A3240ELT-TR [ALLEGRO]
SPECIALTY ANALOG CIRCUIT, PSSO3, TO-243AA, SOT-89, 3 PIN;
| 型号： | A3240ELT-TR |
| 厂家： | 
ALLEGRO MICROSYSTEMS |
| 描述： | SPECIALTY ANALOG CIRCUIT, PSSO3, TO-243AA, SOT-89, 3 PIN 开关 斩波器 |
| 文件： | 总10页 (文件大小：192K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
3240
CHOPPER-STABILIZED, PRECISION
HALL-EFFECT SWITCH
The A3240-- Hall-effect switch is an extremely temperature-stable
and stress-resistant sensor especially suited for operation over extended
temperature ranges to +150°C. Superior high-temperature performance
is made possible through dynamic offset cancellation, which reduces the
residual offset voltage normally caused by device overmolding, tempera-
ture dependencies, and thermal stress.
Suffix ‘–LT’ & ‘–UA’ Pinning
(SOT89/TO-243AA & ultra-min SIP)
PTCT
The device includes on a single silicon chip a voltage regulator,
Hall-voltage generator, small-signal amplifier, chopper stabilization,
Schmitt trigger, and a short-circuit protected open-collector output to
sink up to 25 mA. A south pole of sufficient strength will turn the
output on. An on-board regulator permits operation with supply voltages
of 4.2 to 24 volts.
V
CC
1
2
3
The first character of the part number suffix determines the device
operating temperature range; suffix ‘E–’ is for -40°C to +85°C and
‘L–’ is -40°C to +150°C. Three package styles provide a magnetically
optimized package for most applications. Suffix ‘–LH’ is a modified
SOT23W surface-mount package, ‘–LT’ is a miniature SOT89/TO-
243AA transistor package for surface-mount applications; while suffix
‘–UA’ is a three-lead ultra-mini-SIP for through-hole mounting.
Dwg. PH-003-2
Pinning is shown viewed from branded side.
ABSOLUTE MAXIMUM RATINGS
at T = +25°C
A
Supply Voltage, VCC ........................ 26.5 V
Reverse Battery Voltage, VRCC .......... -30 V
Magnetic Flux Density, B ........... Unlimited
Output OFF Voltage, VOUT ................. 26 V
Continuous Output Current,
IOUT .......................................... 25 mA*
Reverse Output Current, IOUT ........ -50 mA
Package Power Dissipation, PD . See Graph
Junction Temperature, TJ ............... +165°C
Operating Temperature Range, TA
FEATURES
■ Resistant to Physical Stress
■ Superior Temperature Stability
■ Output Short-Circuit Protection
■ Operation From Unregulated Supply
■ Reverse Battery Protection
■ Solid-State Reliability
■ Small Size
Suffix ‘E–’.................. -40°C to +85°C
Suffix ‘L–’................ -40°C to +150°C
Storage Temperature Range,
TS .............................. -65°C to +170°C
*Internal current limiting is intended to protect
the device from output short circuits.
Always order by complete part number: the prefix ‘A’ + the basic four-
digit part number + a suffix to indicate operating temperature range +
a suffix to indicate package style, e.g., A3240ELH .
3240
CHOPPER-STABILIZED,
PRECISION
HALL-EFFECT SWITCH
FUNCTIONAL BLOCK DIAGRAM
SUPPLY
TO ALL
SUBCIRCUITS
REG.
OUTPUT
X
CONTROL
CURRENT
LIMIT
<1Ω
GROUND
Dwg. FH-020-1
800
Suffix ‘–LH’ Pinning
(SOT23W)
700
Suffix "–UA"
3
RθJA = 165°C/W
600
500
400
300
200
100
0
Suffix "–LT"
θJA = 180°C/W
Suffix "–LH"
θJA = 228°C/W
R
PTCT
R
V
CC
1
2
Suffix "E–"
Suffix "L–"
140
20
40
60
80
100
120
160
180
Dwg. PH-003-4
°
AMBIENT TEMPERATURE in
C
Dwg. GH-046-2D
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
2
Copyright © 2000, 2003, 2004 Allegro MicroSystems, Inc.
3240
CHOPPER-STABILIZED,
PRECISION
HALL-EFFECT SWITCH
ELECTRICAL CHARACTERISTICS over operating temperature range.
Limits
Typ.
