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A3230 Schematic ( PDF Datasheet ) - Allegro MicroSystems

Teilenummer A3230
Beschreibung Chopper-Stabilized Hall-Effect Bipolar Switch
Hersteller Allegro MicroSystems
Logo Allegro MicroSystems Logo 




Gesamt 12 Seiten
A3230 Datasheet, Funktion
A3230
Chopper-Stabilized Hall-Effect Bipolar Switch
Features and Benefits
Chopper stabilization
Superior temperature stability
Extremely low switchpoint drift
Insensitive to physical stress
Reverse battery protection
Output short circuit protection
Solid state reliability
Small size
Robust EMC capability
High ESD ratings (HBM)
Packages: 3 pin SOT23W (suffix LH), and
3 pin SIP (suffix UA)
Description
The A3230 Hall-effect sensor is a temperature stable, stress-
resistant bipolar switch. This sensor is the most sensitive
Hall-effect device in the Allegro® bipolar switch family and
is intended for ring-magnet sensing. Superior high-temperature
performance is made possible through an Allegro patented
dynamic offset cancellation that utilizes chopper-stabilization.
This method reduces the offset voltage normally caused by
device overmolding, temperature dependencies, and thermal
stress.
The A3230 includes the following on a single silicon chip:
a voltage regulator, Hall-voltage generator, small-signal
amplifier, chopper stabilization, Schmitt trigger, and a short
circuit protected open-drain output. Advanced BiCMOS
wafer fabrication processing takes advantage of low-voltage
requirements, component matching, very low input-offset
errors, and small component geometries.
The A3230 Hall-effect bipolar switch turns on in a south
polarity magnetic field of sufficient strength and switches
off in a north polarity magnetic field of sufficient strength.
Becausewww.DataSheet4U.com the output state is not defined if the magnetic field is
Not to scale
Continued on the next page…
Functional Block Diagram
VCC
Amp
Regulator
To All Subcircuits
Control
Current Limit
VOUT
<1Ω
3230-DS, Rev. 2
GND






A3230 Datasheet, Funktion
A3230
Chopper-Stabilized Hall Effect Bipolar Switch
THERMAL CHARACTERISTICS may require derating at maximum conditions, see application information
Characteristic
Package Thermal Resistance
Symbol
RθJA
Test Conditions*
Package LH, 1-layer PCB with copper limited to solder pads
Package LH, 2-layer PCB with 0.463 in.2 of copper area each side
connected by thermal vias
Package UA, 1-layer PCB with copper limited to solder pads
*Additional thermal information available on Allegro Web site.
Value Units
228 ºC/W
110 ºC/W
165 ºC/W
Power Derating Curve
25
24 VCC(max)
23
22
21
20
19
18
17
16
15
14
13
12
2-layer PCB, Package LH
11 (RθJA = 110 ºC/W)
10
9 1-layer PCB, Package UA
8 (RθJA = 165 ºC/W)
7
6
1-layer PCB, Package LH
5 (RθJA = 228 ºC/W)
4
3
2
VCC(min)
20 40 60 80 100 120 140 160 180
Temperature (ºC)
Power Dissipation versus Ambient Temperature
1900
1800
1700
1600
1500
1400
1300
1200
1100
1000
900
800
700
600
500
400
300
200
100
0
20
(R1θ-JlaAy=e(Rr12θP6J-AlC5ay=BºeC,1r P1/PW0aCc)ºBCk,a/PWga)eckUaAge LH
(1R-θlJaAye=r2P2C8BºC, P/Wac)kage LH
40 60 80 100 120 140 160 180
Temperature (°C)
Allegro MicroSystems, Inc.
6
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com

6 Page









A3230 pdf, datenblatt
A3230
Chopper-Stabilized Hall Effect Bipolar Switch
Package UA, 3-Pin SIP
.164 4.17
.159 4.04
.122 3.10
.117 2.97
D .0805 2.04
NOM
.0565 1.44
NOM D
.085 2.16
MAX
A
.062 1.57
.058 1.47
D
B
.031 0.79
REF
C
.640 16.26
.600 15.24
.017 0.44
.014 0.35
12
3
.019 0.48
.014 0.36
.050 1.27
NOM
Dimensions in inches
Metric dimensions (mm) in brackets, for reference only
A Dambar removal protrusion (6X)
B Ejector mark on opposite side
C Active Area Depth .0195 [0.50] NOM
D Hall element (not to scale)
The products described herein are manufactured under one or more of the following U.S. patents: 5,045,920; 5,264,783; 5,442,283; 5,389,889;
5,581,179; 5,517,112; 5,619,137; 5,621,319; 5,650,719; 5,686,894; 5,694,038; 5,729,130; 5,917,320; and other patents pending.
Allegro MicroSystems, Inc. reserves the right to make, from time to time, such departures from the detail specications as may be required to
permit improvements in the performance, reliability, or manufacturability of its products. Before placing an order, the user is cautioned to verify that
the information being relied upon is current.
Allegro products are not authorized for use as critical components in life-support devices or systems without express written approval.
The information included herein is believed to be accurate and reliable. However, Allegro MicroSystems, Inc. assumes no responsibility for its
use; nor for any infringement of patents or other rights of third parties which may result from its use.
Copyright © 2005, 2006 Allegro MicroSystems, Inc.
Allegro MicroSystems, Inc.
12
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com

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