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PDF AH278 Data sheet ( Hoja de datos )

Número de pieza AH278
Descripción HIGH VOLTAGE HALL EFFECT LATCH
Fabricantes BCD Semiconductor 
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HIGH VOLTAGE HALL EFFECT LATCH
Description
The AH278 is an integrated Hall sensor with output driver
designed for electronic commutation of brushless 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 mag-
netic 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 den-
sity reverses and falls below BRP, then causes DO to be
turned high (off) and DOB turned low (on).
Parametric Table
Supply Current (mA)
Output Saturation Voltage
(24V, 300mA) (V)
Hysteresis (Gauss)
Output Leakage Current (µA)
Package
Product Brief
AH278
12.5
0.25
80
0.1
TO-94
Features
Benefits
· On-Chip Hall Sensor
·www.DataSheet4U.com Good High Temperature Performance
· 4V to 30V Supply Voltage
· With Over Temperature Protection (OTP) function
· 500mA (avg) Output Sink Current
· Very Low Saturation Voltage
· Build in Protection Diode for Reverse Power
· Complementary Output
Connecting
· Optimization Solution: Higher Current at High
· -20oC to 85oC Operating Temperature
Voltage(24V) and Temperature (85oC)
· 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
Additional Available Materials
· Samples
· Data Sheet
· Reliability Report
· ESD Report
Feb. 2007
BCD Semiconductor Manufacturing Limited

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