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

APPLICATION INFORMATION

Impact of External Magnetic Fields

The ACS722 works by sensing the magnetic field created by the

current flowing through the package. However, the sensor cannot

differentiate between fields created by the current flow and exter-

nal magnetic fields. This means that external magnetic fields can

cause errors in the output of the sensor. Magnetic fields which are

perpendicular to the surface of the package affect the output of

the sensor, as it only senses fields in that one plane. The error in

Amperes can be quantified as:

B

Error(B) =

CF

where B is the strength of the external field perpendicular to the

surface of the package in Gauss, and CF is the coupling factor in

G/A. Then, multiplying by the sensitivity of the part, Sens, gives

the error in mV.

For example, an external field of 1 Gauss will result in around

0.1 A of error. If the ACS722LLCTR-10AB, which has a nominal

sensitivity of 132 mV/A, is being used, that equates to 13.2 mV

of error on the output of the sensor.

External Field

(Gauss)

0.5

1

2

Error (A)

0.05

0.1

0.2

5AB

13.2

26.4

52.8

Error (mV)

10AB 20AB

6.6

3.3

13.2 6.6

26.4 13.2

40AB

1.65

3.3

6.6

Allegro MicroSystems, LLC

19

115 Northeast Cutoff

Worcester, Massachusetts 01615-0036 U.S.A.

1.508.853.5000; www.allegromicro.com

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