ACS712
Fully Integrated, Hall Effect-Based Linear Current Sensor
with 2.1 kVRMS Voltage 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 T
A
= 25°C
Small footprint, low-profile SOIC8 package
1.2 mΩ internal conductor resistance
2.1 kV
RMS
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
Description
The Allegro
®
ACS712 provides economical and precise
solutions for AC or DC current sensing in industrial,
commercial, and communications systems. The device
package allows for easy implementation by the customer.
Typical applications include motor control, load detection and
management, switched-mode power supplies, and overcurrent
fault protection.
The device consists of a precise, low-offset, linear Hall
sensor 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 is sensed
by the integrated Hall IC and converted 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 (>V
IOUT(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 sensing. The internal resistance of
this conductive path is 1.2 mΩ typical, providing low power
Continued on the next page…
Package: 8 Lead SOIC (suffix LC)
Approximate Scale 1:1
Typical Application
+5 V
1
2
I
P
3
4
IP+
VCC
8
7
V
OUT
C
BYP
0.1 μF
IP+ VIOUT
ACS712
IP– FILTER
IP–
GND
6
5
C
F
1 nF
Application 1. The ACS712 outputs an analog signal, V
OUT
.
that varies linearly with the uni- or bi-directional AC or DC
primary sensed current, I
P
, within the range specified. C
F
is recommended for noise management, with values that
depend on the application.
ACS712-DS, Rev. 6
ALLEGRO [ ALLEGRO MICROSYSTEMS ]
