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參數(shù)資料
| 型號： | A3242LLHLT-T |
| 廠商： | Allegro MicroSystems, Inc. |
| 英文描述： | Chopper-Stabilized Unipolar Hall-Effect Switches |
| 中文描述： | 斬波穩(wěn)定單極霍爾效應開關 |
| 文件頁數(shù)： | 8/12頁 |
| 文件大?。?/td> | 401K |
| 代理商： | A3242LLHLT-T |
8
A3241-DS, Rev. 2
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
115 Northeast Cutoff, Box 15036
Allegro MicroSystems, Inc.
Chopper-Stabilized Unipolar Hall Effect Switches
A3241 and A3242
Functional Description
B
O
B
R
B
HYS
V
CC
V
C
V
OUT(SAT)
S
S
B+
B–
V+
0
0
VCC
V
S
Sensor Output
GND
VOUT
R
LOAD
A324x
0.1 μF
C
BYP
Operation
The output of these devices switches low (turns on) when a
magnetic
fi
eld (south polarity) perpendicular to the Hall sen-
sor exceeds the operate point threshold, B
OP
. After turn-on, the
output voltage is V
OUT(SAT)
. The output transistor is capable of
sinking current up to the short circuit current limit, I
OM
, which
is a minimum of 30 mA. When the magnetic
fi
eld is reduced
below the release point, B
RP
, the device output goes high (turns
off). The difference in the magnetic operate and release points is
the hysteresis, B
hys
, of the device. This built-in hysteresis allows
clean switching of the output even in the presence of external
mechanical vibration and electrical noise.
Powering-on the device in the hysteresis region, less than B
OP
and higher than B
RP
, allows an indeterminate output state. The
correct state is attained after the
fi
rst excursion beyond B
OP
or
B
RP
.
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. As is
shown in Panel B of
fi
gure 1, a 0.1
μ
F capacitor is typical.
Extensive applications information on magnets and Hall-effect
sensors is available in:
Hall-Effect IC Applications Guide
, AN27701,
Hall-Effect Devices: Gluing, Potting, Encapsulating, Lead
Welding and Lead Forming
, AN27703.1
Soldering Methods for Allegro’s Products – SMT and Through-
Hole
, AN26009
All are provided in
Allegro Electronic Data Book
, AMS-702 and
the Allegro Web site: www.allegromicro.com
Figure 1: Switching Behavior of Unipolar Switches.
In Panel A,
on the horizontal axis, the B+ direction indicates increasing south polarity
magnetic
fi
eld strength, and the B– direction indicates decreasing south polarity
fi
eld strength (including the case of increasing north
polarity). This behavior can be exhibited when using a circuit such as that shown in panel B.
(A)
(B)
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| A3242LUA | Chopper-Stabilized Unipolar Hall-Effect Switches |
| A3242LUA-T | Chopper-Stabilized Unipolar Hall-Effect Switches |
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| A3242LUA | 制造商:ALLEGRO 制造商全稱:Allegro MicroSystems 功能描述:Chopper-Stabilized Unipolar Hall-Effect Switches |
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| A3245 | 制造商:ALLEGRO 制造商全稱:Allegro MicroSystems 功能描述:Chopper-Stabilized Omnipolar Hall-Effect Switches |
| A3245_06 | 制造商:ALLEGRO 制造商全稱:Allegro MicroSystems 功能描述:Chopper-Stabilized Omnipolar Hall-Effect Switches |
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