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ACS755LCB-100-PFF Datasheet(PDF) 4 Page - Allegro MicroSystems |
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ACS755LCB-100-PFF Datasheet(HTML) 4 Page - Allegro MicroSystems |
4 / 10 page 4 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 ACS755100-DS, Rev. 2 Current Sensor: ACS755xCB-100 Nonlinearity (%) = 100 1 – Vout _1/4 full-scale IP –VOUT(Q) Vout _3/4 full-scale IP –VOUT(Q) ‰ 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. 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. 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 Vout_¼ full-scale IP (V) is the output voltage when the sensed current approximates 0.25 × IP(max), and Vout_¾ full-scale IP (V) is the output voltage when the sensed current approximates 0.75 × IP(max). 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 0.6 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 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 Δ temperature: Accuracy of sensing full-scale current flow including temperature effects. |
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