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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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LT3071EUFD датащи(PDF) 12 Page - Linear Technology |
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LT3071EUFD датащи(HTML) 12 Page - Linear Technology |
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12 / 28 page  LT3071 3071f pin Functions SENSE (Pin 19):KelvinSenseforOUT.TheSENSEpinis theinvertinginputtotheerroramplifier.Optimumregulation isobtainedwhentheSENSEpinisconnectedtotheOUT pinsoftheregulator.Incriticalapplications,theresistance (RP)ofPCBtracesbetweentheregulatorandtheloadcause smallvoltagedrops,creatingaloadregulationerroratthe pointofload.ConnectingtheSENSEpinattheloadinstead ofdirectlytoOUTeliminatesthisvoltageerror.Figure1 illustratesthisKelvin-Senseconnectionmethod.Notethat thevoltagedropacrosstheexternalPCBtracesaddstothe dropoutvoltageoftheregulator.TheSENSEpininputbias currentdependsontheselectedoutputvoltage.SENSE pininputcurrentvariesfrom50µAtypicallyatVOUT=0.8V to300µAtypicallyatVOUT=1.8V. IMON (Pin 21): Output Current Monitor. The IMON pin sourcesacurrenttypicallyequaltoIOUT/2500or400µA perampofoutputcurrent.Terminatingthispinwitha resistortoGNDproducesavoltageproportionaltoIOUT. Forexample,atIOUT=5A,IMONtypicallysources2mA. Witha1kresistortoGND,thisproduces2V.IfIMONis unused,tiethispintoVBIAS. MARGA (Pin 22):AnalogMargining:Thispinmarginsthe outputvoltageoveracontinuousanalograngeof±10%. TyingthispintoGNDadjustsoutputvoltageby–10%. Drivingthispinto1.2Vadjustsoutputvoltageby+10%.A voltagesourceoravoltageoutputDACisidealfordriving thispin.IftheMARGAfunctionisnotused,eitherfloat thispinorterminatewitha1nFcapacitortoGND. VO0, VO1 and VO2 (Pins 23, 24, 25):OutputVoltageSe- lect.Thesethree-statepinscombinetoselectanominal outputvoltagefrom0.8Vto1.8Vinincrementsof50mV. Outputvoltageislimitedto1.8Vmaximumbyaninternal override of VO1whenVO2=high.Theinputlogiclow thresholdislessthan250mVreferencedtoGNDandthe logic highthresholdisgreaterthanVBIAS–250mV.The rangebetweenthesetwothresholdsassetbyawindow comparatordefinesthelogic Hi-Zstate.SeeTable1inthe ApplicationsInformationsectionthatdefinestheVO2,VO1 andVO0settingsversusVOUT. BIAS (Pin 27):BiasSupply.Thispinsuppliescurrentto theinternalcontrolcircuitryandtheoutputstagedriving thepasstransistor.TheLT3071requiresaminimum2.2µF bypasscapacitorforstabilityandproperoperation.To ensureproperoperation,theBIASvoltagemustsatisfy thefollowingconditions:2.2V≤VBIAS≤3.6VandVBIAS≥ (1.25•VOUT+1V).ForVOUT≤0.95V,theminimumBIAS voltageislimitedto2.2V. EN (Pin 28):Enable.Thispinenables/disablestheoutput deviceonly.Theinternalreferenceandallsupportfunctions areactiveifVBIASisaboveitsUVLOthreshold.Pulling ENlowkeepsthereferencecircuitactive,butdisables theoutputpasstransistorandputstheLT3071intoalow power napmode.DrivetheENpinwitheitheradigitallogic portoranopen-collectorNPNoranopen-drainNMOS terminatedwithapull-upresistortoVBIAS.Thepull-up resistormustbelessthan35ktomeettheVIHcondition oftheENpin.Ifunused,connectENtoBIAS. Figure 1. Kelvin Sense Connection BIAS LT3071 EN IN VO0 VO1 VBIAS VIN VO2 MARGA VIOC SENSE PWRGD OUT IMON RP REF/BYP GND + + RP 3071 F01 LOAD |
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