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VishaySiC4146A降压电源稳压方案关键词：电源管理,DC／DC转换器Vishay公司的SiC414是集成了5V/200mALDO的6A降压电源稳压器,开关频率高达1MHz,全部采用陶瓷电容.连续输出电流达6A,效率大于95%,内部软起动和软关断,主要用在笔记本电脑,台式电脑和服务器,数字HDTV和消费类电子,网络和通信设备,打印机,DSL和STB,嵌入式应用和点负载电源.本文介绍了SiC414主要特性,功能方框图,典型应用电路图和SiC414评估板电路图以及材料清单(BOM).TheVishaySiliconixSiC414isanadvancedstand-alonesynchronousbuckregulatorfeaturingintegratedpowerMOSFETs,bootstrapdiode,andaninternal5VLDOinaspace-savingMLPQ4x4-28pinpackage.TheSiC414iscapableofoperatingwithallceramicsolutionsandswitchingfrequenciesupto1MHz.Theprogrammablefrequency,synchronousoperationandselectablepower-saveallowoperationathighefficiencyacrossthefullrangeofloadcurrent.TheinternalLDOmaybeusedtosupply5Vforthegatedrivecircuitsoritmaybebypassedwithanexternal5Vforoptimumefficiencyandusedtodriveexternaln-channelMOSFETsorotherloads.Additionalfeaturesincludecycle-by-cyclecurrentlimit,voltagesoftstart,under-voltageprotection,programmableover-currentprotection,softshutdownandselectablepower-save.TheVishaySiliconixSiC414alsoprovidesanenableinputandapowergoodoutput.SiC414主要特性:•Highefficiency95%•6Acontinuousoutputcurrentcapability•Integratedbootstrapswitch•Integrated5V/200mALDOwithbypasslogic•Temperaturecompensatedcurrentlimit•Pseudofixed-frequencyadaptiveon-timecontrol•Allceramicsolutionenabled•ProgrammableinputUVLOthreshold•IndependentenablepinforswitcherandLDO•Selectableultra-sonicpower-savemode•Internalsoft-startandsoft-shutdown•1%internalreferencevoltage•Powergoodoutputandovervoltageprotection•Halogen-freeaccordingtoIEC61249-2-21definition•ComplianttoRoHSdirective2002/95/ECSiC414应用:•Notebook,desktopandservercomputers•DigitalHDTVanddigitalconsumerapplications•Networkingandtelecommunicationequipment•Printers,DSLandSTBapplications•Embeddedapplications•Pointofloadpowersupplies图1.SiC414功能方框图图2.SiC414典型应用电路图图3.SiC414评估板电路图SiC414评估板材料清单(BOM):AO-Electronics傲壹电子官网：中文网：布局图(顶层)