Characteristic
Symbol
Test Conditions
Operating, TJ < 165°C1
VOUT = 24 V, B < BRP
IOUT = 20 mA, B > BOP
B > BOP
Min.
4.2
–
Max.
24
Units
V
Supply Voltage Range
Output Leakage Current
Output Saturation Voltage
Output Current Limit
Power-On Time
VCC
–
–
IOFF
10
µA
VOUT(SAT)
–
185
–
500
60
mV
mA
µs
IOM
tpo
fC
30
VCC
>
4.2
–
Chopping Frequency
Output Rise Time
–
–
–
340
0.2
0.1
kHz
µs
tr
RL = 820 Ω, CL = 20 pF
RL = 820 Ω, CL = 20 pF
B < BRP, VCC
2.0
2.0
Output Fall Time
tf
µs
Supply Current
ICC
=
12
12
V–
V–
3.
4.
B > BOP, VCC
=
Reverse Battery Current
Zener Voltage
ICC
VRCC
=
-30
37
–
VZ + VD
zz + zD
ICC = 15 mA, TA = 25°C
ICC = 15 mA, TA = 25°C
28
–
32
50
V
Zener Impedance
Ω
NOTES:1. Maximum voltage must be adjusted for power dissipation and junction temperature.
2. BOP = operate point (output turns on); BRP = release point (output turns off).
3. Typical Data is at TA = +25°C and VCC = 12 V and is for design information only.
MAGNETIC CHARACTERISTICS over operating supply voltage and temperature ranges.
Limits
Characteristic
Operate Point
Release Point
Hysteresis
Symbol
BOP
Test Conditions
Min.
–
Typ.
35
Max.
50
–
Units
G
BRP
5.0
–
25
G
Bhys
BOP - BRP
10
–
G
NOTES: 1. Typical Data is at TA = +25°C and VCC = 12 V and is for design information only.
2. 1 gauss (G) is exactly equal to 0.1 millitesla (mT).
www.allegromicro.com
3
3240
CHOPPER-STABILIZED,
PRECISION
HALL-EFFECT SWITCH
TYPICAL OPERATING CHARACTERISTICS
as a function of temperature
SWITCH POINTS
50
40
30
OPERATE POINT
RELEASE POINT
20
10
0
V
CC = 4.5 V
VCC = 24 V
-50
-25
0
25
50
75
100
125
150
°
AMBIENT TEMPERATURE IN
C
Dwg. GH-026-5
OUTPUT SATURATION VOLTAGE
SUPPLY CURRENT
300
200
6.0
IOUT = 20 mA
VCC = 12 V
V
CC = 12 V
5.0
4.0
3.0
2.0
OUTPUT ON, B > BOP
100
OUTPUT OFF, B < BRP
0
-50
-25
0
25
50
75
100
125
150
-50
-25
0
25
50
75
100
125
150
°
AMBIENT TEMPERATURE IN C
°
AMBIENT TEMPERATURE IN C
Dwg. GH-029-4
Dwg. GH-028-5
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
4
3240
CHOPPER-STABILIZED,
PRECISION
HALL-EFFECT SWITCH
TYPICAL OPERATING CHARACTERISTICS
as a function of supply voltage
SWITCH POINTS
40
30
20
OPERATE POINT
RELEASE POINT
T
T
A
A
= 150°C
= -40°C
10
0
24
3.0
3.5
4.0
4.5
5.0
SUPPLY VOLTAGE IN VOLTS
Dwg. GH-021-2
OUTPUT SATURATION VOLTAGE
SUPPLY CURRENT
250
225
200
8.0
I
OUT = 20 mA
= 150°C
= +25°C
= -40°C
OUTPUT ON
T
T
T
A
A
A
T
T
T
A
A
A
= 150°C
= +25°C
= -40°C
7.0
6.0
5.0
4.0
3.0
2.0
1.0
0
175
150
24
3.0
4.0
5.0
6.0
7.0
8.0
9.0
10
11
12
3.0
3.5
4.0
4.5
5.0
SUPPLY VOLTAGE IN VOLTS
SUPPLY VOLTAGE IN VOLTS
Dwg. GH-058-4
Dwg. GH-055-1
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5
3240
CHOPPER-STABILIZED,
PRECISION
HALL-EFFECT SWITCH
SENSOR LOCATIONS
Package Designator ‘LH’
ACTIVE AREA DEPTH
0.011"
0.059"
0.28 mm
1.49 mm
NOM
3
0.038"
0.96 mm
A
1
2
Dwg. MH-025
Package Designator ‘LT’
ACTIVE AREA DEPTH
0.0305"
0.088"
0.775 mm
2.24 mm
NOM
0.045"
1.14 mm
A
1
2
3
Dwg. MH-008-8A
Package Designator ‘UA’
ACTIVE AREA DEPTH
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;
0.0195"
0.50 mm
NOM
0.080"
2.04 mm
Allegro
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.
