Diodes AH276 User Manual
Data Sheet
COMPLEMENTARY OUTPUT HALL EFFECT LATCH AH276
General Description
The AH276 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).
AH276 is available in TO-94 (SIP-4L) package.
OP
, the
RP,
Features
· On-Chip Hall Sensor
· 3.5V to 16V Supply Voltage
· 350mA (avg) Output Sink Current
· Reversed Supply Voltage Protection
· Build in Over Temperature Protection Function
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 AH276
Nov. 2009 Rev. 1. 4 BCD Semiconductor Manufacturing Limited
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Data Sheet
COMPLEMENTARY OUTPUT HALL EFFECT LATCH AH276
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 AH276 (Front View)
V
CC
Supply voltage
GND
DOB
DO
V
CC
Nov. 2009 Rev. 1. 4 BCD Semiconductor Manufacturing Limited
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Data Sheet
COMPLEMENTARY OUTPUT HALL EFFECT LATCH AH276
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 AH276
Schmitt
Trigger
Over
Temperature
Protection
Output
Driver
AH276 -
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
o
-20 to 85
C
Lead Free Green Lead Free Green
AH276Z4-AE1 AH276Z4-AG1 AH276Z4-E1 AH276Z4-G1 Bulk
AH276Z4-BE1 AH276Z4-BG1 AH276Z4-E1 AH276Z4-G1 Bulk
AH276Z4-CE1 AH276Z4-CG1 AH276Z4-E1 AH276Z4-G1 Bulk
Part Number Marking ID
Packing
Typ e
Nov. 2009 Rev. 1. 4 BCD Semiconductor Manufacturing Limited
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