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AH3776 Datasheet PDF - Diodes

Part Number AH3776
Description HIGH-SENSITIVITY HALL EFFECT LATCH
Manufacturers Diodes 
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AH3776 datasheet, circuit
AH3776
HIGH-VOLTAGE, HIGH-SENSITIVITY HALL EFFECT LATCH
Description
The AH3776 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
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 AH3776
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.
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).
Pin Assignments
(Top View)
GND 2
3 OUTPUT
1 VDD
SOT23
(Top View)
SIP-3
3. OUTPUT
2. GND
1. VDD
Features
Bipolar Latch (South Pole: On, North Pole: off)
3.0V to 28V Operating Voltage Range
High Sensitivity: BOP and BRP of +110G and -110G Typical
Single, Open-Drain Output with Overcurrent Limit
Chopper Stabilized Design Provides
- Superior Temperature Stability
- Minimal Switch Point Drift
- Enhanced Immunity to Stress
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)
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
Equipment 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.
AH3776
Document number: DS38230 Rev. 1 - 2
1 of 13
www.diodes.com
September 2015
© Diodes Incorporated

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AH3776 equivalent
Typical Operating Characteristics
Magnetic Operating Switch Points BOP and BRP
300.0
250.0
TA = +25oC
200.0
150.0
100.0
50.0
0.0
-50.0
-100.0
-150.0
-200.0
-250.0
-300.0
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
AH3776
300.0
250.0
VDD = 3V
200.0
150.0
100.0
50.0
0.0
-50.0
-100.0
-150.0
-200.0
-250.0
-300.0
-50
-25
0
Hyst
Bop
Brp
25 50 75 100 125 150
Temperature (oC)
Switch Points Bop and Brp vs Temperature
300.0
250.0
VDD = 12V
200.0
150.0
100.0
50.0
0.0
-50.0
-100.0
-150.0
-200.0
-250.0
-300.0
-50
-25
0
Hyst
Bop
Brp
25 50 75 100 125 150
Temperature (oC)
Switch Points Bop and Brp vs Temperature
300.0
250.0
VDD = 28V
200.0
150.0
100.0
50.0
0.0
-50.0
-100.0
-150.0
-200.0
-250.0
-300.0
-50
-25
0
Hyst
Bop
Brp
25 50 75 100 125 150
Temperature (oC)
Switch Points Bop and Brp vs Temperature
Supply Current
5.0
TA = +25 C
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
4.0
3.8
3.5
28V
3.3
3.0
2.8
3V 12V
2.5
2.3
2.0
-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
AH3776
Document number: DS38230 Rev. 1 - 2
5 of 13
www.diodes.com
September 2015
© Diodes Incorporated

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Information Total 13 Pages
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