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ACS780XLR Datasheet(PDF) 15 Page - Allegro MicroSystems

Part No. ACS780XLR
Description  Core-less, micro-sized, 100 A continuous current package
Download  24 Pages
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Maker  ALLEGRO [Allegro MicroSystems]
Homepage  http://www.allegromicro.com
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ACS780XLR Datasheet(HTML) 15 Page - Allegro MicroSystems

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High-Precision Linear Hall-Effect-Based
Current Sensor IC With 200 µΩ Current Conductor
ACS780xLR
15
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
Definitions of Accuracy Characteristics
CHARACTERISTIC DEFINITIONS
SENSITIVITY (Sens)
The change in device output in response to a 1 A change through
the primary conductor. The sensitivity is the product of the mag-
neticcircuitsensitivity(G/A)andthelinearICamplifiergain
(mV/G).ThelinearICamplifiergainisprogrammedatthefactory
to optimize the sensitivity (mV/A) for the half-scale current of the
device.
NOISE (VNOISE)
The noise floor is derived from the thermal and shot noise
observed in Hall elements. Dividing the noise (mV) by the sensi-
tivity (mV/A) provides the smallest current that the device is able
to resolve.
NONLINEARITY (ELIN)
The ACS770 is designed to provide a linear output in response
toarampingcurrent.Considertwocurrentlevels:I1andI2.Ide-
ally, the sensitivity of a device is the same for both currents, for
a given supply voltage and temperature. Nonlinearity is present
when there is a difference between the sensitivities measured at
I1 and I2. Nonlinearity is calculated separately for the positive
(ELINpos)andnegative(ELINneg)appliedcurrentsasfollows:
ELINpos = 100 (%) × {1 – (SensIPOS2/ SensIPOS1) }
ELINneg = 100 (%) × {1 – (SensINEG2/ SensINEG1)}
where:
SensIx = (VIOUT(Ix) – VIOUT(Q))/ Ix
and IPOSx and INEGx are positive and negative currents.
Then:
ELIN=max(ELINpos,ELINneg )
RATIOMETRY
The device features a ratiometric output. This means that the
quiescent voltage output, VOUTQ, and the magnetic sensitivity,
Sens, are proportional to the supply voltage, VCC.The ratiometric
change(%)inthequiescentvoltageoutputisdefinedas:
VCC 5 V
VOUT(Q)(VCC) VOUT(Q)(5V)
RatERRVOUT(Q) =
× 100
%
1 –
( )
andtheratiometricchange(%)insensitivityisdefinedas:
VCC 5 V
Sens(VCC) Sens(5V)
RatERRSens =
× 100
%
1 –
( )
QUIESCENT OUTPUT VOLTAGE (VOUT(Q))
Theoutputofthedevicewhentheprimarycurrentiszero.For
bidirectional sensors, it nominally remains at VCC⁄2andforuni-
directional sensors at 0.1 × VCC. Thus, VCC = 5 V translates into
VOUT(BI) = 2.5 V and VOUT(QU) = 0.5 V. Variation in VOUT(Q)can
be attributed to the resolution of the Allegro linear IC quiescent
voltage trim and thermal drift.
ELECTRICAL OFFSET VOLTAGE (VOE)
The deviation of the device output from its ideal quiescent value
due to nonmagnetic causes.
TOTAL OUTPUT ERROR (ETOT)
The maximum deviation of the actual output from its ideal value,
also referred to as accuracy, illustrated graphically in the output
voltage versus current chart on the following page.
ETOTisdividedintofourareas:
• 0 A at 25°C. Accuracy at the zero current flow at 25°C,
without 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 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.
=
× 100 (%)
ETOT(IP)
VIOUT(IP) – VIOUT_IDEAL(IP)
SensIDEAL × IP
where
VIOUT_IDEAL(IP) = VIOUT(Q)+ (SensIDEAL × IP )


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