TI TPS7A30xx超低噪音负电压线性电源转换方案

TITPS7A30xx超低噪音负电压线性电源转换方案关键词：电源管理,DC/DC转换器,TI公司的TPS7A30xx是-36V/-200mA超低噪音负电压线性电源稳压器,具有CMOS逻辑电平兼容的使能引脚和电容可编程的软起动功能,内置了限流和热关断保护,输入电压-3V到-36V,可调输出电压从-1.18V到-33V,最大输出电流200mA,100mA的压降为216mV,20Hz-20kHz的噪音为14mVRMS,120Hz时的PSRR为72dB,主要用在运放,DAC,ADC和其它高精度模拟电路,音频,测试和测量,TX,RX和PA电路,基站和通信基础设备以及-12V和-24V工业总线.本文介绍了TPS7A30xx主要特性,功能方框图和几种典型应用电路,TPS7A30-49EVM-567评估板电路图和材料清单.TPS7A30xx:–36V,–200mA,Ultralow-Noise,NegativeLINEARREGULATORTheTPS7A30xxseriesofdevicesarenegative,high-voltage(–36V),ultralow-noise(15.1mVRMS,72dBPSRR)linearregulatorscapableofsourcingamaximumloadof200mA.TheselinearregulatorsincludeaCMOSlogic-level-compatibleenablepinandcapacitor-programmablesoft-startfunctionthatallowsforcustomizedpower-managementschemes.Otherfeaturesavailableincludebuilt-incurrentlimitandthermalshutdownprotectiontosafeguardthedeviceandsystemduringfaultconditions.TheTPS7A30xxfamilyisdesignedusingbipolartechnology,andisidealforhigh-accuracy,high-precisioninstrumentationapplicationswherecleanvoltagerailsarecriticaltomaximizesystemperformance.Thisdesignmakesitanexcellentchoicetopoweroperationalamplifiers,analog-to-digitalconverters(ADCs),digital-to-analogconverters(DACs),andotherhigh-performanceanalogcircuitry.Inaddition,theTPS7A30xxfamilyoflinearregulatorsissuitableforpostdc/dcconverterregulation.Byfilteringouttheoutputvoltagerippleinherenttodc/dcswitchingconversion,maximumsystemperformanceisprovidedinsensitiveinstrumentation,testandmeasurement,audio,andRFapplications.TPS7A30xx主要特性:•InputVoltageRange:–3Vto–36V•Noise:–14mVRMS(20Hzto20kHz)–15.1mVRMS(10Hzto100kHz)•Power-SupplyRippleRejection:–72dB(120Hz)–≥55dB(10Hzto700kHz)•AdjustableOutput:–1.18Vto–33V•MaximumOutputCurrent:200mA•DropoutVoltage:216mVat100mA•StablewithCeramicCapacitors≥2.2mF•CMOSLogic-Level-CompatibleEnablePin•Built-In,Fixed,Current-LimitandThermalShutdownProtection•AvailableinHighThermalPerformanceMSOP-8PowerPAD™Package•OperatingTempatureRange:–40℃to+125℃TPS7A30xx应用:•SupplyRailsforOpAmps,DACs,ADCs,andOtherHigh-PrecisionAnalogCircuitry•Audio•PostDC/DCConverterRegulationandRippleFiltering•TestandMeasurement•RX,TX,andPACircuitry•IndustrialInstrumention•BaseStationsandTelecomInfrastrucureTypicalApplication•–12Vand–24VIndustrialBuses图1.TPS7A30xx功能方框图图2.TPS7A3001应用电路(1):最大化PSRR性能和最小化RMS噪音图3.TPS7A3001应用电路(2):最大化AC性能图4.TPS7A3001DC/DC转换器:高性能的模拟电路TPS7A30-49EVM-567评估板TheTPS7A30-49EVM-567isafullyassembledandtestedcircuitforevaluatingtheTPS7A3001andTPS7A4901low-dropoutlinearregulatorsintheDGN(3mmx5mmMSOP-8)package.TheTPS7A30-49EVM-567includestwoindependentcircuitswithoutputsof-15Vand+15V,respectively.Theseindependentcircuitsresideonthesamemoduletofacilitateevaluationofsplitrailapplications.TheTexasInstrumentsTPS7A30-49EVM-567EVMhelpsdesignersevaluatetheoperationandperformanceoftheTPS7A3001and/ortheTPS7A4901LDOregulatorforpossibleuseintheircircuitapplications.ThisparticularEVMconfigurationispreconfiguredtooutput–15Vdcand+15Vdcforeaseofdemonstrationincertainstandardindustrialapplications,e.g.,requiringpositiveandnegativevoltagestopoweranoperationalamplifier-based,signal-conditioningcircuitry.Alternatively,eachLDOchannelcanbeadjustedindividuallytoanyoutputvoltagebetween1.2Vand33V(negativeandpositive,respectively)asrequiredbyonlychangingaresistorvalueinaccordancewiththegivenequation.TheTPS7A3001cansupplyupto200-mA-ratedloadcurrentandtheTPS7A4901cansupplyupto150mAeachusingtheMSOP-8,PowerPAD™package.BothcircuitshavebeenoptimizedforacperformanceincludingPSRRandloadtransientresponseusingcapacitorsratedoverthefullvoltagerangeofeachregulator.AO-Electronics傲壹电子官网：中文网：评估板材料清单(BOM):