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HIGH VOLTAGE HALL EFFECT LATCH AH278

Nov. 2009 Rev. 1. 4 BCD Semiconductor Manufacturing Limited

Data Sheet

General Description

The AH278 is an integrated Hall sensor with output

driver designed for electronic commutation of brush-

less DC motor applications. The device includes an on-

chip Hall sensor for magnetic sensing, an amplifier

that amplifies the Hall voltage, a Schmitt trigger to

provide switching hysteresis for noise rejection 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 and allows a wide operating supply

voltage ranges.

Placing the device in a variable magnetic field, if the

magnetic flux density is larger than threshold B

, 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 B

RP,

then causes DO to be turned high (off) and DOB

turned low (on).

AH278 is available in TO-94 (SIP-4L) package.

Features

· On-Chip Hall Sensor

· 4V to 30V Supply Voltage

· 500mA (avg) Output Sink Current

· Build in Protection Diode for Reverse Power

Connecting

· -20

C to 85

C Operating Temperature

· Low Profile TO-94 (SIP-4L) Package

· Build in Over Temperature Protection Function

· ESD Rating: 300V(Machine Model)

Applications

· 12V/24V Dual-Coil Brushless DC Motor/Fan

· Power Supply and Switchboard

· Communications Facilities

· Industrial Equipment

Figure 1. Package Type of AH278

TO-94

1 2 3 4 5 6 ... 10 11

Résumé du contenu

Page 1 - Applications

HIGH VOLTAGE HALL EFFECT LATCH AH278 1Nov. 2009 Rev. 1. 4 BCD Semiconductor Manufacturing

Page 2 - Pin Description

HIGH VOLTAGE HALL EFFECT LATCH AH278 10Nov. 2009 Rev. 1. 4 BCD Semiconductor Manufacturin

Page 3 - Functional Block Diagram

IMPORTANT NOTICE BCD Semiconductor Manufacturing Limited reserves the

Page 4

HIGH VOLTAGE HALL EFFECT LATCH AH278 2Nov. 2009 Rev. 1. 4 BCD Semiconductor Manufacturing

Page 5 - Magnetic Characteristics

HIGH VOLTAGE HALL EFFECT LATCH AH278 3Nov. 2009 Rev. 1. 4 BCD Semiconductor Manufacturing

Page 6

HIGH VOLTAGE HALL EFFECT LATCH AH278 4Nov. 2009 Rev. 1. 4 BCD Semiconductor Manufacturing

Page 7

5Nov. 2009 Rev. 1. 4 BCD Semiconductor Manufacturing Limited Data SheetHIGH VOLTAGE HALL EFFECT LATCH

Page 8 - (Continued)

HIGH VOLTAGE HALL EFFECT LATCH AH278 6Nov. 2009 Rev. 1. 4 BCD Semiconductor Manufacturing

Page 9 - Typical Applications

7Nov. 2009 Rev. 1. 4 BCD Semiconductor Manufacturing Limited Data SheetHIGH VOLTAGE HALL EFFECT LATCH

Page 10 - Unit: mm(inch)TO-94

HIGH VOLTAGE HALL EFFECT LATCH AH278 8Nov. 2009 Rev. 1. 4 BCD Semiconductor Manufacturing

Page 11

9Nov. 2009 Rev. 1. 4 BCD Semiconductor Manufacturing Limited Data SheetHIGH VOLTAGE HALL EFFECT LATCH

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