ACS756KCA-050B-PFF-T Allegro Microsystems Inc, ACS756KCA-050B-PFF-T Datasheet - Page 7

• Manufacturer Part Number: ACS756KCA-050B-PFF-T
• Description: IC, LINEAR CURRENT SENSOR, 10mA, PFF-5
• Manufacturer: Allegro Microsystems Inc
• Series: -r

Specifications of ACS756KCA-050B-PFF-T

• Quiescent Current: 10mA
• Bandwidth: 120kHz
• Sensor Case Style: PFF
• No. Of Pins: 5
• Supply Voltage Range: 3V To 5.5V
• Operating Temperature Range: -40°C To +125°C
• Polarization: Bipolar
• Current - Sensing: ±50A
• Accuracy: ±1%
• Sensitivity: 40mV/A
• Current - Supply: 14mA
• Sensor Type: Closed Loop
• Voltage - Supply: 3 V ~ 5 V
• Output: -
• Frequency: 120kHz
• Response Time: -
• Operating Temperature: -40°C ~ 125°C
• Package / Case: 5-CA Formed Leads
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

ACS756
Definitions of Accuracy Characteristics
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 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
half-scale current of the device.
Noise (V
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.
Nonlinearity (E
from the IC varies in direct proportion to the primary current
through its half-scale amplitude. Nonlinearity in the output can be
attributed to the saturation of the flux concentrator approaching
the half-scale current. The following equation is used to derive
the linearity:
where
Symmetry (E
output from the IC varies in proportion to either a positive or
negative half-scale primary current. The following equation is
used to derive symmetry:
Ratiometry. The device features a ratiometric output. This
means that the quiescent voltage output, V
netic sensitivity, Sens, are proportional to the supply voltage, V
∆ 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 half-scale ±I
V
sampled current approximates half-scale ±I
100 1–
IOUT_half-scale amperes
[ {
NOISE
100
Δ gain × % sat (
SYM
). The noise floor is derived from the thermal and

2 (V
V
V
LIN
IOUT
IOUT(Q)
). The degree to which the absolute voltage
). The degree to which the voltage output
IOUT
_+ half-scale amperes – V
= the output voltage (V) when the
_quarter-scale amperes – V
– V
V
P
IOUT
IOUT
, and
_half-scale amperes – V
_–half-scale amperes
with 3 kVRMS Voltage Isolation and a Low-Resistance Current Conductor
IOUTQ
IOUT(Q)
P
.
, and the mag-
IOUT(Q)

IOUT(Q)
Fully Integrated, Hall Effect-Based Linear Current Sensor IC
)
)
[ {
CC
.
The ratiometric change (%) in the quiescent voltage output is
defined as:
and the ratiometric change (%) in sensitivity is defined as:
Quiescent output voltage (V
when the primary current is zero. For a unipolar supply voltage,
it nominally remains at V
V
olution of the Allegro linear IC quiescent voltage trim, magnetic
hysteresis, and thermal drift.
Electrical offset voltage (V
put from its ideal quiescent value of V
causes.
Magnetic offset error (I
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.
Total Output Error (E
actual output from its ideal value, also referred to as accuracy,
illustrated graphically in the output voltage versus current chart
on the following page.
E
 0 A at 25°C. Accuracy at the zero current flow at 25°C, with-
 0 A over Δ temperature. Accuracy at the zero current flow
 Half-scale current at 25°C. Accuracy at the the half-scale current
 Half-scale current over Δ temperature. Accuracy at the half-
IOUT(Q)
TOT
out the effects of temperature.
including temperature effects.
at 25°C, without the effects of temperature.
scale current flow including temperature effects.
is divided into four areas:
= 2.5 V. Variation in V
V
IOUTQ( V)
Sens
( V
=
=
TOT
Sens
CC
ERROM
V
115 Northeast Cutoff
1.508.853.5000; www.allegromicro.com
Allegro MicroSystems, Inc.
Worcester, Massachusetts 01615-0036 U.S.A.
OE
). The maximum deviation of the
⁄ 2. Thus, V
IOUTQ(V
(V
IOUT(Q)
V
). The deviation of the device out-
CC
CC
OUT(Q)
). The magnetic offset is due to
V
CC
CC
5 V
Sens
). The output of the device
)
CC
can be attributed to the res-
CC
V
5 V
⁄ 2 due to nonmagnetic
( V
IOUTQ(5V)
= 5 V translates into
%
%
7