1.Low-noise analog signal path 2.Device bandwidth is
set via the new FILTER pin 3.5 µs output rise time in
response to step input current
4.50 kHz bandwidth 5.Total output error 1.5% at TA=
25°C, and 4% at –40°C to 85°C 6.Small footprint,
low-profile SOIC8 package
7.1.2 mΩ internal conductor resistance 8.2.1
kV RMS 9.minimum isolation voltage from pins 1-4
to pins 5-8 10.5.0 V, single supply operation
11.66 to 185 mV/A output sensitivity 12.Output
voltage proportional to AC or DC currents
13.Factory-trimmed for accuracy 14.Extremely stable
output offset voltage 15.Nearly zero magnetic
hysteresis 16.Ratiometric output from supply voltage
Description
The Allegro® ACS712 provides economical and
precise solutions for AC or DC current sensing in industrial,
automotive, 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
Application
1. The ACS712 outputs an analog signal, VOUT. that varies
linearly with the uni- or bi-directional AC or DC primary
sensed current, IP, within the range specified. CF is
recommended for noise management, with values that depend on
the application.
Number | Name | Description |
1 and 2 | IP+ | Terminals for current being sensed; fused internally |
3 and 4 | IP– | Terminals for current being sensed; fused internally |
5 | GND | Signal ground terminal |
| 6 | FILTER | Terminal for external capacitor that sets bandwidth |
| 7 | VIOUT | Analog output signal |
| 8 | VCC | Device power supply termina |
