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ACS720 Datasheet(PDF) 30 Page - Allegro MicroSystems |
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ACS720 Datasheet(HTML) 30 Page - Allegro MicroSystems |
30 / 35 page High Accuracy, Dual Fault, Galvanically Isolated Current Sensor in SOIC16 Wide-Body Package ACS720 30 Allegro MicroSystems, LLC 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com Sensitivity (Sens). The change in sensor IC output in response to a 1A change through the primary conductor. The sensitivity is the product of the magnetic circuit sensitivity (G/A) (1 G = 0.1 mT) and the linear IC amplifier gain (mV/G). The linear IC ampli- fier gain is programmed at the factory to optimize the sensitivity (mV/A) for the full-scale current of the device. Nonlinearity (ELIN). The nonlinearity is a measure of how linear the output of the sensor IC is over the full current measurement range. The nonlinearity is calculated as: E= LIN 1– V (I )– V IOUT PR(max) IOUT(Q ) 2×V(I/2) –V IOUT PR(max)IOUT(Q) ×100(%) where VIOUT(IPR(max)) is the output of the sensor IC with the maximum measurement current flowing through it and VIOUT(IPR(max)/2) is the output of the sensor IC with half of the maximum measurement current flowing through it. Zero-Current Output Voltage (VIOUT(Q)). The output of the sensor when the primary current is zero. VIOUT(Q) is nominally 1.5 V. Variation in VIOUT(Q) can be attributed to the resolution of the Allegro linear IC quiescent voltage trim and thermal drift. Offset Voltage (VOE). The deviation of the device output from its ideal quiescent value of 1.5 V due to nonmagnetic causes. To convert this voltage to amperes, divide by the device sensitivity, Sens. Total Output Error (ETOT). The difference between the cur- rent measurement from the sensor IC and the actual current (IP), relative to the actual current. This is equivalent to the difference between the ideal output voltage and the actual output voltage, divided by the ideal sensitivity, relative to the current flowing through the primary conduction path: E (I ) TOTP V (I )– V (I ) IOUT_ideal PIOUTP Sens (I )×I ideal PP × 100 (%) = The Total Output Error incorporates all sources of error and is a function of IP. At relatively high currents, ETOT will be mostly due to sensitivity error, and at relatively low currents, ETOT will be mostly due to Offset Voltage (VOE). In fact, at IP = 0, ETOT approaches infinity due to the offset. This is illustrated in Figure 11 and Figure 12. Figure 11 shows a distribution of output volt- ages versus IP at 25°C and across temperature. Figure 12 shows the corresponding ETOT versus IP. DEFINITIONS OF ACCURACY CHARACTERISTICS Figure 11: Output Voltage versus Sensed Current Figure 12: Total Output Error versus Sensed Current 0 A Decreasing VIOUT (V) Accuracy Across Temperature Accuracy Across Temperature Accuracy Across Temperature Accuracy at 25°C Only Accuracy at 25°C Only Accuracy at 25°C Only Increasing VIOUT (V) Ideal VIOUT IPR(min) IPR(max) +IP (A) –IP (A) VIOUT(Q) Full Scale IP +IP –IP +ETOT –ETOT Across Temperature 25°C Only (6) (7) |
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