AH3772
HIGH-VOLTAGE, HIGH-SENSITIVITY HALL EFFECT LATCH
Description
Pin Assignments
The AH3772 is a high-voltage, high-sensitivity Hall Effect latch IC
designed for commutation of brushless DC motors, flow meters,
linear encoders, and position sensors in industrial and consumer
home appliances and personal care applications. To support a wide
range of demanding applications, the design is optimized to operate
over the supply range of 3.0V to 28V. With chopper-stabilized
architecture and an internal bandgap regulator to provide
temperature compensated supply for internal circuits, the AH3772
provides a reliable solution over the whole operating range. For
robustness and protection, the device has a reverse-blocking diode
with a zener clamp on the supply. The output has an overcurrent limit
and a zener clamp.
(Top View)
3 OUTPUT
GND 2
1 VDD
SC59 and SOT23
(Top View)
The single open-drain output can be switched on with South pole of
sufficient strength and switched off with North pole of sufficient
strength. When the magnetic-flux density (B) perpendicular to the
package is larger than the operate point (BOP), the output is switched
on (pulled low). The output is held latched until magnetic-flux density
reverses and becomes lower than the release point (BRP).
3. OUTPUT
2. GND
VDD
1.
SIP-3
Applications
Features
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Brushless DC Motor Commutation
Revolution Per Minute (RPM) Measurement
Flow Meters
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Bipolar Latch (South Pole: On, North Pole: Off)
3.0V to 28V Operating Voltage Range
High Sensitivity: BOP and BRP of +25G and -25G Typical
Single, Open-Drain Output with Overcurrent Limit
Chopper-Stabilized Design Provides
Angular and Linear Encoder and Position Sensors
Contactless Commutation, Speed Measurement, and Angular
Position Sensing/Indexing in Consumer Home Appliances, Office
Equipment, and Industrial Applications
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Superior Temperature Stability
Minimal Switch-Point Drift
Enhanced Immunity to Stress
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Good RF Noise Immunity
Reverse-Blocking Diode and Zener Clamp on Supply
-40C to +125°C Operating Temperature
ESD (HBM): 6kV
Industry Standard SC59, SOT23 and SIP-3 Packages
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
Notes:
1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS), 2011/65/EU (RoHS 2) & 2015/863/EU (RoHS 3) compliant.
2. See https://www.diodes.com/quality/lead-free/ for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green" and
Lead-free.
3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and
<1000ppm antimony compounds.
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www.diodes.com
April 2018
© Diodes Incorporated
AH3772
Document number: DS38106 Rev. 2 - 2