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ACS712 Schematic ( PDF Datasheet ) - Allegro MicroSystems

Teilenummer ACS712
Beschreibung Fully Integrated / Hall Effect-Based Linear Current Sensor
Hersteller Allegro MicroSystems
Logo Allegro MicroSystems Logo 




Gesamt 15 Seiten
ACS712 Datasheet, Funktion
ACS712
Fully Integrated, Hall Effect-Based Linear Current Sensor IC
with 2.1 kVRMS Isolation and a Low-Resistance Current Conductor
Features and Benefits
Low-noise analog signal path
Device bandwidth is set via the new FILTER pin
5 μs output rise time in response to step input current
80 kHz bandwidth
Total output error 1.5% at TA= 25°C
Small footprint, low-profile SOIC8 package
1.2 mΩ internal conductor resistance
2.1 kVRMS minimum isolation voltage from pins 1-4 to pins 5-8
5.0 V, single supply operation
66 to 185 mV/A output sensitivity
Output voltage proportional to AC or DC currents
Factory-trimmed for accuracy
Extremely stable output offset voltage
Nearly zero magnetic hysteresis
Ratiometric output from supply voltage
TÜV America
Certificate Number:
U8V 06 05 54214 010
Package: 8 Lead SOIC (suffix LC)
Description
The AllegroACS712 provides economical and precise
solutionsforACorDCcurrentsensinginindustrial, commercial,
and communications systems. The device package allows for
easy implementation by the customer. Typical applications
include motor control, load detection and management, switch-
mode power supplies, and overcurrent fault protection. The
device is not intended for automotive applications.
The device consists of a precise, low-offset, linear Hall circuit
with a copper conduction path located near the surface of the
die. Applied current flowing through this copper conduction
path generates a magnetic field which the Hall IC converts into a
proportional voltage. Device accuracy is optimized through the
close proximity of the magnetic signal to the Hall transducer.
A precise, proportional voltage is provided by the low-offset,
chopper-stabilized BiCMOS Hall IC, which is programmed
for accuracy after packaging.
The output of the device has a positive slope (>VIOUT(Q))
when an increasing current flows through the primary copper
conduction path (from pins 1 and 2, to pins 3 and 4), which is
the path used for current sampling. The internal resistance of
this conductive path is 1.2 mΩ typical, providing low power
loss. The thickness of the copper conductor allows survival of
Continued on the next page…
Approximate Scale 1:1
ACS712-DS, Rev. 15
Typical Application
1 IP+
8
VCC
2 IP+
7
VIOUT
IP ACS712
3 IP– FILTER 6
4 IP– GND 5
+5 V
VOUT
CBYP
0.1 μF
CF
1 nF
Application 1. The ACS712 outputs an analog signal, VOUT.
that varies linearly with the uni- or bi-directional AC or DC
primary sampled current, IP, within the range specified. CF
is recommended for noise management, with values that
depend on the application.






ACS712 Datasheet, Funktion
ACS712
Fully Integrated, Hall Effect-Based Linear Current Sensor IC
with 2.1 kVRMS Isolation and a Low-Resistance Current Conductor
Characteristic Performance
IP = 5 A, unless otherwise specified
Mean Supply Current versus Ambient Temperature
10.30
10.25
10.20
10.15
10.10
10.05
10.00
VCC = 5 V
9.95
9.90
9.85
9.80
9.75
-50 -25 0 25 50 75 100 125 150
TA (°C)
Magnetic Offset versus Ambient Temperature
0
–0.5
–1.0
–1.5
–2.0
–2.5
–3.0
VCC = 5 V; IP = 0 A,
After excursion to 20 A
–3.5
–4.0
–4.5
–5.0
-50 -25 0 25 50 75 100 125 150
TA (°C)
Mean Total Output Error versus Ambient Temperature
8
6
4
2
0
–2
–4
–6
–8
–50 –25
0
25 50 75 100 125 150
TA (°C)
Output Voltage versus Sensed Current
4.0
3.5
3.0 VCC = 5 V
2.5
2.0 TA (°C)
–40
1.5 25
1.0
85
150
0.5
0
–7 –6 –5 –4 –3 –2 –1 0 1 2 3 4 5 6 7
IP (A)
0 A Output Voltage versus Ambient Temperature
2520
Supply Current versus Supply Voltage
10.9
10.8
10.7
10.6
10.5
10.4
10.3
10.2
10.1
10.0
4.5 4.6 4.7 4.8 4.9 5.0 5.1 5.2 5.3 5.4 5.5
VCC (V)
Nonlinearity versus Ambient Temperature
0.6
0.5
0.4 VCC = 5 V
0.3
0.2
0.1
0
–50 –25
0
25 50 75 100 125 150
TA (°C)
Sensitivity versus Ambient Temperature
186.5
186.0
185.5
185.0
184.5
184.0
183.5
183.0
182.5
182.0
181.5
181.0
–50
–25
0
25 50 75 100 125 150
TA (°C)
Sensitivity versus Sensed Current
200.00
190.00
180.00
170.00
160.00
150.00
140.00
130.00
120.00
TA (°C)
–40
25
85
150
110.00
100.00
-6 -4 -2 0 2 4 6
Ip (A)
0 A Output Voltage Current versus Ambient Temperature
0.20
2515
0.15
2510
IP = 0 A
0.10
IP = 0 A
2505
0.05
2500
0
2495
–0.05
2490
–0.10
2485
-50 -25
0
25 50 75
TA (°C)
100 125 150
–0.15
-50 -25 0 25 50 75 100 125 150
TA (°C)
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
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ACS712 pdf, datenblatt
ACS712
Fully Integrated, Hall Effect-Based Linear Current Sensor IC
with 2.1 kVRMS Isolation and a Low-Resistance Current Conductor
Typical Applications
+5 V
CBYP
0.1 μF
1 IP+
8
VCC
2 IP+
7
VIOUT
COUT
0.1 μF
VOUT
RF
IP
3
4
ACS712
IP– FILTER
IP–
6
5
10 kΩ
R1
1 MΩ
CF
1 nF
GND
R2
33 kΩ
C2
0.1 μF
R4
10 kΩ
+
U1 D1
LT1178 1N914
R3
330 kΩ
C1
0.1 μF
VPEAK
VRESET
Q1
2N7002
Application 2. Peak Detecting Circuit
+5 V
CBYP
0.1 μF
1 IP+
8
VCC
2 IP+
7
VIOUT
VOUT
D1
1N4448W
RF
IP
ACS712
2 kΩ R1
3 IP– FILTER 6
4 IP–
5
10 kΩ
CF
1 nF
GND
C1
A-to-D
Converter
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.
+5 V
CBYP
0.1 μF
R1
100 kΩ
R2
100 kΩ
1 IP+
8
VCC
2 IP+
7
VIOUT
IP ACS712
RF
1 kΩ
3 IP– FILTER 6
4 IP– GND 5
CF
0.01 μF
1+
LM321
5
4
3
2
R3
3.3 kΩ
VOUT
C1
1000 pF
Application 3. This configuration increases gain to 610 mV/A
(tested using the ACS712ELC-05A).
+5 V
CBYP
0.1 μF
R1
33 kΩ
1 IP+
8
VCC
2 IP+
7
VIOUT
IP ACS712
3 IP– FILTER 6
4 IP– GND 5
R2
100 kΩ
VOUT
CF
1 nF
RPU
100 kΩ
4
5
1
Fault
3 + 2 U1
LMV7235
D1
1N914
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
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
12

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