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ACS754 Datasheet(PDF) 6 Page - Allegro MicroSystems |
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ACS754 Datasheet(HTML) 6 Page - Allegro MicroSystems |
6 / 9 page Fully Integrated, Hall Effect-Based Linear Current Sensor IC with High Voltage Isolation and a Low-Resistance Current Conductor ACS754xCB-200 5 Allegro MicroSystems, Inc. 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com Sensitivity (Sens). The change in device 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 pro- grammed 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 IC varies in direct proportion to the primary current through its full-scale amplitude. Nonlinearity in the output can be attrib- uted to the saturation of the flux concentrator approaching the full-scale current. The following equation is used to derive the linearity: where ∆ gain = the gain variation as a function of temperature changes from 25ºC, % sat = the percentage of saturation of the flux concentra- tor, which becomes significant as the current being sampled approaches full-scale ±IP , and VIOUT_full-scale amperes = the output voltage (V) when the sampled current approximates full-scale ±IP . Symmetry (ESYM). The degree to which the absolute voltage output from the IC varies in proportion to either a positive or negative full-scale primary current. The following equation is used to derive symmetry: Quiescent output voltage (VIOUT(Q)). The output of the device when the primary current is zero. For a unipolar supply voltage, it nominally remains at VCC⁄ 2. Thus, VCC = 5 V translates into VIOUT(Q) = 2.5 V. Variation in VOUT(Q) can be attributed to the res- olution of the Allegro linear IC quiescent voltage trim, magnetic hysteresis, and thermal drift. Electrical offset voltage (VOE). The deviation of the device out- put 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 magnetic 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 magnetic offsets are observed at the lower operating temperatures. Accuracy (ETOT). The accuracy represents the maximum devia- tion of the actual output from its ideal value. This is also known as the total output 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 at the zero current flow at 25°C, with- out the effects of temperature. 0 A over Δ temperature. Accuracy at the zero current flow including temperature effects. Full-scale current at 25°C. Accuracy at the the full-scale current at 25°C, without the effects of temperature. Full-scale current over Δ temperature. Accuracy at the full- scale current flow including temperature effects. Definitions of Accuracy Characteristics 100 1– [ { [ { VIOUT_full-scale amperes – VIOUT(Q) Δ gain × % sat ( ) 2 (VIOUT_half-scale amperes – VIOUT(Q) ) 100 VIOUT_+ full-scale amperes – VIOUT(Q) VIOUT(Q) – VIOUT_–full-scale amperes |
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