AH278Z4-AE1 データシートの表示（PDF） - BCD Semiconductor

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AH278Z4-AE1

HIGH VOLTAGE HALL EFFECT LATCH

BCD Semiconductor 

Data Sheet

HIGH VOLTAGE HALL EFFECT LATCH

General Description

Features

AH278

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 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).

· On-Chip Hall Sensor

· 4V to 30V Supply Voltage

· 500mA (avg) Output Sink Current

· Build in Protection Diode for Reverse Power

Connecting

· -20oC to 85oC 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

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

Feb. 2007 Rev. 1. 1

TO-94

Figure 1. Package Type of AH278

BCD Semiconductor Manufacturing Limited

1

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