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ACS713
Fully Integrated, Hall Effect-Based Linear Current Sensor IC
with 2.1 kVRMS Isolation and a Low-Resistance Current Conductor
Definitions of Accuracy Characteristics
{ [ [{
( V IOUT _full-scale amperes – V IOUT(Q) )
2 ( V IOUT _half-scale amperes – V IOUT(Q) )
?
?
Sensitivity (Sens). Thechangeindeviceoutputinresponsetoa
1 A 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 (V NOISE ). 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 (E LIN ). 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:
100 1–
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.
Ratiometry . The ratiometric feature means that its 0 A output,
V IOUT(Q) , (nominally equal to V CC × 0.1 ) and sensitivity, Sens, are
proportional to its supply voltage, V CC . The following formula is
used to derive the ratiometric change in 0 A output voltage,
? V IOUT(Q)RAT (%).
V IOUT(Q)VCC / V IOUT(Q)5V
100
V CC / 5 V
The ratiometric change in sensitivity, ? Sens RAT (%), is defined as:
where V IOUT_full-scale amperes = the output voltage (V) when the
sampled current approximates full-scale ±I P .
Quiescent output voltage (V IOUT(Q) ). The output of the device
when the primary current is zero. For a unipolar supply voltage,
100
?
Sens VCC / Sens 5V
V CC / 5 V
?
it nominally remains at V CC × 0.1 . Thus, V CC = 5 V translates
into V IOUT(Q) = 0.5 V. Variation in V IOUT(Q) can be attributed to
the resolution of the Allegro linear IC quiescent voltage trim and
thermal drift.
Electrical offset voltage (V OE ). The deviation of the device
output from its ideal quiescent value of V CC × 0.1 due to nonmag-
netic causes. To convert this voltage to amperes, divide by the
device sensitivity, Sens.
Accuracy (E TOT ). The accuracy represents the maximum devia-
tion of the actual output from its ideal value. This is also known
Output Voltage versus Sampled Current
Accuracy at 0 A and at Full-Scale Current
Increasing V IOUT (V)
Accuracy
25°C Only
Average
V IOUT
Accuracy
O v e r Temp erature
Accuracy
25°C Only
Accuracy
O v e r Temp erature
as the total output error. The accuracy is illustrated graphically in
the output voltage versus current chart at right.
–I P (A)
Full Scale
30 A
+I P (A)
0A
Decreasing V IOUT (V)
Allegro MicroSystems, LLC
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
8
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