ACS712

IP+IP+IP–IP–IP5GND2413ACS71278+5VVIOUTVOUT6FILTERVCCCBYP0.1μFCF1nFApplication1.TheACS712outputsananalogsignal,VOUT.thatvarieslinearlywiththeuni-orbi-directionalACorDCprimarysensedcurrent,IP,withintherangespecified.CFisrecommendedfornoisemanagement,withvaluesthatdependontheapplication.ACS712DescriptionTheAllegro®ACS712provideseconomicalandprecisesolutionsforACorDCcurrentsensinginindustrial,commercial,andcommunicationssystems.Thedevicepackageallowsforeasyimplementationbythecustomer.Typicalapplicationsincludemotorcontrol,loaddetectionandmanagement,switched-modepowersupplies,andovercurrentfaultprotection.Thedeviceconsistsofaprecise,low-offset,linearHallsensorcircuitwithacopperconductionpathlocatednearthesurfaceofthedie.AppliedcurrentflowingthroughthiscopperconductionpathgeneratesamagneticfieldwhichissensedbytheintegratedHallICandconvertedintoaproportionalvoltage.DeviceaccuracyisoptimizedthroughthecloseproximityofthemagneticsignaltotheHalltransducer.Aprecise,proportionalvoltageisprovidedbythelow-offset,chopper-stabilizedBiCMOSHallIC,whichisprogrammedforaccuracyafterpackaging.Theoutputofthedevicehasapositiveslope(VIOUT(Q))whenanincreasingcurrentflowsthroughtheprimarycopperconductionpath(frompins1and2,topins3and4),whichisthepathusedforcurrentsensing.Theinternalresistanceofthisconductivepathis1.2mΩtypical,providinglowpowerACS712-DS,Rev.7FeaturesandBenefits▪Low-noiseanalogsignalpath▪DevicebandwidthissetviathenewFILTERpin▪5μsoutputrisetimeinresponsetostepinputcurrent▪80kHzbandwidth▪Totaloutputerror1.5%atTA=25°C▪Smallfootprint,low-profileSOIC8package▪1.2mΩinternalconductorresistance▪2.1kVRMSminimumisolationvoltagefrompins1-4topins5-8▪5.0V,singlesupplyoperation▪66to185mV/Aoutputsensitivity▪OutputvoltageproportionaltoACorDCcurrents▪Factory-trimmedforaccuracy▪Extremelystableoutputoffsetvoltage▪Nearlyzeromagnetichysteresis▪RatiometricoutputfromsupplyvoltageFullyIntegrated,HallEffect-BasedLinearCurrentSensorwith2.1kVRMSVoltageIsolationandaLow-ResistanceCurrentConductorContinuedonthenextpage…ApproximateScale1:1Package:8LeadSOIC(suffixLC)TypicalApplicationTÜVAmericaCertificateNumber:U8V060554214010FullyIntegrated,HallEffect-BasedLinearCurrentSensorwith2.1kVRMSVoltageIsolationandaLow-ResistanceCurrentConductorACS7122AllegroMicroSystems,Inc.115NortheastCutoffWorcester,Massachusetts01615-0036U.S.A.1.508.853.5000;–0.1VOutputVoltageVIOUT8VReverseOutputVoltageVRIOUT–0.1VReinforcedIsolationVoltageVISOPins1-4and5-8;60Hz,1minute,TA=25°C2100VVoltageappliedtoleadframe(Ip+pins),basedonIEC60950184VpeakBasicIsolationVoltageVISO(bsc)Pins1-4and5-8;60Hz,1minute,TA=25°C1500VVoltageappliedtoleadframe(Ip+pins),basedonIEC60950354VpeakOutputCurrentSourceIIOUT(Source)3mAOutputCurrentSinkIIOUT(Sink)10mAOvercurrentTransientToleranceIP1pulse,100ms100ANominalOperatingAmbientTemperatureTARangeE–40to85ºCMaximumJunctionTemperatureTJ(max)165ºCStorageTemperatureTstg–65to170ºCSelectionGuidePartNumberPacking*TA(°C)OptimizedRange,IP(A)Sensitivity,Sens(Typ)(mV/A)ACS712ELCTR-05B-TTapeandreel,3000pieces/reel–40to85±5185ACS712ELCTR-20A-TTapeandreel,3000pieces/reel–40to85±20100ACS712ELCTR-30A-TTapeandreel,3000pieces/reel–40to85±3066*ContactAllegroforadditionalpackingoptions.loss.Thethicknessofthecopperconductorallowssurvivalofthedeviceatupto5×overcurrentconditions.Theterminalsoftheconductivepathareelectricallyisolatedfromthesensorleads(pins5through8).ThisallowstheACS712currentsensortobeusedinapplicationsrequiringelectricalisolationwithouttheuseofopto-isolatorsorothercostlyisolationtechniques.TheACS712isprovidedinasmall,surfacemountSOIC8package.Theleadframeisplatedwith100%mattetin,whichiscompatiblewithstandardlead(Pb)freeprintedcircuitboardassemblyprocesses.Internally,thedeviceisPb-free,exceptforflip-chiphigh-temperaturePb-basedsolderballs,currentlyexemptfromRoHS.Thedeviceisfullycalibratedpriortoshipmentfromthefactory.Description(continued)ParameterSpecificationFireandElectricShockCAN/CSA-C22.2No.60950-1-03UL60950-1:2003EN60950-1:2001FullyIntegrated,HallEffect-BasedLinearCurrentSensorwith2.1kVRMSVoltageIsolationandaLow-ResistanceCurrentConductorACS7123AllegroMicroSystems,Inc.115NortheastCutoffWorcester,Massachusetts01615-0036U.S.A.1.508.853.5000;(Pin8)(Pin7)VIOUTRF(INT)GND(Pin5)FILTER(Pin6)DynamicOffsetCancellationIP+(Pin1)IP+(Pin2)IP−(Pin3)IP−(Pin4)SenseTrimSignalRecoverySenseTemperatureCoefficientTrim0AmpereOffsetAdjustHallCurrentDrive+5VIP+IP+IP–IP–VCCVIOUTFILTERGND12348765TerminalListTableNumberNameDescription1and2IP+Terminalsforcurrentbeingsensed;fusedinternally3and4IP–Terminalsforcurrentbeingsensed;fusedinternally5GNDSignalgroundterminal6FILTERTerminalforexternalcapacitorthatsetsbandwidth7VIOUTAnalogoutputsignal8VCCDevicepowersupplyterminalFunctionalBlockDiagramPin-outDiagramFullyIntegrated,HallEffect-BasedLinearCurrentSensorwith2.1kVRMSVoltageIsolationandaLow-ResistanceCurrentConductorACS7124AllegroMicroSystems,Inc.1