EFFECT LATCH. AH277A Datasheet

AH277A LATCH. Datasheet pdf. Equivalent

AH277A Datasheet
Recommendation AH277A Datasheet
Part AH277A
Description COMPLEMENTARY OUTPUT HALL EFFECT LATCH
Feature AH277A; COMPLEMENTARY OUTPUT HALL EFFECT LATCH General Description Features Data Sheet AH277A The AH277A.
Manufacture BCD Semiconductor
Datasheet
Download AH277A Datasheet




BCD Semiconductor AH277A
COMPLEMENTARY OUTPUT HALL EFFECT LATCH
General Description
Features
Data Sheet
AH277A
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 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
· 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)
Applications
· Dual-Coil Brushless DC Motor
· Dual-Coil Brushless DC Fan
· Revolution Counting
· Speed Measurement
AH277A is available in TO-94 (SIP-4L) package.
Oct. 2009 Rev. 1. 6
TO-94
Figure 1. Package Type of AH277A
BCD Semiconductor Manufacturing Limited
1



BCD Semiconductor AH277A
COMPLEMENTARY OUTPUT HALL EFFECT LATCH
Pin Configuration
Z4 Package
(TO-94)
4 GND
3 DOB
2 DO
1 VCC
Figure 2. Pin Configuration of AH277A (Front View)
Data Sheet
AH277A
Pin Description
Pin Number
1
2
3
4
Pin Name
VCC
DO
DOB
GND
Supply voltage
Output 1
Output 2
Ground
Function
Oct. 2009 Rev. 1. 6
BCD Semiconductor Manufacturing Limited
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BCD Semiconductor AH277A
COMPLEMENTARY OUTPUT HALL EFFECT LATCH
Functional Block Diagram
VCC
1
Regulator
Temperature
Compensation
Hall
Sensor
Amplifier
Schmitt
Trigger
Output
Driver
Data Sheet
AH277A
DO
2
4 GND
3
DOB
Figure 3. Functional Block Diagram of AH277A
Ordering Information
AH277A -
Circuit Type
E1: Lead Free
G1: Green
Package
Z4: TO-94 (SIP-4L)
Magnetic Characteristics
A: 10 to 50Gauss
B: 5 to 70Gauss
C: 100Gauss
Package
TO-94
Temperature
Range
-20 to 85oC
Part Number
Lead Free
Green
AH277AZ4-AE1 AH277AZ4-AG1
AH277AZ4-BE1 AH277AZ4-BG1
AH277AZ4-CE1 AH277AZ4-CG1
Marking ID
Lead Free
Green
AH277A
AH277A-G1
AH277A
AH277A-G1
AH277A
AH277A-G1
Packing
Type
Bulk
Bulk
Bulk
BCD Semiconductor's Pb-free products, as designated with "E1" suffix in the part number, are RoHS compliant. Products with
"G1" suffix are available in green package.
Oct. 2009 Rev. 1. 6
BCD Semiconductor Manufacturing Limited
3







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