ACS711 Allegro MicroSystems, Inc., ACS711 Datasheet

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ACS711

Manufacturer Part Number
ACS711
Description
Hall Effect Linear Current Sensor With Overcurrent Fault Output For
Manufacturer
Allegro MicroSystems, Inc.
Datasheet

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Features and Benefits
▪ No external sense resistor required; single package solution
▪ 1.2 mΩ internal conductor resistance; reduced power loss
▪ Economical low- and high-side current sensing
▪ Output voltage proportional to AC or DC currents
▪ ±12.5 A and ±25 A full scale sensing ranges
▪ Overcurrent ¯ F ¯ ¯ A ¯¯ U ¯¯ L ¯¯ T ¯ trips and
▪ Low-noise analog signal path
▪ 100 kHz bandwidth
▪ Small footprint, low-profile SOIC8 package
▪ 3.0 to 5.5 V, single supply operation
▪ Integrated electrostatic shield for output stability
▪ Factory-trimmed for accuracy
▪ Extremely stable output offset voltage
▪ Zero magnetic hysteresis
▪ Ratiometric output from supply voltage
Package: 8 Lead SOIC (suffix LC)
ACS711-DS
Approximate Scale 1:1
Hall Effect Linear Current Sensor with Overcurrent
Fault Output for <100 V Isolation Applications
l
atches at 100% of full-scale current
Application 1. The ACS711 outputs an analog signal, V
that varies linearly with the bi-directional AC or DC primary
current, I
when I
P
reaches ±100% of its full-scale current.
I
P
P
, within the range specified. The ¯ F ¯ ¯ A ¯ U ¯ ¯ L ¯ ¯ T ¯ pin trips
1
2
3
4
Typical Application
IP+
IP+
IP–
IP–
ACS711
VIOUT
FAULT
GND
VCC
8
7
6
5
Description
The Allegro
solutions for AC or DC current sensing in <100 V audio,
communications systems, white goods, and automotive
applications. The device package allows for easy implementation
by the customer. Typical applications include circuit protection,
current monitoring, and motor and inverter control.
The device consists of a linear Hall sensor circuit with a copper
conduction path located near the surface of the die. Applied
current flowing through this copper conduction path generates
a magnetic field which is sensed by the integrated Hall IC
and converted into a proportional voltage. Device accuracy is
optimized through the close proximity of the magnetic signal
to the Hall transducer.
The output of the device has a positive slope proportional to
the current flow from IP+ to IP– (pins 1 and 2, to pins 3 and
4). The internal resistance of this conductive path is 1.2 mΩ
typical, providing a non-intrusive measurement interface that
saves power in applications that require energy efficiency.
The ACS711 is optimized for low-side current sensing
applications, although the terminals of the conductive path are
electrically isolated from the sensor leads (pins 5 through 8),
providing sufficient internal creepage and clearance dimensions
for a low AC or DC working voltage applications. The thickness
Continued on the next page…
+3.3 V
R
PU
®
C
0.1 μF
BYP
ACS711 provides economical and precise
IOUT
C
LOAD
,
ACS711

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ACS711 Summary of contents

Page 1

... Factory-trimmed for accuracy ▪ Extremely stable output offset voltage ▪ Zero magnetic hysteresis ▪ Ratiometric output from supply voltage Package: 8 Lead SOIC (suffix LC) Approximate Scale 1:1 Application 1. The ACS711 outputs an analog signal, V that varies linearly with the bi-directional primary current, I when I ACS711-DS Description The Allegro ® ...

Page 2

... Description (continued) of the copper conductor allows survival of the device 5× overcurrent conditions. The ACS711 is provided in a small, surface mount SOIC8 package. The leadframe is plated with 100% matte tin, which is compatible with standard lead (Pb) free printed circuit board assembly processes. ...

Page 3

... ACS711 V CC VCC Master Current Supply Hall Current Drive IP+ IP Terminal List Table Number 1 and 2 3 and Hall Effect Linear Current Sensor with Overcurrent Fault Output for < 100 V Isolation Applications Functional Block Diagram Current Fault To all subcircuits Comparator ...

Page 4

... ACS711 COMMON OPERATING CHARACTERISTICS Characteristic Symbol ELECTRICAL CHARACTERISTICS Supply Voltage V CC Supply Current I CC Output Capacitance Load C LOAD Output Resistive Load R LOAD Primary Conductor R IP Resistance VIOUT Rise Time t r Propagation Delay Time t PROP Response Time t RESPONSE Internal Bandwidth Nonlinearity ...

Page 5

... ACS711 x12.5A PERFORMANCE CHARACTERISTICS for E TEMPERATURE RANGE Characteristic Symbol Optimized Accuracy Range I P Sensitivity Sens Noise 2 V NOISE V OE(TA) Electrical Offset Voltage V OE(TOP)HT V OE(TOP)LT 3 Total Output Error E TOT 1 See Characteristic Performance Data for parameter distributions over temperature. 2 ±3 sigma noise voltage. 3 Percentage with I = ± ...

Page 6

... ACS711 x25A PERFORMANCE CHARACTERISTICS for E TEMPERATURE RANGE Characteristic Symbol Optimized Accuracy Range I P Sensitivity Sens Noise 2 V NOISE V OE(TA) Electrical Offset Voltage V OE(TOP)HT V OE(TOP)LT 3 Total Output Error E TOT 1 See Characteristic Performance Data for parameter distributions over temperature. 2 ±3 sigma noise voltage. 3 Percentage with I = ± ...

Page 7

... T (°C) A Hall Effect Linear Current Sensor with Overcurrent Fault Output for < 100 V Isolation Applications Characteristic Performance Data Data taken using the ACS711KLC-12A, V Accuracy Data 114 113 112 111 110 109 108 107 60 80 100 120 140 – ...

Page 8

... T (°C) A Hall Effect Linear Current Sensor with Overcurrent Fault Output for < 100 V Isolation Applications Characteristic Performance Data Data taken using the ACS711KLC-25A, V Accuracy Data 57.0 56.5 56.0 55.5 55.0 54.5 54.0 53 100 120 140 –60 100.8 100.6 100.4 100.2 100 ...

Page 9

... Rise Time 3.47 μ μs/div.) Response Time 4.62 μ μs/div.) Hall Effect Linear Current Sensor with Overcurrent Fault Output for < 100 V Isolation Applications Characteristic Performance Data Data taken using the ACS711KLC-25A Timing Data V (0.5 V/div.) IOUT I (10 A/div (0.5 V/div.) ...

Page 10

... ACS711 Definitions of Accuracy Characteristics Sensitivity (Sens). The change in sensor output in response change through the primary conductor. The sensitivity is the product of the magnetic circuit sensitivity ( 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 ...

Page 11

... ACS711 Definitions of Dynamic Response Characteristics ). When the supply is ramped to its operat- Power-On Time (t PO ing voltage, the device requires a finite time to power its internal components before responding to an input magnetic field. Power-On Time defined as the time it takes for the output PO voltage to settle within ± ...

Page 12

... ACS711 0.10 C 0.51 0.31 1.27 BSC For Reference Only; not for tooling use (reference MS-012AA) Dimensions in millimeters Dimensions exclusive of mold flash, gate burrs, and dambar protrusions Exact case and lead configuration at supplier discretion within limits shown A Terminal #1 mark area Branding scale and appearance at supplier discretion ...

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