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부품번호 | A3046 기능 |
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기능 | HALL EFFECT GEAR-TOOTH SENSORS ZERO SPEED | ||
제조업체 | Allegro MicroSystems | ||
로고 | |||
전체 8 페이지수
3046, 3056, AND
3058
HALL EFFECT GEAR-TOOTH SENSORS
–ZERO SPEED
XX
V
CC
12
3
Dwg. PH-012
Pinning is shown viewed from branded side.
ABSOLUTE MAXIMUM RATINGS
Supply Voltage, VCC . . . . . . . . . . . . . . 28 V
Reverse Battery Voltage,
VRCC . . . . . . . . . . . . . . . . . . . . . . -30 V
Magnetic Flux Density, B . . . . . Unlimited
Output OFF Voltage, VOUT . . . . . . . . . 28 V
Reverse Output Voltage, VOUT . . . . . -0.5 V
Output Current, IOUT . . . . . . . . . . . . 25 mA
Package Power Dissipation, PD . . 500 mW
Operating Temperature Range, TA
Suffix “EU” . . . . . . . . . -40°C to +85°C
Suffix “LU” . . . . . . . . -40°C to +150°C
Storage Temperature Range,
TS . . . . . . . . . . . . . . . -65°C to +170°C
The A3046EU/LU, A3056EU/LU, and A3058EU/LU Hall effect
gear-tooth sensors are monolithic integrated circuits that switch in
response to differential magnetic fields created by ferrous targets.
These devices are ideal for use in gear-tooth-based speed, position,
and timing applications and operate down to zero rpm over a wide
range of air gaps and temperatures. When combined with a back-
biasing magnet and proper assembly techniques, devices can be
configured to give 50% duty cycle or to switch on either leading,
trailing, or both edges of a passing gear tooth or slot.
The six devices differ only in their magnetic switching values and
operating temperature ranges. The low hysteresis of the A3046/56EU
and A3046/56LU makes them perfectly suited for ABS (anti-lock brake
system) or speed sensing applications where maintaining large air
gaps is important. The A3046EU/LU features improved switch point
stability with temperature over the A3056EU/LU. The high hysteresis
of the A3058EU and A3058LU, with their excellent temperature
stability, makes them especially suited to ignition timing applications
where switch-point accuracy (and latching requirements) is extremely
important.
Continued next page...
BENEFITS
I Senses Ferrous Targets Down to Zero RPM
I Large Effective Air Gap
I Wide Operating Temperature Range
I Operation from Unregulated Supply
I High-Speed Operation
I Output Compatible With All Logic Families
I Reverse Battery Protection
I Solid-State Reliability
I Resistant to Physical Stress
SELECTION GUIDE
Operating Temp. Range
-40°C to +85°C
-40°C to +150°C
Switching Hysteresis
15-90 G
150-250 G
Device Type Number
A3046EU
A3056EU
A3058EU
A3046LU
A3056LU
A3058LU
3046, 3056, AND 3058
HALL EFFECT
GEAR-TOOTH SENSORS
–ZERO SPEED
Figure 1
TYPICAL GEAR-TOOTH SENSING
APPLICATION
BACK-BIASING
MAGNET
S
OPTIONAL POLE PIECE
SENSOR IC
A
NS
TARGET
GEAR
APPLICATIONS INFORMATION
A gear-tooth sensing system consists of the sensor IC, a back-
biasing magnet, an optional pole piece, and a target (Figure 1). The
system requirements are usually specified in terms of the effective
working air gap between the package and the target (gear teeth), the
number of switching events per rotation of the target, temperature and
speed ranges, minimum pulse duration or duty cycle, and switch point
accuracy. Careful choice of the sensor IC, magnet material and
shape, target material and shape, and assembly techniques enables
large working air gaps and high switch-point accuracy over the system
operating temperature range.
Naming Conventions. With a south pole in front of the branded
surface of the sensor, a north pole behind the sensor, the field at the
sensor is defined as positive. As used here, negative flux densities are
defined as less than zero (algebraic convention), e.g., -100 G is less
than -50 G.
