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AH3782 Datasheet PDF - Diodes

Part Number AH3782
Description HIGH-SENSITIVITY HALL EFFECT LATCH
Manufacturers Diodes 
Logo Diodes Logo 

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AH3782 datasheet, circuit
Description
AH3782
HIGH-VOLTAGE, HIGH-SENSITIVITY HALL EFFECT LATCH
WITH INTERNAL PULL-UP RESISTOR
Pin Assignments
The AH3782 is a high-voltage, high-sensitivity Hall Effect latch IC
with internal pull-up resistor 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 has been 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 AH3782 provides a reliable solution over the whole
operating range. For robustness and protection, the device has a
Zener clamp on the supply. The output has an overcurrent limit and a
Zener clamp.
(Top View)
GND 2
3 OUTPUT
1 VDD
SC59 and SOT23
The internally pulled-up 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 part
marking surface 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).
The magnetic operating and release polarity is opposite for SOT23
and SC59 packages. SOT23 and SIP-3 packages will require South
pole to the part marking side to operate while SC59 will require North
pole to the part marking side.
(Top View)
SIP-3
3. OUTPUT
2. GND
1. VDD
Features
Bipolar Latch Operation (South Pole: On, North Pole: off)
3.0V to 28V Operating Voltage Range
High Sensitivity: BOP and BRP of +40G and -40G Typical
Internally Pull-up Resistor on the Output Pin
Output Overcurrent Limit
Chopper Stabilized Design Provides
- Superior Temperature Stability
- Minimal Switch Point Drift
- Enhanced Immunity to Stress
Good RF Noise Immunity
Zener Clamp on Supply and Output Pins
-40°C 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)
Applications
Brushless DC Motor Commutation
Revolution Per Minute (RPM) Measurement
Flow Meters
Angular and Linear Encoder and Position Sensors
Contact-less Commutation, Speed Measurement and Angular
Position Sensing/Indexing in Consumer Home Appliances, Office
Equipments and Industrial Applications
Notes:
1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant.
2. See http://www.diodes.com/quality/lead_free.html 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.
AH3782
Document number: DS38083 Rev. 1 - 2
1 of 14
www.diodes.com
September 2015
© Diodes Incorporated

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AH3782 equivalent
Typical Operating Characteristics
Magnetic Operating Switch Points BOP and BRP
100 TA = +25oC
80
60
40
20
0
-20
-40
-60
-80
-100
2468
Hyst
Bop
Brp
10 12 14 16 18 20 22 24 26 28 30
Supply Voltage (V)
Switch Points Bop and Brp vs Supply Voltage
AH3782
100 VDD = 3V
80
60
40
20
0
-20
-40
-60
-80
-100
-50
-25
0
Hyst
Bop
Brp
25 50 75 100 125 150
Temperature (oC)
Switch Points Bop and Brp vs Temperature
100 VDD = 12V
80
60
40
20
0
-20
-40
-60
-80
-100
-50
-25
0
Hyst
Bop
Brp
25 50 75 100 125 150
Temperature (oC)
Switch Points Bop and Brp vs Temperature
Supply Current
7.0
TA = +25 C
6.0
5.0
4.0
3.0
2.0
1.0
0.0
2 4 6 8 10 12 14 16 18 20 22 24 26 28 30
Supply Voltage (V)
Supply Current vs Supply Voltage
100 VDD = 28V
80
60
40
20
0
-20
-40
-60
-80
-100
-50
-25
0
Hyst
Bop
Brp
25 50 75 100 125 150
Temperature (oC)
Switch Points Bop and Brp vs Temperature
7.0
28V
6.0
5.0
4.0
3.0
2.0 12V
3V
1.0
0.0
-50 -40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90 100 110 120 130
Temperature (oC)
Supply Current vs Temperature
AH3782
Document number: DS38083 Rev. 1 - 2
5 of 14
www.diodes.com
September 2015
© Diodes Incorporated

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Information Total 14 Pages
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