ACS722 查看數據表（PDF） - Allegro MicroSystems

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ACS722

High Accuracy, Galvanically Isolated Current Sensor IC With Small Footprint SOIC8 Package

Allegro MicroSystems 

ACS722

High Accuracy, Galvanically Isolated Current Sensor IC

With Small Footprint SOIC8 Package

FEATURES AND BENEFITS

• Patented integrated digital temperature compensation

circuitry allows for near closed loop accuracy over

temperature in an open loop sensor

• UL60950-1 (ed. 2) certified

□□Dielectric Strength Voltage = 2.4 kVrms

□□Basic Isolation Working Voltage = 420 Vpk/297

Vrms

• Industry-leading noise performance with greatly

improved bandwidth through proprietary amplifier and

filter design techniques

• Pin-selectable band width: 80 kHz for high bandwidth

applications or 20 kHz for low noise performance

• 0.65 mΩ primary conductor resistance for low power

loss and high inrush current withstand capability

• Small footprint, low-profile SOIC8 package suitable for

space-constrained applications

• Integrated shield virtually eliminates capacitive coupling

from current conductor to die, greatly suppressing output

noise due to high dv/dt transients

• 3 to 3.6 V, single supply operation

Continued on the next page…

Package: 8-pin SOIC (suff ix LC)

CB Certif icate Number:

US-22334-A1-UL

Approximate Scale 1:1

DESCRIPTION

The Allegro™ ACS722 current sensor IC is an economical and

precise solution for AC or DC current sensing in industrial,

commercial, and communications systems. The small package

is ideal for space constrained applications while also saving

costs due to reduced board area. 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 field to the Hall transducer. A precise, proportional

voltage is provided by the low-offset, chopper-stabilized

BiCMOS Hall IC, which includes Allegro’s patented digital

temperature compensation, resulting in extremely accurate

performance over temperature. The output of the device has

a positive slope 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 0.65 mΩ typical, providing

low power loss.

The terminals of the conductive path are electrically isolated

from the sensor leads (pins 5 through 8). This allows the

ACS722 current sensor IC to be used in high-side current sense

applications without the use of high-side differential amplifiers

or other costly isolation techniques.

The ACS722 is provided in a small, low profile surface mount

SOIC8 package. The leadframe is plated with 100% matte tin,

Continued on the next page…

ACS722-DS, Rev. 2

1

IP+

8

VCC

+I P

ACS722

2 IP+

7

VIOUT

IP

3

IP–

6

BW_SEL

–IP

CL

4

IP–

GND 5

Typical Application

CBYPASS

0.1 µF

The ACS722 outputs an analog

signal, VIOUT , that changes,

proportionally, with the

bidirectional AC or DC primary

sensed current, IP , within

the specified measurement

range. The BW_SEL pin can

be used to select one of the

two bandwidths to optimize the

noise performance. Grounding

the BW_SEL pin puts the part

in the high bandwidth (80 kHz)

mode.

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