0.056"
1.44 mm
Allegro MicroSystems, Inc. reserves the right to make, from time to
time, such departures from the detail specifications 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.
A
BRANDED
SURFACE
1
2
3
Allegro products are not authorized for use as critical components
in life-support appliances, devices, or systems without express written
approval.
Dwg. MH-011-9B
The information included herein is believed to be accurate and
reliable. However, Allegro MicroSystems, Inc. assumes no responsi-
bility for its use; nor for any infringements of patents or other rights of
third parties that may result from its use.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
6
3240
CHOPPER-STABILIZED,
PRECISION
HALL-EFFECT SWITCH
FUNCTIONAL DESCRIPTION
Chopper-Stabilized Technique. The Hall element can be
REG
considered as a resistor array similar to a Wheatstone bridge. A
large portion of the offset is a result of the mismatching of these
resistors. These devices use a proprietary dynamic offset
cancellation technique, with an internal high-frequency clock to
reduce the residual offset voltage of the Hall element that is
normally caused by device overmolding, temperature dependen-
cies, and thermal stress. The chopper-stabilizing technique
cancels the mismatching of the resistor circuit by changing the
direction of the current flowing through the Hall plate using
CMOS switches and Hall voltage measurement taps, while
maintaing the Hall-voltage signal that is induced by the external
magnetic flux. The signal is then captured by a sample-and-
hold circuit and further processed using low-offset bipolar
circuitry. This technique produces devices that have an
extremely stable quiescent Hall output voltage, are immune to
thermal stress, and have precise recoverability after temperature
cycling. This technique will also slightly degrade the device
output repeatability. A relatively high sampling frequency is
used in order that faster signals can be processed.
X
B
+V
Dwg. EH-012
—
HALL
VOLTAGE
+
Dwg. AH-011-2
More detailed descriptions of the circuit operation can be
found in: Technical Paper STP 97-10, Monolithic Magnetic
Hall Sensor Using Dynamic Quadrature Offset Cancellation
and Technical Paper STP 99-1, Chopper-Stabilized Amplifiers
With A Track-and-Hold Signal Demodulator.
+V
V
CC
Operation. The output of these devices switches low (turns
on) when a magnetic field (south pole) perpendicular to the Hall
sensor exceeds the operate point threshold (BOP). After turn-on,
the output is capable of sinking 25 mA and the output voltage is
VOUT(SAT). When the magnetic field is reduced below the
release point (BRP), the device output goes high (turns off). The
difference in the magnetic operate and release points is the
hysteresis (Bhys) of the device. This built-in hysteresis allows
clean switching of the output even in the presence of external
mechanical vibration and electrical noise.
B
B
OP
RP
V
OUT(SAT)
0
Applications. It is strongly recommended that an external
bypass capacitor be connected (in close proximity to the Hall
sensor) between the supply and ground of the device to reduce
both external noise and noise generated by the chopper-
stabilization technique.
0
+B
FLUX DENSITY
Dwg. GH-007-2
SUPPLY
The simplest form of magnet that will operate these devices
is a ring magnet. Other methods of operation, such as linear
magnets, are possible. Extensive applications information on
magnets and Hall-effect sensors is also available in Application
Note 27701, or at
OUTPUT
www.allegromicro.com
0.1 µF
X
SUPPLY
Dwg. EH-013
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7
3240
CHOPPER-STABILIZED,
PRECISION
HALL-EFFECT SWITCH
PACKAGE DESIGNATOR ‘LH’
(fits SC-59A solder-pad layout)
Dimensions in Inches
(for reference only)
Dimensions in Millimeters
(controlling dimensions)
0.122
0.114
3.10
2.90
0.020
0.012
0.50
0.30
3
3
0.083
0.073
0.118
0.106
2.10
1.85
3.00
2.70
0.010
0.25
1
2
1
2
BSC
BSC
GAUGE PLANE
SEATING PLANE
GAUGE PLANE
SEATING PLANE
0.022
0.55
REF
REF
0.010
MIN
0.25
MIN
0° TO 8°
0° TO 8°
0.95
BSC
0.037
BSC
0.0079
0.0050
0.20
0.006
0.000
0.15
0.00
0.127
0.045
0.032
1.13
0.87
Dwg. MA-010-3D in
Dwg. MA-010-3D mm
0.028
0.70
3
3
0.039
1.00
0.094
2.40
1
2
1
2
0.037
0.95
Dwg. MA-011-3 in
Dwg. MA-011-3 mm
NOTES: 1. Tolerances on package height and width represent allowable mold offsets. Dimensions given are
measured at the widest point (parting line).
