ACS754XCB-050 datasheet(4/11 Pages) ALLEGRO

4 / 11 page

115 Northeast Cutoff, Box 15036

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

ACS754050-DS, Rev. 3

Current Sensor: ACS754xCB-050

100 1–

[

{

[ {

Vout_full-scale amperes – VOUT(Q)

∆ gain × % sat (

)

2(Vout_half-scale amperes – VOUT(Q) )

100

[

Vout_+full-scale amperes –VOUT(Q)

VOUT(Q) –Vout_–full-scale amperes

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.

Noise (VNOISE): The product of the linear IC ampliﬁer gain (mV/G) and the noise ﬂoor for the Allegro Hall effect linear IC (≈1 G).

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.

Linearity (ELIN): The degree to which the voltage output from the sensor varies in direct proportion to the primary current through

its full-scale amplitude. Linearity reveals the maximum deviation from the ideal transfer curve for this transducer. Nonlinearity in the

output can be attributed to the gain variation across temperature and saturation of the ﬂux concentrator approaching the full-scale cur-

rent. The following equation is used to derive the linearity:

Deﬁnitions of Accuracy Characteristics

where

∆ gain = the gain variation as a function of temperature changes from 25ºC,

% sat = the percentage of saturation of the ﬂux concentrator, which becomes signiﬁcant as the current

being sensed approaches full-scale ±IP , and

Vout_full-scale amperes = the output voltage (V) when the sensed current approximates full-scale ±IP .

Symmetry (ESYM): The degree to which the absolute voltage output from the sensor varies in proportion to either a positive or nega-

tive full-scale primary current. The following equation is used to derive symmetry:

Quiescent output voltage (VOUT(Q)): The output of the sensor when the primary current is zero. For a unipolar supply voltage, it

nominally remains at VCC⁄ 2. Thus, VCC = 5 V translates into VOUT(Q) = 2.5 V. Variation in VOUT(Q) can be attributed to the resolution

of the Allegro linear IC quiescent voltage trim, magnetic hysteresis, and thermal drift.

Electrical offset voltage (VOE): The deviation of the device output from its ideal quiescent value of VCC⁄ 2 due to nonmagnetic causes.

Magnetic offset error (IERROM): The magnetic offset is due to the residual magnetism (remnant ﬁeld) of the core material. The mag-

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.

Accuracy (ETOT): The accuracy represents the maximum deviation of the actual output from its ideal value. This is also known as the

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 ∆ temperature: Accuracy of sensing full-scale current ﬂow including temperature effects.

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