Data Sheet

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Features and Benefits

▪ Noexternalsenseresistorrequired;singlepackagesolution

▪ ReducedPowerLoss:

▫0.6mΩinternalconductorresistanceonEXpackage

▫1.2mΩinternalconductorresistanceonLCpackage

▪ 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onLCpackage

▪ ±15.5Aand±31AfullscalesensingrangesonEXpackage

▪ Overcurrent



tripsand

latchesat100%offull-scalecurrent

▪ Low-noiseanalogsignalpath

▪ 100kHzbandwidth

▪ Smallfootprint,low-profileSOIC8andQFNpackages

▪ 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

Description

The Allegro

™

 ACS711 provides economical and precise

solutions forAC or DC current sensing in <100 V audio,

communicationssystems,andwhitegoods.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0.6mΩ

fortheEXpackage,and1.2mΩfortheLCpackage,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ICleads,providing

sufficientinternalcreepage and clearance dimensions for a

lowACorDCworkingvoltageapplications.Thethickness

IP+

IP–

GND

ACS711

+3.3 V

VIOUT

VCC

BYP

0.1 μF

LOAD

FAULT

ACS711

ACS711A-DS, Rev. 3

Hall Effect Linear Current Sensor with Overcurrent

Fault Output for <100 V Isolation Applications

Continued on the next page…

ApproximateScale1:1

Packages:

Typical Application

8-pinSOICN

withinternallyfusedpath

(LCpackage)

12-contactQFN

3mm×3mm×0.75mm

(EXpackage)

Application 1. The ACS711 outputs an analog signal, V

IOUT

, that varies linearly with the

bi-directional AC or DC primary current, I

, within the range specified. The

¯¯

pin trips

when I

reaches ±100% of its full-scale current.

Summary of content (16 pages)

