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參數(shù)資料
| 型號： | A3245 |
| 廠商： | Allegro MicroSystems, Inc. |
| 英文描述： | Chopper-Stabilized Omnipolar Hall-Effect Switches |
| 中文描述： | 斬波穩(wěn)定全極霍爾效應(yīng)開關(guān) |
| 文件頁數(shù)： | 8/12頁 |
| 文件大小： | 392K |
| 代理商： | A3245 |
8
A3245-DS, Rev. 1
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
115 Northeast Cutoff, Box 15036
Allegro MicroSystems, Inc.
Chopper-Stabilized Omnipolar Hall Effect Switches
A3245
Functional Description
B
O
B
O
B
R
B
R
B
HYS
B
HYS
V
S
V
O
V
OUT(SAT)
S
S
S
S
B+
B–
V+
0
0
VCC
V
S
Sensor Output
GND
VOUT
R
LOAD
A3245
0.1 μF
C
BYP
Operation
The output of this device switches low (turns on) when a mag-
netic
fi
eld perpendicular to the Hall sensor exceeds the operate
point, B
OPS
(or is less than B
OPN
). After turn-on, the output
voltage is V
OUT(SAT)
. The output transistor is capable of sink-
ing 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
RPS
(or increased above B
RPN
), the device
output switches 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 a hysteresis region, between B
OPX
and B
RPX
, allows an indeterminate output state. The correct state
is attained after the
fi
rst excursion beyond B
OPX
or B
RPX
.
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.
Omnipolar switches allow operation with either a north pole or
south pole magnet orientation, enhancing product manufactur-
ability with the device.
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 Omnipolar 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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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| A3245_06 | 制造商:ALLEGRO 制造商全稱:Allegro MicroSystems 功能描述:Chopper-Stabilized Omnipolar Hall-Effect Switches |
| A32450-0009 | 功能描述:重負(fù)荷電源連接器 A32 PLUG 50mm CONT 50MMPINCON RoHS:否 制造商:Hirose Connector 系列:PS2 產(chǎn)品類型:Connectors 位置/觸點(diǎn)數(shù)量: 端接類型:Crimp 觸點(diǎn)材料: 觸點(diǎn)電鍍:Gold 電壓額定值: 電流額定值:300 A 附件類型: |
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| A32450-0049 | 功能描述:重負(fù)荷電源連接器 A32 PLUG 50mm CONT WITH 2 AUX/2 PILOT RoHS:否 制造商:Hirose Connector 系列:PS2 產(chǎn)品類型:Connectors 位置/觸點(diǎn)數(shù)量: 端接類型:Crimp 觸點(diǎn)材料: 觸點(diǎn)電鍍:Gold 電壓額定值: 電流額定值:300 A 附件類型: |
| A32450-1009 | 功能描述:重負(fù)荷電源連接器 A32 PLUG 50mm CONT 50MMPINCON RoHS:否 制造商:Hirose Connector 系列:PS2 產(chǎn)品類型:Connectors 位置/觸點(diǎn)數(shù)量: 端接類型:Crimp 觸點(diǎn)材料: 觸點(diǎn)電鍍:Gold 電壓額定值: 電流額定值:300 A 附件類型: |
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