AH3775
HIGH-VOLTAGE MEDIUM-SENSITIVITY HALL EFFECT LATCH
Description Pin Assignments
The AH3775 is a high-voltage medium-sensitivity Hall Effect latch IC
designed for commutation of brushless DC motors, flow meters,
linear encoders and position sensors in industrial and consumer
(Top View)
home appliances and personal care applications. To support wide
range of demanding applications, the design is optimized to operate
over the supply range of 3.0V to 28V. With chopper stabilized 3 OUTPUT
GND 2
architecture and an internal bandgap regulator to provide
1 V
temperature compensated supply for internal circuits, the AH3775
DD
provides a reliable solution over the whole operating range. For
robustness and protection, the device has a reverse blocking diode
SC59 and SOT23
with a Zener clamp on the supply. The output has an overcurrent limit
and a Zener clamp.
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
(Top View)
package is larger than the operate point (B ) the output is switched
OP
on (pulled low). The output is held latched until magnetic flux density
3. OUTPUT
reverses and becomes lower than the release point (B ).
RP
GND
2.
V
1. DD
The magnetic operating and release polarity is opposite for SOT23
and SC59 packages. SOT23 and SIP-3 packages will require south
SIP-3
pole to the part marking side to operate while SC59 will require south
pole to the non-part marking side.
Features Applications
Bipolar Latch Operation (South Pole: On, North Pole: off) Brushless DC Motor Commutation
3.0V to 28V Operating Voltage Range Revolution Per Minute (RPM) Measurement
Medium Sensitivity: B and B of +70G and -70G Typical
OP RP Flow Meters
Single, Open-Drain Output with Overcurrent Limit Angular and Linear Encoder and Position Sensors
Chopper Stabilized Design Provides: Contactless Commutation, Speed Measurement and Angular
- Superior Temperature Stability
Position Sensing/Indexing in Consumer Home Appliances, Office
- Minimal Switch Point Drift Equipments and Industrial Applications
- Enhanced Immunity to Stress
Good RF Noise Immunity
Reverse Blocking Diode and Zener Clamp on Supply
-40C to +125C 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) compliant.
2. See Low-Pass Filter
Sample and
Hold
Dynamic Offset
Cancellation
AH3775
Typical Applications Circuit
3.0V to 28V
V
DD
R
L
OUTPUT
AH3775
C
IN
GND
Note: 4. C is for power stabilization and to strengthen the noise immunity, the recommended capacitance is 10nF ~ 100nF. R is the pull-up resistor.
IN L
Pin Descriptions
Package: SC59, SOT23 and SIP-3
Pin Number Pin Name Function
1 Power Supply Input
V
DD
2 GND Ground
3 OUTPUT Output Pin
Functional Block Diagram
V
DD
Power
switch
To All Subcircuits
OUTPUT
Amp Amp
Control
Current
Limit
GND
2 of 14
AH3775 September 2015
Diodes Incorporated
www.diodes.com
Document number: DS37900 Rev. 1 - 2