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Diodes Semiconductor Electronic Components Datasheet

AH3781 Datasheet

HIGH-VOLTAGE HIGH-SENSITIVITY HALL EFFECT LATCH

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AH3781 pdf
Description
AH3781
HIGH-VOLTAGE HIGH-SENSITIVITY HALL EFFECT LATCH
WITH INTERNAL PULL-UP RESISTOR
Pin Assignments
The AH3781 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, consumer home appliance 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
AH3781 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
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).
(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 +25G and -25G 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 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
Contactless 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.
AH3781
Document number: DS37903 Rev. 1 - 2
1 of 13
www.diodes.com
September 2015
© Diodes Incorporated



Diodes Semiconductor Electronic Components Datasheet

AH3781 Datasheet

HIGH-VOLTAGE HIGH-SENSITIVITY HALL EFFECT LATCH

No Preview Available !

AH3781 pdf
Typical Applications Circuit
3.0V to 28V
VDD
AH3781
CIN
AH3781
OUTPUT
GND
Note:
4. CIN is for power stabilization and to strengthen the noise immunity, the recommended capacitance is 10nF ~ 100nF. RL is the pull-up resistor.
Pin Descriptions
Package: SOT23
Pin Number
1
2
3
Pin Name
VDD
GND
OUTPUT
Power Supply Input
Ground
Output Pin
Function
Functional Block Diagram
VDD
Power
switch
To All Subcircuits
Amp
Amp
Control
OUTPUT
Current
Limit
GND
AH3781
Document number: DS37903 Rev. 1 - 2
2 of 13
www.diodes.com
September 2015
© Diodes Incorporated



Diodes Semiconductor Electronic Components Datasheet

AH3781 Datasheet

HIGH-VOLTAGE HIGH-SENSITIVITY HALL EFFECT LATCH

No Preview Available !

AH3781 pdf
AH3781
Absolute Maximum Ratings (Notes 5 & 6) (@TA = +25°C, unless otherwise specified.)
Symbol
VDD
VDDR
VOUT_MAX
IOUT
B
PD
Ts
TJ
ESD
Supply Voltage (Note 6)
Reverse Supply Voltage
Output Off Voltage (Note 6)
Continuous Output Current
Magnetic Flux Density
Characteristic
Package Power Dissipation
Storage Temperature Range
Maximum Junction Temperature
Electrostatic Discharge Withstand Capability - Human Body Model
SIP-3
SOT23
Value
32
-0.3
32V
60
Unlimited
550
230
-65 to +165
+150
6
Unit
V
V
V
mA
mW
mW
°C
°C
kV
Notes:
5. Stresses greater than the 'Absolute Maximum Ratings' specified above may cause permanent damage to the device. These are stress ratings only;
functional operation of the device at these or any other conditions exceeding those indicated in this specification is not implied. Device reliability may be
affected by exposure to absolute maximum rating conditions for extended periods of time.
6. The absolute maximum VDD of 32V is a transient stress rating and is not meant as a functional operating condition. It is not recommended to
operate the device at the absolute maximum rated conditions for any period of time.
Recommended Operating Conditions (@TA = -40°C to +125°C, unless otherwise specified.)
Symbol
VDD
TA
Parameter
Supply Voltage
Operating Temperature Range
Operating
Operating
Conditions
Rating
3.0 to 28
-40 to +125
Unit
V
°C
Electrical Characteristics (Note 7 & 8) (@TA = -40°C to +125°C, VDD = 3V to 28V, unless otherwise specified.)
Symbol
Parameter
Conditions
Min Typ Max Unit
VOUT_ON
IOUT_OFF
Output On Voltage
Output Leakage Current
IOUT = 20mA, B > BOP
VOUT = 28V, B < BRP, Output off
-
0.2 0.4
V
-
<0.1
15
µA
IDD Supply Current
Output open, VDD = 12V , TA = +25°C
Output open, TA = -40°C to +125°C
RPU Internal Pull-Up Resistance
TA = -40°C to +125°C
tST Device Start-Up Time
VDD >= 3V, B > BOP (Note 7)
fc Chopping Frequency
VDD = 3V to 28V
The time delay from magnetic
td threshold reached to the start of the (Note 9)
output rise or fall
- 3.8 4.9 mA
- 3.8 5.8 mA
10 14 18 k
- 10
µs
- 800 - kHz
- 3.75 -
µs
Output Rising Time
tr (external pull-up resistor RL and load RL =1kΩ, CL = 20pF
capacitance dependent)
- 0.2 1 µs
Output Falling Time
tf (Internal switch resistance and load RL =1kΩ, CL = 20pF
capacitance dependent)
- 0.1 1 µs
IOCL Output Current Limit
B > BOP, (Note 10 )
30 - 55 mA
VZ Zener Clamp Voltage
IDD = 5mA
28 - - V
Notes: 7. When power is initially turned on, VDD must be within its correct operating range (3.0V to 28V) to guarantee the output sampling. The output state is valid
after the start-up time of 10µs typical from the operating voltage reaching 3V.
8. Typical values are defined at TA = +25°C, VDD = 12V. Maximum and minimum values over the operating temperature range is not tested in production
but guaranteed by design, process control and characterization
9. Guaranteed by design, process control and characterization. Not tested in production.
10. The device will limit the output current IOUT to current limit of IOCL.
AH3781
Document number: DS37903 Rev. 1 - 2
3 of 13
www.diodes.com
September 2015
© Diodes Incorporated




Part Number AH3781
Description HIGH-VOLTAGE HIGH-SENSITIVITY HALL EFFECT LATCH
Maker Diodes
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