PAGE 1
ACS711 Hall Effect Linear Current Sensor with Overcurrent Fault Output for <100 V Isolation Applications Features and Benefits Description ▪ No external sense resistor required; single package solution ▪ Reduced Power Loss: ▪ ▪ ▪ ▪ ▪ ▪ ▪ ▪ ▪ ▪ ▪ ▪ ▪ ▪ ▫ 0.6 mΩ internal conductor resistance on EX package ▫ 1.2 mΩ internal conductor resistance on LC package Economical low- and high-side current sensing Output voltage proportional to AC or DC currents ±12.
PAGE 2
Hall Effect Linear Current Sensor with Overcurrent Fault Output for < 100 V Isolation Applications ACS711 Description (continued) of the copper conductor allows survival of the device at up to 5× overcurrent conditions. assembly processes. Internally, the device is Pb-free, except for flip-chip high-temperature Pb‑based solder balls, currently exempt from RoHS. The device is fully calibrated prior to shipment from the factory. The ACS711 is provided in small, surface mount packages: SOIC8 and QFN12.
PAGE 3
Hall Effect Linear Current Sensor with Overcurrent Fault Output for < 100 V Isolation Applications ACS711 Functional Block Diagram VCC VCC RPU Master Current Supply Current Fault Comparator To all subcircuits D Power-on Reset IP+ Hall Current Drive IP− 240 kΩ Reset Sensitivity Temperature Coefficient Trim Dynamic Offset Cancellation IP+ CBYP FAULT VIOUT Signal Recovery CLOAD Sensitivity Trim 0 Ampere Offset Adjust IP− GND VCC VIOUT 12 11 Pin-out Diagrams 1 8 VCC NC IP+ 2 7
PAGE 4
Hall Effect Linear Current Sensor with Overcurrent Fault Output for < 100 V Isolation Applications ACS711 COMMON OPERATING CHARACTERISTICS Valid across the full range of TA for the LC package and at TA = 25°C for the EX package, VCC = 3.3 V, unless otherwise specified Characteristic Symbol Test Conditions Min. Typ. Max. Units 3 3.3 5.5 V – 4 5.5 mA ELECTRICAL CHARACTERISTICS Supply Voltage1 VCC Supply Current ICC VCC = 3.
PAGE 5
Hall Effect Linear Current Sensor with Overcurrent Fault Output for < 100 V Isolation Applications ACS711 x12AB PERFORMANCE CHARACTERISTICS for LC package and E Temperature Range1 TA = 25°C and VCC = 3.3 V, unless otherwise specified Characteristic Optimized Accuracy Range Sensitivity Noise2 Electrical Offset Voltage Total Output Error3 Symbol Test Conditions IP Min. Typ. Max. Units –12.5 – 12.
PAGE 6
Hall Effect Linear Current Sensor with Overcurrent Fault Output for < 100 V Isolation Applications ACS711 x25AB PERFORMANCE CHARACTERISTICS for for LC package and E Temperature Range1 TA = 25°C and VCC = 3.3 V, unless otherwise specified Characteristic Optimized Accuracy Range Sensitivity Noise2 Electrical Offset Voltage Total Output Error3 Symbol Test Conditions IP Min. Typ. Max.
PAGE 7
ACS711 Hall Effect Linear Current Sensor with Overcurrent Fault Output for < 100 V Isolation Applications Thermal Characteristics Characteristic Package Thermal Resistance, Junction to Lead Package Thermal Resistance, Junction to Ambient2 Symbol RθJL RθJA Value Units LC package, mounted on Allegro ASEK 711 evaluation board Test Conditions1 5 ºC/W LC package, mounted on Allegro 85-0404 evaluation board, includes the power consumed by the board 23 ºC/W EX package, mounted on Allegro 85-0528 eval
PAGE 8
Hall Effect Linear Current Sensor with Overcurrent Fault Output for < 100 V Isolation Applications ACS711 Characteristic Performance Data Data taken using the ACS711KLC-12A, VCC = 3.
PAGE 9
Hall Effect Linear Current Sensor with Overcurrent Fault Output for < 100 V Isolation Applications ACS711 Characteristic Performance Data Data taken using the ACS711KLC-25A, VCC = 3.3 V Accuracy Data Electrical Offset Voltage versus Ambient Temperature 40 57.0 30 56.5 Sens (mV/A) 20 VOE (mV) Sensitivity versus Ambient Temperature 10 0 -10 55.5 55.0 54.5 -20 54.0 -30 -40 –60 56.0 –40 –20 0 20 40 60 80 100 120 53.
PAGE 10
Hall Effect Linear Current Sensor with Overcurrent Fault Output for < 100 V Isolation Applications ACS711 Characteristic Performance Data Data taken using the ACS711KLC-25A Timing Data Rise Time Propagation Delay Time VIOUT (0.5 V/div.) VIOUT (0.5 V/div.) IP (10 A/div.) IP (10 A/div.) 3.47 µs 1.24 µs t (2 µs/div.) t (2 µs/div.) Response Time Fault Response VIOUT (0.5 V/div.) IP (10 A/div.) 4.62 µs IP (10 A/div.) 1.28 µs Fault (2 V/div.) t (2 µs/div.) t (2 µs/div.
PAGE 11
ACS711 Hall Effect Linear Current Sensor with Overcurrent Fault Output for < 100 V Isolation Applications 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 programmed at the factory to optimize the sensitivity (mV/A) for the full-scale current of the device.
PAGE 12
ACS711 Hall Effect Linear Current Sensor with Overcurrent Fault Output for < 100 V Isolation Applications Definitions of Dynamic Response Characteristics Power-On Time (tPO). When the supply is ramped to its operating voltage, the device requires a finite time to power its internal components before responding to an input magnetic field.
PAGE 13
Hall Effect Linear Current Sensor with Overcurrent Fault Output for < 100 V Isolation Applications ACS711 Application Information Layout To optimize thermal and electrical performance, the following features should be included in the printed circuit board: • The primary leads should be connected to as much copper area as is available. • The copper should be 2 oz. or heavier.
PAGE 14
Hall Effect Linear Current Sensor with Overcurrent Fault Output for < 100 V Isolation Applications ACS711 Package LC, 8-pin SOIC 4.90 ±0.10 8° 0° 8 0.65 3.90 ±0.10 1 6.00 ±0.20 2 0.25 BSC Branded Face SEATING PLANE 0.10 C 0.51 0.31 1.27 BSC 5.60 1.04 REF 1 1.27 0.40 8X C 1.27 1.75 0.25 0.17 A 8 C 2 PCB Layout Reference View SEATING PLANE GAUGE PLANE NNNNNNN TPP-AAA LLLLL 1.75 MAX 0.25 0.
PAGE 15
Hall Effect Linear Current Sensor with Overcurrent Fault Output for < 100 V Isolation Applications ACS711 Package EX, 12-Contact QFN With Fused Sensed Current Loop 3.00 BSC 0.85 12 1 1.27 MIN 0.30 12 1 A 2 3.00 BSC 2.90 1.00 0.80 MIN Branded Face 9X 0.50 D SEATING PLANE 0.08 C 0.50 BSC C 0.70 2.05 REF 0.75 ±0.05 C 2.70 PCB Layout Reference View +0.05 0.25 –0.07 1 1.79 0.40±0.10 B 0.
PAGE 16
Hall Effect Linear Current Sensor with Overcurrent Fault Output for < 100 V Isolation Applications ACS711 Revision History Revision No.