Diodes AH277A User Manual
Data Sheet
COMPLEMENTARY OUTPUT HALL EFFECT LATCH AH277A
General Description
The AH277A is an integrated Hall sensor with output
driver designed for electronic commutation of brushless DC motor applications. The device includes an onchip Hall sensor for magnetic sensing, an amplifier
that amplifies the Hall voltage, a Schmitt trigger to
provide switching hysteresis for noise rejection, a temperature compensation circuit to compensate the temperature 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
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
then causes DO to be turned high (off) and DOB
turned low (on).
AH277A is available in TO-94 (SIP-4L) package.
OP
, the
RP,
Features
· On-Chip Hall Sensor
· 3.5V to 16V Supply Voltage
· 400mA (avg) Output Sink Current
· Reversed Supply Voltage Protection
o
· -20
· Low Profile TO-94 (SIP-4L) Package
· ESD Rating: 300V (Machine Model)
C to 85oC Operating Temperature
Applications
· Dual-Coil Brushless DC Motor
· Dual-Coil Brushless DC Fan
· Revolution Counting
· Speed Measurement
TO-94
Figure 1. Package Type of AH277A
Oct. 2009 Rev. 1. 6 BCD Semiconductor Manufacturing Limited
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Data Sheet
COMPLEMENTARY OUTPUT HALL EFFECT LATCH AH277A
Pin Configuration
Z4 Package
(TO-94)
Pin Description
Pin Number Pin Name Function
1
2 DO Output 1
3 DOB Output 2
4 GND Ground
4
3
2
1
Figure 2. Pin Configuration of AH277A (Front View)
V
CC
Supply voltage
GND
DOB
DO
V
CC
Oct. 2009 Rev. 1. 6 BCD Semiconductor Manufacturing Limited
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Data Sheet
COMPLEMENTARY OUTPUT HALL EFFECT LATCH AH277A
Functional Block Diagram
V
CC
1
Regulator
Temperature
Compensation
DO
2
4
GND
Hall
Sensor
Ordering Information
Circuit Type
Package
Z4: TO-94 (SIP-4L)
Amplifier
Figure 3. Functional Block Diagram of AH277A
Schmitt
Trigger
Output
Driver
AH277A -
E1: Lead Free
G1: Green
Magnetic Characteristics
A: 10 to 50Gauss
B: 5 to 70Gauss
C: 100Gauss
3
DOB
Package
TO-94
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.
Temperature
Range
-20 to 85
o
C
Lead Free Green Lead Free Green
AH277AZ4-AE1 AH277AZ4-AG1 AH277A AH277A-G1 Bulk
AH277AZ4-BE1 AH277AZ4-BG1 AH277A AH277A-G1 Bulk
AH277AZ4-CE1 AH277AZ4-CG1 AH277A AH277A-G1 Bulk
Part Number Marking ID
Packing
Typ e
Oct. 2009 Rev. 1. 6 BCD Semiconductor Manufacturing Limited
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