Diodes AH477A Manuel d'utilisateur télécharger pdf

SINGLE PHASE HALL EFFECT LATCH AH477A

Oct. 2009 Rev. 1. 2 BCD Semiconductor Manufacturing Limited

Data Sheet

General Description

The AH477A is an integrated Hall sensor with H-

bridged output driver designed for brushless DC motor

applications. The device includes an on-chip Hall sen-

sor for magnetic sensing, an amplifier that amplifies

the Hall voltage, a comparator to provide switching

hysteresis for noise rejection, a bi-directional drivers

for sinking and driving large current load. It also

includes an internal bandgap regulator to provide tem-

perature compensated bias for internal circuits and

allows a wide operating supply voltage range.

Placing the device in a variable magnetic field, if the

magnetic flux density is larger than threshold B

, the

DO is turned to sink and DOB is turned to drive. This

output state is held until the magnetic flux density

reverses and falls below B

RP,

then causes DO to be

turned to drive and DOB turned to sink.

The AH477A is available in TO-94 (SIP-4L) package.

Features

· On-Chip Hall Sensor

· Operating Voltage: 3.5V to 18V

· H-Bridge Output Drivers for Single Coil

· Internal Bandgap Regulator for Temperature

Compensation

· Low Output Switching Current Noise

· Operating Temperature: -20

C to 85

· Low Profile TO-94 (SIP-4L) Package

· ESD Rating: 6000V (Human Body Model)

· Suitable for PWM Power Supply Control Speed

Applications

· Single-coil Brushless DC Motor

· Single-coil Brushless DC Fan

Figure 1. Package Type of AH477A

TO-94

1 2 3 4 5 6 7 8 9 10

Résumé du contenu

Page 1 - Applications

SINGLE PHASE HALL EFFECT LATCH AH477A 1Oct. 2009 Rev. 1. 2 BCD Semiconductor Manufacturing

Page 2 - Pin Description

IMPORTANT NOTICE BCD Semiconductor Manufacturing Limited reserves the

Page 3 - Ordering Information

SINGLE PHASE HALL EFFECT LATCH AH477A 2Oct. 2009 Rev. 1. 2 BCD Semiconductor Manufacturing

Page 4

SINGLE PHASE HALL EFFECT LATCH AH477A 3Oct. 2009 Rev. 1. 2 BCD Semiconductor Manufacturing

Page 5 - Electrical Characteristics

SINGLE PHASE HALL EFFECT LATCH AH477A 4Oct. 2009 Rev. 1. 2 BCD Semiconductor Manufacturing

Page 6

5Oct. 2009 Rev. 1. 2 BCD Semiconductor Manufacturing LimitedSINGLE PHASE HALL EFFECT LATCH

Page 7 - (Continued)

SINGLE PHASE HALL EFFECT LATCH AH477A 6Oct. 2009 Rev. 1. 2 BCD Semiconductor Manufacturing

Page 8 - vs. Ambient Temperature

7Oct. 2009 Rev. 1. 2 BCD Semiconductor Manufacturing LimitedSINGLE PHASE HALL EFFECT LATCH

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

SINGLE PHASE HALL EFFECT LATCH AH477A 8Oct. 2009 Rev. 1. 2 BCD Semiconductor Manufacturing

Page 10

9Oct. 2009 Rev. 1. 2 BCD Semiconductor Manufacturing LimitedSINGLE PHASE HALL EFFECT LATCH

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