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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) 17 Page - Linear Technology |
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LT3071EUFD датащи(HTML) 17 Page - Linear Technology |
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17 / 28 page  LT3071 3071f ApplicAtions inFormAtion Figure 2. VIOC Control Block Diagram PWRGD—Power Good PWRGDpinisanopen-drainNMOSdigitaloutputthat activelypullslowifanyoneofthesefaultmodesisde- tected: • VOUTislessthan90%ofVOUT(NOMINAL)ontherising edgeofVOUT. • VOUTdropsbelow85%ofVOUT(NOMINAL)formorethan 25µs. • VBIASislessthanitsundervoltagelockoutthreshold. • TheOUT-to-INreverse-currentdetectoractivates. • Junctiontemperatureexceeds145°Ctypically.* *Thejunctiontemperaturedetectorisanearlywarning indicatorthattripsapproximately20°Cbeforethermal shutdownengages. Stability and Output Capacitance TheLT3071’sfeedbacklooprequiresanoutputcapacitor forstability.ChooseCOUTcarefullyandmountitinclose proximitytotheLT3071’sOUTandGNDpins.Includewide routingplanesforOUTandGNDtominimizeinductance. Ifpossible,mounttheregulatorimmediatelyadjacentto theapplicationloadtominimizedistributedinductance for optimal load transient performance. Point-of-Load applications present the best case layout scenario for extractingfullLT3071performance. LowESR,X5RorX7Rceramicchipcapacitorsarethe LTCrecommendedchoiceforstabilizingtheLT3071.Ad- ditionalbulkcapacitorsdistributedbeyondtheimmediate decouplingcapacitorsareacceptableastheirparasiticESL andESR,combinedwiththedistributedPCBinductance isolatesthemfromtheprimarycompensationpoleprovided bythelocalsurfacemountceramiccapacitors. TheLT3071requiresaminimumoutputcapacitanceof 15µFforstability.LTCstronglyrecommendsthattheoutput capacitornetworkconsistofseverallowvalueceramic capacitorsinparallel. Why Do Multiple, Small-Value Output Capacitors Connected in Parallel Work Better? TheLT3071’sunity-gainbandwidthwithCOUTof15µFis about1MHzatitsfull-loadcurrentof5A.Surfacemounted MLCC capacitors have a self-resonance frequency of fR=1/(2π√LC),whichmustbepushedtoafrequencyhigher thantheregulatorbandwidth.StandardMLCCcapacitors areacceptable.Tokeeptheresonantfrequencygreater than1MHz,theproduct1/(2π√LC)mustbegreaterthan 1MHz.Atthisbandwidth,PCBviascanaddsignificant inductance,thusthefundamentaldecouplingcapacitors mustbemountedonthesameplaneastheLT3071. REFERENCE LT3071 IN VREF VOUT + 300mV OUT VIOC 3071 F02 LOAD + – PWM SWITCHING REGULATOR REF FB ITH |
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