Document
AH3775
HIGH-VOLTAGE MEDIUM-SENSITIVITY HALL EFFECT LATCH
Description
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 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 architecture and an internal bandgap regulator to provide temperature compensated supply for internal circuits, the AH3775 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.
Pin Assignments
(Top View)
GND 2
3 OUTPUT 1 VDD
SC59 and SOT23
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).
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 south pole to the non-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 • Medium Sensitivity: BOP and BRP of +70G and -70G 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 +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)
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.
AH3775
Document number: DS37900 Rev. 1 - 2
1 of 14 www.diodes.com
September 2015
© Diodes Incorporated
Typical Applications Circuit
3.0V to 28V VDD
AH3775
RL OUTPUT CIN AH3775
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: SC59, SOT23 and SIP-3
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
Low-Pass Filter
Sample and Hold
Dynamic Offset Cancellation
Current Limit
GND
AH3775
Document number: DS37900 Rev. 1 - 2
2 of 14 www.diodes.com
September 2015
© Diodes Incorporated
AH3775
Absolute Maximum Ratings (Notes 5 & 6) (@TA = +25°C, unless otherwise specified.)
Symbol VDD VDDR
VOUT_MAX IOUT
Supply Voltage (Note 6) Reverse Supply Voltage Output off Voltage (Note 6) Continuous Output Current
Characteristic
Value 32 -32 32V 60
Unit V V V mA
IOUT_R
Reverse Output Current
-50 mA
B Magnetic Flux Density
Unlimited
PD Package Power Dissipation
SIP-3 SC59 and SOT23
550 mW 230 mW
Ts Storage Temperature Range
-65 to +165
°C
TJ Maximum Junction Temperature
+150
°C
ESD
Electrostatic Discharge Withstand Capability - Human Body Model
6 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 .