EFFECT LATCH. AH278 Datasheet

AH278 LATCH. Datasheet pdf. Equivalent

AH278 Datasheet
Recommendation AH278 Datasheet
Part AH278
Description HIGH VOLTAGE HALL EFFECT LATCH
Feature AH278; HIGH VOLTAGE HALL EFFECT LATCH General Description Features Data Sheet AH278 The AH278 is an int.
Manufacture BCD Semiconductor
Datasheet
Download AH278 Datasheet




BCD Semiconductor AH278
HIGH VOLTAGE HALL EFFECT LATCH
General Description
Features
Data Sheet
AH278
The AH278 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 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 and allows a wide operating supply
voltage ranges.
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
· 4V to 30V Supply Voltage
· 500mA (avg) Output Sink Current
· Build in Protection Diode for Reverse Power
Connecting
· -20oC to 85oC Operating Temperature
· Low Profile TO-94 (SIP-4L) Package
· Build in Over Temperature Protection Function
· ESD Rating: 300V(Machine Model)
Applications
· 12V/24V Dual-Coil Brushless DC Motor/Fan
· Power Supply and Switchboard
· Communications Facilities
· Industrial Equipment
AH278 is available in TO-94 (SIP-4L) package.
Nov. 2009 Rev. 1. 4
TO-94
Figure 1. Package Type of AH278
BCD Semiconductor Manufacturing Limited
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BCD Semiconductor AH278
HIGH VOLTAGE HALL EFFECT LATCH
Pin Configuration
Z4 Package
(TO-94)
4
3
2
1
GND
DOB
DO
VCC
Figure 2. Pin Configuration of AH278 (Front View)
Data Sheet
AH278
Pin Description
Pin Number
1
2
3
4
Pin Name
VCC
DO
DOB
GND
Supply voltage
Output 1
Output 2
Ground
Function
Nov. 2009 Rev. 1. 4
BCD Semiconductor Manufacturing Limited
2



BCD Semiconductor AH278
HIGH VOLTAGE HALL EFFECT LATCH
Functional Block Diagram
VCC
1
Regulator
Over-Temperature
Protection
Hall
Sensor
Amplifier
Schmitt
Trigger
Output
Driver
Data Sheet
AH278
DO
2
4
GND
3
DOB
Figure 3. Functional Block Diagram of AH278
Ordering Information
AH278 -
Circuit Type
Package
Z4: TO-94 (SIP-4L)
E1: Lead Free
G1: Green
Magnetic Characteristics
A: 10 to 70Gauss
B: 100Gauss
Package
TO-94
Temperature
Range
-20 to 85 oC
Part Number
Lead Free
Green
AH278Z4-AE1 AH278Z4-AG1
AH278Z4-BE1 AH278Z4-BG1
Marking ID
Lead Free
Green
AH278Z4-E1
AH278Z4-G1
AH278Z4-E1
AH278Z4-G1
Packing
Type
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.
Nov. 2009 Rev. 1. 4
BCD Semiconductor Manufacturing Limited
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