4

115 Northeast Cutoff, Box 15036

Worcester, Massachusetts 01615-0036 (508) 853-5000

ACS755100-DS, Rev. 2

Current Sensor: ACS755xCB-100

Nonlinearity (%) = 100

1 –

‰

3

Sensitivity (Sens): The change in sensor output in response to a 1A change through the primary conductor. The sensitivity is the

product of the magnetic circuit sensitivity (G /A) and the linear IC amplifier gain (mV/G). The linear IC amplifier gain is trimmed at the

factory to optimize the sensitivity (mV/A) for the full-scale current of the device.

The noise floor is derived from the thermal and shot noise observed in Hall elements. Dividing the noise (mV) by the sensitivity

(mV/A) provides the smallest current that the device is able to resolve.

full-scale amplitude. Nonlinearity in the output can be attributed to the saturation of the flux concentrator approaching the full-scale

current. The following equation is used to derive the linearity

Definitions of Accuracy Characteristics

where

magnetic hysteresis, and thermal drift.

netic offset error is highest when the magnetic circuit has been saturated, usually when the device has been subjected to a full-scale or

high-current overload condition. The magnetic offset is largely dependent on the material used as a flux concentrator. The larger mag-

netic offsets are observed at the lower operating temperatures.

total ouput error. The accuracy is illustrated graphically in the Output Voltage versus Current chart on the following page.

Accuracy is divided into four areas:

• 0 A at 25°C: Accuracy of sensing zero current flow at 25°C, without the effects of temperature.

• 0 A over temperature: Accuracy of sensing zero current flow including temperature effects.

• Full-scale current at 25°C: Accuracy of sensing the full-scale current at 25°C, without the effects of temperature.

• Full-scale current over Δ temperature: Accuracy of sensing full-scale current flow including temperature effects.