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| 型号： | ACS714LLCTR-20A-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 15/18页 |
| 文件大小： | 0K |
| 描述： | SENSOR CURRENT 20A 5V BI 8-SOIC |
| 特色产品： | ACS714 - Automotive Grade, High Accuracy Hall-Effect Current Sensor |
| 标准包装： | 1 |
| 电流 - 感应： | ±20A |
| 精确度： | ±1.5% |
| 灵敏度： | 100mV/A |
| 电流 - 电源： | 10mA |
| 传感器类型： | 霍尔效应 |
| 电源电压： | 4.5 V ~ 5.5 V |
| 输出： | 2.5V |
| 频率： | 80kHz |
| 响应时间： | 5µs |
| 电极标记： | 双向 |
| 工作温度： | -40°C ~ 150°C |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 包装： | 标准包装 |
| 产品目录页面： | 1140 (CN2011-ZH PDF) |
| 其它名称： | 620-1226-6 |
ACS714
Chopper Stabilization Technique
Automotive Grade, Fully Integrated, Hall Effect-Based Linear Current Sensor IC
with 2.1 kVRMS Voltage Isolation and a Low-Resistance Current Conductor
Chopper Stabilization is an innovative circuit technique that is
used to minimize the offset voltage of a Hall element and an asso-
ciated on-chip amplifier. Allegro patented a Chopper Stabiliza-
tion technique that nearly eliminates Hall IC output drift induced
by temperature or package stress effects. This offset reduction
technique is based on a signal modulation-demodulation process.
Modulation is used to separate the undesired DC offset signal
from the magnetically induced signal in the frequency domain.
This technique is made possible through the use of a BiCMOS
process that allows the use of low-offset and low-noise amplifiers
in combination with high-density logic integration and sample
and hold circuits.
Regulator
Clock/Logic
Then, using a low-pass filter, the modulated DC offset is sup-
pressed while the magnetically induced signal passes through
the filter. As a result of this chopper stabilization approach, the
Hall Element
Amp
Low-Pass
Filter
output voltage from the Hall IC is desensitized to the effects
of temperature and mechanical stress. This technique produces
devices that have an extremely stable Electrical Offset Voltage,
are immune to thermal stress, and have precise recoverability
after temperature cycling.
Concept of Chopper Stabilization Technique
Typical Applications
+5 V
V PEAK
+5 V
C BYP
0.1 μF
C2
0.1 μF
V RESET
C BYP
0.1 μF
R1
100 kΩ
IP+
R3
330 kΩ
IP+
I P
1
2
3
4
VCC
IP+ VIOUT
ACS714
IP– FILTER
IP–
GND
8
7
6
5
R F
10 kΩ
C OUT
0.1 μF
V OUT
R1
1 MΩ
C F
1 nF
R2
33 kΩ
R4
10 kΩ
U1 D1
LT1178 1N914
C1
0.1 μF
Q1
2N7002
I P
1
2
3
4
VCC
IP+ VIOUT
ACS714
IP– FILTER
IP–
GND
8
7
6
5
R2
100 kΩ
R F
1 kΩ
C F
0.01 μF
1
3
LM321
5
4
2
R3
3.3 kΩ
V OUT
C1
1000 pF
Application 3. This configuration increases gain to 610 mV/A
(tested using the ACS714ELC-05A).
Application 2. Peak Detecting Circuit
+5 V
+5 V
C BYP
C BYP
0.1 μF
R1
33 kΩ
IP+ VIOUT
IP– FILTER
IP–
R1
IP+
I P
0.1 μF
1 VCC
IP+
2
ACS714
3
4
GND
8
7
6
5
V OUT
R F
2 kΩ
10 kΩ
C F
1 nF
D1
1N4448W
C1
A-to-D
Converter
I P
1
2
3
4
VCC
IP+ VIOUT
ACS714
IP– FILTER
IP–
GND
8
7
6
5
R2
100 kΩ
V OUT
C F
1 nF
4
3
–
+
R PU
100 kΩ
5
1 Fault
2 U1
LMV7235
D1
1N914
Application 4. Rectified Output. 3.3 V scaling and rectification application
for A-to-D converters. Replaces current transformer solutions with simpler
ACS circuit. C1 is a function of the load resistance and filtering desired.
R1 can be omitted if the full range is desired.
Application 5. 10 A Overcurrent Fault Latch. Fault threshold set by R1 and
R2. This circuit latches an overcurrent fault and holds it until the 5 V rail is
powered down.
Allegro MicroSystems, LLC
115 Northeast Cutoff, Box 15036
15
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
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相关代理商/技术参数 |
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|---|---|
| ACS714LLCTR-30A-T | 功能描述:SENSOR CURRENT 30A 5V BI 8-SOIC RoHS:是 类别:传感器，转换器 >> 电流 系列:- 标准包装:10 系列:* |
| ACS714LLCTR-50A-T | 功能描述:SENSOR CURRENT 50A 5V BI 8SOIC RoHS:是 类别:传感器，转换器 >> 电流 系列:- 标准包装:10 系列:* |
| ACS715 | 制造商:ALLEGRO 制造商全称:Allegro MicroSystems 功能描述:Automotive Grade, Fully Integrated, Hall Effect-Based Linear Current Sensor with 2.1 kVRMS Voltage Isolation and a Low-Resistance Current Conductor |
| ACS715ELCTR-20A-T | 功能描述:SENSOR CURRENT 20A 5V UNI 8-SOIC RoHS:是 类别:传感器，转换器 >> 电流 系列:- 标准包装:10 系列:* |
| ACS715ELCTR-30A-T | 功能描述:SENSOR CURRENT 30A 5V UNI 8-SOIC RoHS:是 类别:传感器，转换器 >> 电流 系列:- 标准包装:10 系列:* |
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