ACS711KLCTR-25AB-T Allegro Microsystems Inc, ACS711KLCTR-25AB-T Datasheet - Page 10

• Manufacturer Part Number: ACS711KLCTR-25AB-T
• Description: CURRENT SENSOR W/OVERCURRENT OUTPUT
• Manufacturer: Allegro Microsystems Inc
• Series: -r

Specifications of ACS711KLCTR-25AB-T

• Current - Sensing: ±25A
• Accuracy: ±5%
• Sensitivity: 55mV/A
• Current - Supply: 4mA
• Sensor Type: Hall Effect
• Voltage - Supply: 3 V ~ 5.5 V
• Output: Analog, Ratiometric
• Frequency: 100kHz
• Response Time: 100µs
• Polarization: Bidirectional
• Operating Temperature: -40°C ~ 125°C
• Package / Case: 8-SOIC (0.154", 3.90mm Width)
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

ACS711
Definitions of Accuracy Characteristics
Sensitivity (Sens). The change in sensor 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
full-scale current of the device.
Noise (V
and the noise floor for the Allegro Hall effect linear IC. The noise
floor is derived from the thermal and shot noise observed in Hall
elements. Dividing the noise (mV) by the sensitivity (mV/A) pro-
vides the smallest current that the device is able to resolve.
Linearity (E
the sensor varies in direct proportion to the primary current
through its full-scale amplitude. Nonlinearity in the output can be
attributed to the saturation of the flux concentrator approaching
the full-scale current. The following equation is used to derive the
linearity:
where V
sensed current approximates full-scale ±I
Symmetry (E
output from the sensor varies in proportion to either a positive
or negative full-scale primary current. The following formula is
used to derive symmetry:
Quiescent output voltage (V
when the primary current is zero. For a unipolar supply voltage,
it nominally remains at V
into V
the resolution of the Allegro linear IC quiescent voltage trim and
thermal drift.
Electrical offset voltage (V
put from its ideal quiescent value of V
causes. To convert this voltage to amperes, divide by the device
sensitivity, Sens.
100 1–
IOUT(Q)
[ {
IOUT_full-scale amperes
NOISE
100
Δ gain × % sat (
LIN
= 1.65 V. Variation in V
SYM

). The product of the linear IC amplifier gain (mV)
V
V
). The degree to which the voltage output from
2 (V
IOUT
IOUT(Q)
). The degree to which the absolute voltage
IOUT
_+ full-scale amperes – V
– V
_half-scale amperes – V
CC
V
IOUT
IOUT
= the output voltage (V) when the
OE
⁄ 2. Thus, V
IOUT(Q)
). The deviation of the device out-
_–full-scale amperes
_full-scale amperes – V
). The output of the sensor
IOUT(Q)
CC
Hall Effect Linear Current Sensor with Overcurrent
CC
/ 2 due to nonmagnetic
P
.
= 3.3 V translates
IOUT(Q)
can be attributed to
IOUT(Q)
Fault Output for < 100 V Isolation Applications

IOUT(Q)
)
)
[ {
–I
Accuracy (E
tion of the actual output from its ideal value. This is also known
as the total ouput error. The accuracy is illustrated graphically in
the output voltage versus current chart below.
Ratiometry. The ratiometric feature means that its 0 A output,
V
proportional to its supply voltage, V
used to derive the ratiometric change in 0 A output voltage,
V
The ratiometric change in sensitivity, Sens
P
(A)
IOUT(Q)
IOUT(Q)RAT
I
P
(min)
, (nominally equal to V
Output Voltage versus Sensed Current
Accuracy at 0 A and at Full-Scale Current
O e
TOT
Accuracy
O e
v r
(%).
v r
Temp erature
Accuracy
25°C Only
). The accuracy represents the maximum devia-
Temp erature
100
25°C Only
Accuracy
Accuracy
100

V
IOUT(Q)VCC

Sens
115 Northeast Cutoff
1.508.853.5000; www.allegromicro.com
Allegro MicroSystems, Inc.
Worcester, Massachusetts 01615-0036 U.S.A.
V
VCC
V
0 A
CC
Increasing V
CC
Decreasing V
CC
/2) and sensitivity, Sens, are
/ 3.3 V
Average
/ Sens
/ 3.3 V
V
/ V
CC
IOUT
IOUT(Q)3.3V
IOUT
Accuracy
25°C Only
. The following formula is
IOUT
(V)
3.3V
Full Scale
(V)
RAT


(%), is defined as:
I
P
(max)
O e
Accuracy
v r
+I
Temp erature
P
(A)
10