Diodes AH277A Manuel d'utilisateur télécharger pdf

COMPLEMENTARY OUTPUT HALL EFFECT LATCH AH277A

Oct. 2009 Rev. 1. 6 BCD Semiconductor Manufacturing Limited

Data Sheet

General Description

The AH277A 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, a tem-

perature compensation circuit to compensate the tem-

perature 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 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).

AH277A is available in TO-94 (SIP-4L) package.

Features

· On-Chip Hall Sensor

· 3.5V to 16V Supply Voltage

· 400mA (avg) Output Sink Current

· Reversed Supply Voltage Protection

· -20

C to 85

C Operating Temperature

· Low Profile TO-94 (SIP-4L) Package

· ESD Rating: 300V (Machine Model)

Applications

· Dual-Coil Brushless DC Motor

· Dual-Coil Brushless DC Fan

· Revolution Counting

· Speed Measurement

Figure 1. Package Type of AH277A

TO-94

1 2 3 4 5 6 7 8 9 10

Résumé du contenu

Page 1 - Applications

COMPLEMENTARY OUTPUT HALL EFFECT LATCH AH277A 1Oct. 2009 Rev. 1. 6 BCD Semiconductor Manufacturing Limited

Page 2 - Pin Description

IMPORTANT NOTICE BCD Semiconductor Manufacturing Limited reserves the

Page 3 - Ordering Information

COMPLEMENTARY OUTPUT HALL EFFECT LATCH AH277A 2Oct. 2009 Rev. 1. 6 BCD Semiconductor Manufacturing Limited

Page 4

COMPLEMENTARY OUTPUT HALL EFFECT LATCH AH277A 3Oct. 2009 Rev. 1. 6 BCD Semiconductor Manufacturing Limited

Page 5 - Electrical Characteristics

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Page 9 - Unit: mm(inch)TO-94

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9 Data SheetCOMPLEMENTARY OUTPUT HALL EFFECT LATCH AH277A Oct. 2009 Rev. 1. 6 BCD Semiconductor Manu

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