ACS714ELCTR-05B-T Allegro Microsystems Inc, ACS714ELCTR-05B-T Datasheet - Page 13

• Manufacturer Part Number: ACS714ELCTR-05B-T
• Description: IC, LINEAR CURRENT SENSOR, 10mA, 8-SOIC
• Manufacturer: Allegro Microsystems Inc
• Series: -r

Specifications of ACS714ELCTR-05B-T

• Quiescent Current: 10mA
• Bandwidth: 80kHz
• Sensor Case Style: SOIC
• No. Of Pins: 8
• Supply Voltage Range: 4.5V To 5.5V
• Operating Temperature Range: -40°C To +85°C
• Polarization: Bipolar
• Current - Sensing: ±5A
• Accuracy: ±1.5%
• Sensitivity: 180 ~ 190 mV/A
• Current - Supply: 10mA
• Sensor Type: Hall Effect
• Voltage - Supply: 4.5 V ~ 5.5 V
• Output: 2.5V
• Frequency: 80kHz
• Response Time: 5µs
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 8-SOIC (0.154", 3.90mm Width)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

ACS714
Chopper Stabilization Technique
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.
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
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.
Typical Applications
Application 2. Peak Detecting Circuit
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.
I
P
C
0.1 μF
1
2
3
4
BYP
IP+
IP+
IP–
IP–
ACS714
I
P
+5 V
FILTER
VIOUT
C
0.1 μF
1
2
3
4
GND
VCC
BYP
IP+
IP+
IP–
IP–
ACS714
8
7
6
5
+5 V
FILTER
VIOUT
10 kΩ
R
GND
VCC
F
8
7
6
5
C
1 nF
1 MΩ
C
0.1 μF
R1
F
OUT
R
2 kΩ
33 kΩ
R2
F
V
V
OUT
C
1 nF
OUT
F
10 kΩ
R1
+
–
330 kΩ
R3
1N4448W
D1
U1
LT1178
C2
0.1 μF
10 kΩ
R4
C1
Automotive Grade, Fully Integrated, Hall Effect-Based Linear Current Sensor IC
C1
0.1 μF
D1
1N914
with 2.1 kVRMS Voltage Isolation and a Low-Resistance Current Conductor
A-to-D
Converter
Q1
2N7002
V
V
PEAK
RESET
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.
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.
Application 3. This configuration increases gain to 610 mV/A
(tested using the ACS714ELC-05A).
Hall Element
I
P
C
0.1 μF
1
2
3
4
BYP
IP+
IP+
IP–
IP–
I
ACS714
P
+5 V
FILTER
C
0.1 μF
VIOUT
1
2
3
4
BYP
Regulator
VCC
GND
Concept of Chopper Stabilization Technique
IP+
IP+
IP–
IP–
ACS714
+5 V
FILTER
8
7
6
5
VIOUT
VCC
GND
100 kΩ
R1
100 kΩ
R2
C
0.01 μF
8
7
6
5
F
R
1 kΩ
F
100 kΩ
R1
33 kΩ
R2
115 Northeast Cutoff, Box 15036
Allegro MicroSystems, Inc.
Worcester, Massachusetts 01615-0036 [phone]
www.allegromicro.com
V
C
1 nF
OUT
F
1
3
+
–
Clock/Logic
5
4
2
3
Amp
3.3 kΩ
LM321
R3
+
–
4
5
2
D1
1N914
U1
LMV7235
1
V
C1
1000 pF
OUT
100 kΩ
R
PU
Fault
Low-Pass
Filter
13