基于UCC28070的300W PFC高效電源方案設計

本文介紹了UCC28070主要特性，簡化方框圖和功能方框圖，以及采用兩個UCC28070的四相輸出應用框圖，300W交叉PFC預穩(wěn)壓器參考設計主要指標，控制器電路圖和電源電路圖。UCC28070是先進的功率因素修正器件，集成了兩個工作在180度反相的PWM。這種PWM交叉工作能降低輸入和輸出紋波電流，使得導電EMI濾波變得更加容易，成本更低?？删幊坦ぷ黝l率從30kHz到300kHz，有極好的效率和多種保護功能，主要用在高效服務器和臺式PC電源，通信整流器，白色家電和工業(yè)設備。UCC28070主要特性：InterleavedAverageCurrent-ModePWMControlwithInherentCurrentMatchingAdvancedCurrentSynthesizerCurrentSensingforSuperiorEfficiencyHighly-LinearMultiplierOutputwithInternalQuantizedVoltageFeed-ForwardCorrectionforNear-UnityPFProgrammableFrequency(30kHzto300kHzProgrammableMaximumDuty-CycleClampProgrammableFrequencyDitheringRateandMagnitudeforEnhancedEMIReductionMagnitude:3kHzto30kHzRate:Upto30kHzExternalClockSynchronizationCapabilityEnhancedLoadandLineTransientResponsethroughVoltageAmplifierOutputSlew-RateCorrectionProgrammablePeakCurrentLimitingBias-SupplyUVLO,Over-VoltageProtection,Open-LoopDetection,andPFC-EnableMonitoringExternalPFC-DisableInterfaceOpen-CircuitProtectiononVSENSEandVINACpinsProgrammableSoftStart20-LeadTSSOP/SOICPackagesUCC28070應用：High-EfficiencyServerandDesktopPowerSuppliesTelecomRectifiersWhiteGoodsandIndustrialEquipment圖1。UCC28070簡化方框圖圖2。UCC28070功能方框圖圖3。采用兩個UCC28070的四相輸出應用框圖UCC28070300W交叉PFC預穩(wěn)壓器參考設計UCC28070300-WInterleavedPFCPre-RegulatorDesignReviewInhigherpowerapplicationstoutilizethefulllinepowerandreducelinecurrentharmonicsPFCPre-regulatorsaregenerallyrequired.InthesehighpowerapplicationsinterleavingPFCstagescanreduceinductorvolumeandreduceinputandoutputcapacitorripplecurrent.Thisresultsinsmalleroverallmagneticvolumeandfiltercapacitorvolumeincreasingtheconvertersoverallpowerdensity.Thisismadepossiblethroughdistributingthepowerovertwointerleavedboostconvertersandtheinductorripplecurrentcancellationthatoccurswithinterleaving,reference[5].Thisapplicationnotewillreviewthedesignofa300Wtwo-phaseinterleavedpowerfactorcorrected(PFCpre-regulator.ThispowerconverterachievesPFCwiththeuseoftheUCC28070interl