Magnet Biasing. In order to sense moving non-magnetized
ferrous targets, these devices must be back-biased by mounting the
unbranded side on a small permanent magnet. Either magnetic pole
(north or south) can be used.
The devices can also be used without a back-biasing magnet.
In this configuration, the sensor can be used to detect a rotating ring
magnet such as those found in brushless dc motors or in speed
sensing applications. Here, the sensor detects the magnetic field
gradient created by the magnetic poles.
Figure 2
TYPICAL TRANSFER CHARACTERISTIC
Dwg. AH-003
24 V
MAX
B OP
0
-B
B RP
V OUT(SAT)
0
DIFFERENTIAL FLUX DENSITY, BE1 – BE2
+B
Dwg. GH-034
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
4페이지 3046, 3056, AND 3058
HALL EFFECT
GEAR-TOOTH SENSORS
–ZERO SPEED
Figure 5
DIFFERENTIAL FLUX DENSITY
2000
1500
1000
500
0
-500
-1000
-1500
-2000
0
200
0.025
0.050
0.075
0.100
AIRGAP FROM PACKAGE FACE IN INCHES
0.125
Dwg. GH-035
150
100
50
0
-50
-100
-150
-200
0.070
0.080
0.090
0.100
0.110
AIRGAP FROM PACKAGE FACE IN INCHES
0.120
Dwg. GH-036
SENSOR LOCATIONS
(±0.005” [0.13 mm] die placement)
ACTIVE AREA DEPTH
0.015"
0.38 mm
NOM
0.088"
2.23 mm
Pole Piece Design. A pole piece may be used at the face of the
magnet to smooth out the magnet-face offsets. A 0.020” (0.51 mm)
thick, soft-iron pole piece will bring the field non-uniformity down to
the ±1%-to-±3% range. Note that pole pieces will minimize but not
eliminate the non-uniformity in the magnet face field. Front pole pieces
will almost always result in a reduced maximum air gap.
Ferrous Targets. The best ferrous targets are made of cold-rolled
low-carbon steel. Sintered-metal targets are also usable, but care
must be taken to ensure uniform material composition and density.
The teeth or slots of the target should be cut with a slight angle
so as to minimize the abruptness of transition from metal to air as the
target passes by the sensor. Sharp transitions will result in magnetic
overshoots that can result in false triggering.
Gear teeth larger than 0.10” (2.54 mm) wide and at least 0.10”
(2.54 mm) deep provide reasonable working air gaps and adequate
change in magnetic field for reliable switching. Generally, larger teeth
and slots allow a larger air gap. A gear tooth width approximating the
spacing between sensors (0.088” or 2.24 mm) requires special care in
the system design and assembly techniques.
ASSEMBLY TECHNIQUES
Due to magnet face non-uniformities and device variations, it is
recommended that applications requiring precision switching utilize a
mechanical optimization procedure during assembly. Without a pole
piece, the inherent magnet face offsets can be used to pre-bias the
magnetic circuit to obtain any desired operating mode. This is
achieved by physically changing the relative position of the magnet
behind the sensor to achieve the desired system performance objec-
tive. For example, with a rotating ABS gear, the objective might be a
50% duty cycle at maximum air gap. Similar objectives can be set for
ignition (crank and cam position) sensing systems.
Non-precision speed sensing applications do not require optimiza-
tion. For applications where mechanical optimization is not feasible,
non-zero speed devices such as the UGN/UGS3059KA ac-coupled
gear-tooth sensor are available.
0.075"
E1 1.89 mm
E2
A
BRANDED
SURFACE
1
2
3
Dwg. MH-002-8D
www.allegromicro.com
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부품번호 | 상세설명 및 기능 | 제조사 |
A3046 | HALL EFFECT GEAR-TOOTH SENSORS ZERO SPEED | Allegro MicroSystems |
A3046EU | HALL EFFECT GEAR-TOOTH SENSORS ZERO SPEED | Allegro MicroSystems |
DataSheet.kr | 2020 | 연락처 | 링크모음 | 검색 | 사이트맵 |