Data Sheet
HIGH VOLTAGE HALL EFFECT LATCH
General Description
The AH266 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 darlington open-collector drivers
for sinking large load current. It also includes an inter-
nal 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 B
OP
, 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 B
RP,
then causes DO to be turned high (off) and DOB
turned low (on).
AH266 is available in TO-94 (SIP-4L) package.
AH266
Features
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On-Chip Hall Sensor
4V to 30V Supply Voltage
400mA (avg) Output Sink Current
Build in Protection Diode for Reverse Power
Connecting
-20
o
C to 85
o
C Operating Temperature
Low Profile TO-94 (SIP-4L) Package
Build in Over Temperature Protection Function
ESD Rating: 300V(Machine Model)
Applications
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12V/24V Dual-Coil Brushless DC Motor/Fan
Power Supply and Switchboard
Communications Facilities
Industrial Equipment
TO-94
Figure 1. Package Type of AH266
Feb. 2007 Rev. 1. 1
1
BCD Semiconductor Manufacturing Limited
BCDSEMI [ BCD SEMICONDUCTOR MANUFACTURING LIMITED ]
