供应RICHTEK品牌 RT - GB 原装现货联系QQ 零 零
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Likeanylow-dropoutregulator,theexternalcapacitorsusedwiththeRT mustbecarefullyselectedforregulatorstabilityand_performance.Usingacapacitorwhosevalueis> μFontheRT inputand_theamountofcapacitancecanbeincreasedwithoutlimit.Theinputcapacitormustbelocatedadistanceofnotmorethan零. inchfromtheinputpinoftheICand_returnedtoacleananalogground.Anygoodqualityceramicortantalumcanbeusedforthiscapacitor.Thecapacitorwithlargervalueand_lowerESR(equivalentseriesresistance)providesbetterPSRRand_line-transientresponse.TheoutputcapacitormustmeetbothrequirementsforminimumamountofcapacitanceandESRinallLDOsapplication.TheRT isdesignedspecificallytoworkwithlowESRceramicoutputcapacitorinspace-savingand_performanceconsideration.Usingaceramiccapacitorwhosevalueisatleast μFwithESRis> mΩontheRT outputensuresstability.TheRT stillworkswellwithoutputcapacitorofothertypesduetothewidestableESRrange.Figure showsthecurvesofallowableESRrangeasafunctionofloadcurrentforvariousoutputcapacitorvalues.Outputcapacitoroflargercapacitancecanreducenoiseandimproveloadtransientresponse,stability,and_PSRR.Theoutputcapacitorshouldbelocatednotmorethan零. inchfromtheVOUTpinoftheRT and_returnedtoacleananalogground.Figure BypassCapacitorand_LowNoiseConnectinga nFbetweentheBPpinand_GNDpinsignificantlyreducesnoi ntheregulatoroutput,itiscriticalthatthecapacitorconnectionbetweentheBPpinand_GNDpinbedirectand_PCBtracesshouldbeasshortaspossible.Thereisarelationshipbetweenthebypasscapacitorvalueand_theLDOregulatorturnontime.DCleakageonthispincanaffecttheLDOregulatoroutputnoiseand_voltageregulationperformance.EnableFunctionTheRT featuresanLDOregulatorenable/disablefunction.ToassuretheLDOregulatorwillswitchon,桥检车租赁快讯网内部人士获悉,theENturnoncontrollevelmustbegreaterthan . volts.TheLDOregulatorwillgointotheshutdownmodewhenthevoltageontheENpinfallsbelow零. volts.Fortoprotectingthesystem,theRT haveaquick-dischargefunction.Iftheenablefunctionisnotneededinaspecificapplication,itmaybetiedtoVINtokeeptheLDOregulatorinacontinuouslyonstate.ThermalConsiderationsThermalprotectionlimitspowerdissipationinRT .Whentheoperationjunctiontemperatureexceeds °C,theOTPcircuitstartsthethermalshutdownfunctionturnthepasselementoff.Thepasselementturnonagainafterthejunctiontemperaturecoolsby 零°C.Forcontinueoperation,donotexceedabsolutemaximumoperationjunctiontemperature °C.Thepowerdissipationdefinitionindeviceis:PD=(VIN?VOUT)xIOUT+VINxIQThemaximumpowerdissipationdependsonthethermalresistanceofICpackage,PCBlayout,therateofsurroundingsairflowand_temperaturedifferencebetweenjunctiontoambient.Themaximumpowerdissipationcanbecalculatedbyfollowingformula:PD(MAX)=(TJ(MAX)?TA)/θJAWhereTJ(MAX)isthemaximumoperationjunctiontemperature °C,桥检车租赁快讯网消息人士称,TAistheambienttemperatureandtheθJAisthejunctiontoambientthermalresistanc
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