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Data Sheet |
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COMPLEMENTARY OUTPUT HALL EFFECT LATCH |
AH277A |
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General Description |
Features |
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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 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).
AH277A is available in TO-94 (SIP-4L) package.
·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
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 |
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Pin Configuration
Z4 Package
(TO-94)
4 
GND
3 
DOB
2 
DO
1 
VCC
Figure 2. Pin Configuration of AH277A (Front View)
Pin Description
Pin Number |
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Function |
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VCC |
Supply voltage |
2 |
DO |
Output 1 |
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3 |
DOB |
Output 2 |
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4 |
GND |
Ground |
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Oct. 2009 Rev. 1. 6 |
BCD Semiconductor Manufacturing Limited |
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Data Sheet |
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COMPLEMENTARY OUTPUT HALL EFFECT LATCH |
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AH277A |
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Functional Block Diagram |
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VCC |
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DO |
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1 |
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2 |
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Temperature |
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Regulator |
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Compensation |
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4 |
GND |
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Hall |
Amplifier |
Schmitt |
Output |
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Sensor |
Trigger |
Driver |
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3 |
DOB |
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Figure 3. Functional Block Diagram of AH277A
Ordering Information
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AH277A |
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Circuit Type |
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E1: Lead Free |
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G1: Green |
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Package |
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Magnetic Characteristics |
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Z4: TO-94 (SIP-4L) |
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A: 10 to 50Gauss |
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B: 5 to 70Gauss |
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C: 100Gauss |
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Package |
Temperature |
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Part Number |
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Marking ID |
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Range |
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Type |
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Lead Free |
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Green |
Lead Free |
Green |
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AH277AZ4-AE1 |
AH277AZ4-AG1 |
AH277A |
AH277A-G1 |
Bulk |
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TO-94 |
-20 to 85oC |
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AH277AZ4-BE1 |
AH277AZ4-BG1 |
AH277A |
AH277A-G1 |
Bulk |
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AH277AZ4-CE1 |
AH277AZ4-CG1 |
AH277A |
AH277A-G1 |
Bulk |
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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 |
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