TITPS56221高效大电流25A直流电源解决方案

TITPS56221高效大电流25A直流电源解决方案关键词：电源管理,DC/DC转换器,TI公司的TPS56221是高效大电流同步降压直流转换器,工作电压4.5V-14V,输出电压低至0.6V,负载电流高达25A.集成的NexFET™功率MOSFET使得占位面积小和容易使用.固定频率选择:300kHz,500kHz和1MHz,可编程软起动,600mV基准电压精度1%,高边和低边MOSFETRDS(on)检测,主要用在POL电源模块,电信和网络设备用的高密度DC/DC转换器.本文介绍了TPS56221主要特性,功能方框图,简化应用电路图和TPS56221EVM-579评估模块主要特性,电路图以及材料清单,元件布局图.TPS56221isahigh-efficiencyandhigh-currentsynchronousbuckconverterdesignedtooperatefromasupplybetween4.5Vand14V.Thedeviceiscapableofproducinganoutputvoltageaslowas0.6Vatloadsupto25A.IntegratedNexFET™PowerMOSFETsprovideasmallfootprintandeaseofuse.Thedeviceimplementsavoltage-modecontrolwithvoltagefeed-forwardcompensationthatrespondsinstantlytoinputvoltagechange.TPS56221isavailableinathermallyenhanced22-pinPQFN(DQP)PowerPAD™package.Thedeviceoffersdesignflexibilitywithavarietyofuserprogrammablefunctions,includingsoft-start,overcurrentprotection(OCP)levels,andloopcompensation.TPS56221主要特性:4.5-Vto14-VInputVoltageRangeIncorporatesPowerBlockTechnologyUpto25-AOutputCurrentFixedFrequencyOptionsof300kHz,500kHzand1MHzHigh-SideandLow-SideMOSFETRDS(on)SensingProgrammableSoft-Start600-mVReferenceVoltagewith1%AccuracyVoltageModeControlwithFeed-ForwardSupportsPre-BiasedOutputThermalShutdown22-Pin5mmx6mmPQFNPowerPADPackageTPS56221主要应用:Point-of-Load(POL)PowerModulesHighDensityDC-DCConvertersforTelecomandNetworkingApplications图1.TPS56221功能方框图图2.TPS56221简化应用电路图TPS56221EVM-579评估模块TheTexasInstrumentsTPS56221EVM-579evaluationmodule(EVM)isasynchronousbuckconverterprovidingafixed1.2-Voutputatupto25Afroma12-Vinputbus.TheEVMisdesignedtostartupfromasinglesupply;so,noadditionalbiasvoltageisrequiredforstart-up.ThemoduleusestheTPS56221High-Current,SynchronousBuckConverterwithintegratedMOSFETs.TheTPS56221integratesTI’shigh-performancecontrollertechnologywithTI’sindustry-leadingMOSFETtechnologyinastandardQFNpackagetomeetthedemandsofmodern,high-current,space-constrainedapplications.TPS56221EVM-579评估模块应用:•High-current,low-voltageFPGAormicrocontrollercoresupplies•High-current,point-of-loadmodules•Telecommunicationsequipment•ComputerperipheralsTPS56221EVM-579评估模块主要特性:•8-Vto14-Vinputvoltagerating•1.2-V±2%outputvoltagerating•Lessthan400-mm2activePCBarea(excludingbulkinputandoutputcapacitors)•25-Asteady-stateloadcurrent•500-kHzswitchingfrequency•SimpleaccesstoICfeaturesincludingPowerGood,Enable,Soft-Start,andErrorAmplifier•Convenienttestpointsforsimple,non-invasivemeasurementsofconverterperformance.TPS56221EVM-579评估模块电性能表:图3.TPS56221EVM-579评估模块电路图TPS56221EVM-579评估模块材清单(BOM):AO-Electronics傲壹电子官网：中文网：评估模块元件布局图(顶视图)