PowerintPKS607YN50W音頻放大器電源設(shè)計方案

PowerintPKS607YN50W音頻放大器電源設(shè)計方案

Powerint公司的PKS607YN是PeakSwitch系列器件,能滿足高峰值/連續(xù)功率比的應(yīng)用需求.PeakSwitch系列集成了700V功率MOSFET,振蕩器,用于起動的高壓開關(guān)電流源,限流和熱關(guān)斷.此外,還包括自動重起,火線欠壓檢測和頻率抖動等功能.PKS603-607具有極好的能效,輸入電壓265VAC是無負(fù)載的功耗僅為200mW,滿足CaliforniaEnergyCommission(CEC),ENERGYSTAR和EU的規(guī)范,主要應(yīng)用于噴墨打印機(jī),數(shù)據(jù)存儲,音頻放大器和DC馬達(dá)驅(qū)動.本文介紹了PeakSwitchPowerint公司的PKS607YN是PeakSwitch系列器件,能滿足高峰值/連續(xù)功率比的應(yīng)用需求.PeakSwitch系列集成了700V功率MOSFET,振蕩器,用于起動的高壓開關(guān)電流源,限流和熱關(guān)斷.此外,還包括自動重起,火線欠壓檢測和頻率抖動等功能.PKS603-607具有極好的能效,輸入電壓265VAC是無負(fù)載的功耗僅為200mW,滿足CaliforniaEnergyCommission(CEC),ENERGYSTAR和EU的規(guī)范,主要應(yīng)用于噴墨打印機(jī),數(shù)據(jù)存儲,音頻放大器和DC馬達(dá)驅(qū)動.本文介紹了PeakSwitch系列PKS603-607的主要特性,功能方框圖,采用PKS606Y的連續(xù)功率32W(峰值功率81W)的通用電壓輸入電源電路圖以及采用PKS607YN連續(xù)輸出功率50W(峰值功率200W)的音頻放大器電源設(shè)計的要點和詳細(xì)電路圖。PeakSwitchisdesignedtoaddressapplicationswithhighpeak-to-continuouspowerratiodemands.Theveryhighswitchingfrequencyduringpeakpowerloadsandexcellentloadtransientresponsereducesystemcostaswellascomponentcountandsize.PeakSwitchincorporatesa700VpowerMOSFET,oscillator,highvoltageswitchedcurrentsourceforstartup,currentlimit,andthermalshutdownontoamonolithicdevice.Inaddition,thesedevicesincorporateauto-restart,lineunder-voltagesenseandfrequencyjittering.AninnovativedesignminimizesaudiofrequencycomponentsinthesimpleON/OFFcontrolschemetopracticallyeliminateaudiblenoisewithstandardvarnishedtransformerconstruction.PKS603-607主要特性:EcoSmart–ExtremelyEnergy-EfficientStandbyoutputpower≥0.6Wfor1Winput(highline)Sleepmodepower≥2.4Wat3Winput(highline)No-loadconsumptionSurpassesCaliforniaEnergyCommission(CEC),ENERGYSTAR,andEUrequirementsPeakSwitchFeaturesReduceSystemCostDeliverspeakpowerofuptothreetimesmaximumcontinuousoutputpower277kHzoperationduringpeakpowersignificantlyreducestransformersizeProgrammablesmartAClinesensingprovideslatchingshutdownduringshortcircuit,overloadandopenloopfaults,andpreventsglitchesduringpowerdownorbrownoutTwoexternalcomponentsresetlatchonACremovalAdaptiveswitchingcycleon-timeextensionincreaseslowlinepeakoutputpower,minimizingbulkcapacitorsizeAdaptivecurrentlimitreducesoutputoverloadpowerFrequencyjitteringreducesEMIfiltercostTightI2ftolerancesandnegligibletemperaturevariationofkeyparameterseasedesignandlowercostAccuratehystereticthermalshutdownwithautomaticrecoveryprovidescompletesystemleveloverloadprotectionandeliminatesneedformanualresetBetterSystemCost/PerformanceoverRCC&DiscreteSimpleON/OFFcontrol–noloopcompensationneededVerylowcomponentcount–higherreliabilityandsinglesideprintedcircuitboardHighbandwidthprovidesfastturnonwithnoovershootandexcellenttransientloadresponsePeakcurrentlimitoperationrejectslinefrequencyrippleBuilt-incurrentlimitandhystereticthermalprotectionPKS603-607應(yīng)用:InkjetprinterDatastorage,audioamplifier,DCmotordrives圖1.PKS603-607功能方框圖圖2.采用PKS606Y的連續(xù)功率32W(峰值功率81W)的通用電壓輸入電源電路圖采用PKS607YN連續(xù)輸出功率50W(峰值功率200W)的音頻放大器電源設(shè)計要點Theuniversalinputpowersupplyhastwomainoutputvoltages,+28Vand-28V,andconsistsoftwoparallelconverters.Eachoutputcandeliver25Wcontinuous,100Wpeak.EachconverterusesaPeakSwitch(PKS607YN)whichshareacommoninputstage.The12Voutputisratedtoprovideanoutputcurrentof333mA.Durationofpeakpoweroutputisthermallylimited,beingdeterminedbyenvironmentandheat-sinking.Commonmodechokes,L1andL2alongwithY-capacitorsC3,C4,C23andC24formthecommonmodeEMIfilter.InductorsL3,L4andL5andcapacitorsC5,C1