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ACS720 Datasheet(PDF) 30 Page - Allegro MicroSystems

Part # ACS720
Description  High Accuracy, Dual Fault, Galvanically Isolated Current Sensor in SOIC16 Wide-Body Package
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Manufacturer  ALLEGRO [Allegro MicroSystems]
Direct Link  http://www.allegromicro.com
Logo ALLEGRO - Allegro MicroSystems

ACS720 Datasheet(HTML) 30 Page - Allegro MicroSystems

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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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