP, then causes DO to be turned high (off) and DOB turned low (on).

Features

Features

Features

Features

· On-Chip Hall Sensor

· 3.5V to 16V Supply Voltage

· 400mA (avg) Output Sink Current

· Reversed Supply Voltage Protection

· -20oC to 85oC Operating Temperature

· Low Profile TO-94 (SIP-4L) Package

· ESD Rating: 300V (Machine Model)

Functional

Functional

Functional

Functional Block

Block

Block

Block Diagram

Diagram

Diagram

Diagram

Applications

Applications

Applications

Applications

· Dual-Coil Brushless DC Motor

· Dual-Coil Brushless DC Fan

· Revolution Counting

· Speed Measurement