2. Exact body and lead configuration at vendor’s option within limits shown.
3. Height does not include mold gate flash.
4. Where no tolerance is specified, dimension is nominal.
5. Add "LT" to part number for tape and reel.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
8
3240
CHOPPER-STABILIZED,
PRECISION
HALL-EFFECT SWITCH
PACKAGE DESIGNATOR ‘LT’
(SOT89/TO-243AA)
Dimensions in Inches
(for reference only)
Dimensions in Millimeters
(controlling dimensions)
0.181
4.60
1.60
0.063
0.055
0.173
4.40
1.40
0.0173
0.0138
0.44
0.35
0.072
0.064
1.83
1.62
2.60
2.29
2.29
2.13
0.102
0.090
0.090
0.084
0.167
0.155
4.25
3.94
2
3
2
3
1
1
0.48
0.36
0.0189
0.0142
0.0221
0.0173
1.20
0.89
0.047
0.035
0.56
0.44
1.50
0.059
BSC
BSC
3.00
0.118
BSC
BSC
Dwg. MA-009-3A mm
Dwg. MA-009-3A in
2.5
2.0
0.098
0.079
B
0.8
B
0.031
2.6
0.102
0.181
A
A
2
4.6
1.2
0.8
0.047
3
1
2
3
1
0.7
TYP
0.028
TYP
0.031
TYP
TYP
Pads 1, 2, 3, and A — Standard SOT89 Layout
Pads 1, 2, 3, and B — Low-Stress Version
Pads 1, 2, and 3 only — Lowest Stress, But Not Self Aligning
Pads 1, 2, 3, and A — Standard SOT89 Layout
Pads 1, 2, 3, and B — Low-Stress Version
Pads 1, 2, and 3 only — Lowest Stress, But Not Self Aligning
Dwg. MA-012-3 mm
Dwg. MA-012-3 in
NOTES: 1. Exact body and lead configuration at vendor’s option within limits shown.
2. Supplied in bulk pack (500 pieces per bag) or add "TR" to part number for tape and reel.
3. Only low-temperature (≤240°C) reflow-soldering techniques are recommended for SOT89 devices.
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9
3240
CHOPPER-STABILIZED,
PRECISION
HALL-EFFECT SWITCH
PACKAGE DESIGNATOR ‘UA’
Dimensions in Millimeters
Dimensions in Inches
(controlling dimensions)
(for reference only)
0.164
0.159
4.17
4.04
0.062
0.058
1.57
1.47
45°
45°
0.122
0.117
3.10
2.97
45°
45°
0.79
0.031
0.085
MAX
2.16
MAX
1
2
3
1
2
3
16.26
15.24
0.44
0.35
0.640
0.600
0.0173
0.0138
0.48
0.36
0.0189
0.0142
SEE NOTE
SEE NOTE
1.27
BSC
0.050
BSC
Dwg. MH-014E mm
Dwg. MH-014E in
Radial Lead Form (order A3240xUA-LC)
NOTES: 1. Tolerances on package height and width represent
allowable mold offsets. Dimensions given are
measured at the widest point (parting line).
2. Exact body and lead configuration at vendor’s option
within limits shown.
3. Height does not include mold gate flash.
4. Recommended minimum PWB hole diameter to clear
transition area is 0.035" (0.89 mm).
5. Where no tolerance is specified, dimension is nominal.
6. Supplied in bulk pack (500 pieces per bag).
1
2
3
0.108"
(2.74 mm)
0.620"
0.500"
(15.7 mm
12.7 mm)
0.100"
(2.5 mm)
Dwg. MH-026
NOTE: Lead-form dimensions are the nominals produced on the
forming equipment. No dimensional tolerance is implied or
guaranteed for bulk packaging (500 pieces per bag).
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
10
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