基于NCP1014芯片的开关电源设计

:2007-03-22:(1962-),,:1671-7333(2007)02-0091-03NCP1014席惠,马立华(,200235):NCP101X系列芯片是低待机功耗离线开关电源的自给电流式单片转换器,它将固定频率电流模式PWM控制器和700V的MOSFET集成在一块芯片上它还具有软起动频率抖动短路电流保护跳周期最大峰值电流调整和动态自供电功能本文介绍一种基于低待机功耗NCP1014芯片的开关电源设计,实验证明它具有外围电路简单体积小转换效率高和成本低等特点:NCP1014;开关电源;单片集成转换芯片:TN15:ADesignofSwitchModePowerSupplyBasedonNCP1014XIhui,MALi-hua(SchoolofMechanicalandAutomationEngineering,ShanghaiInstituteofTechnology,Shanghai200235,China)Abstract:TheNCP101Xseriesbelongtosel-fsuppliedmonolithicswitcherforlowstandbypowerofflineswitchmodepowersupply.Itintegratesafixed-frequencycurrentmodePWMcontrollerand700vMOS-FET.Ithasmanyfunctions:soft-start,frequencyjittering,short-circuitprotection,skip-supply.Thispa-perintroducesthedesignofswitchmodepowersupplybasedonlowstandbypowerNCP1014.Theexper-imentsindicatethatthisswitchmodepowersupply(SMPS)hassimplisityofperipheralcircuit,smallsize,highswitchesefficiencyandlow-cost.Keywords:NCP1014;switchmodepowersupply;monolithicintegratedswitcher,,,,,,290W,(OnSemiconductor)NCP101411,7220076JOURNALOFSHANGHAIINSTITUTEOFTECHNOLOGYVol.7No.2Jun.2007,,DC/DC,,1DC/DC,,;,,,,(PWM),,2NCP101X(PWM)(OnSemiconductor)NCP101X700VMOSFET(SkipCy-cle),(SkipCycle)NCP101X5:NCP1010NCP1011NCP1012NCP1013NCP1014MOSFETRDSonIpeak,1:SOT223PDIP7PDIP7,2100~250VacNCP101X67%1NCP101XNCP1010NCP1011NCP1012NCP1013NCP1014RDSon/82211Ipeak/mA100250250350450Freq/kHz65100130651001306510013065100130651002(SOT-223)(PDIP-7,PDIP-7/GullWing)11Vcc,Vcc,1Vcc2NC3NC24FB,35DrainMOSFET-----7NC48GNDIC-3NCP1014AC/DC2DC/DC,(DCM)NCP1014,9272AC/DC3.1EMIEMIC1,,,3.2C2C3L1F,3.3MOSFET,(),,MOSFET,,(TVS)D1(SRD)D2TVSSRD3.4,,,(EMC),,,100kHz;EE19,,N1=Ui/(4.44@B@f@Afe@10-4)N2=Uo(1+$U%)/(4.44@B@f@Afe@10-4):$U%,%;1%;B,T;f,Hz;Afe:,cm2;Afe=@@3.5D4C7C8L2F,Uo(:NCP101467%)3.6TL431,PC817R1R2R3R4,Ic3.7Uo,R1R2TL431,K,IFIc,NCP1014,,(下转第98页)932,:NCP10143@3-2@3-2=1,n=3(gaH),1,(a)1,na,,nH:nH=Zana(Zb+Za)(3)Ò,na=0,F=3n-2PL-PH=3@4-2@4-3=1,n=4(12gH),1,(1)1,n1,,nH:nH=-Z1Zbn1Z2(Zb+Za),,(nH),,;,(,)(,,);,,,,,4,FXS,,,,,,,,:[1],.()[M]:,2001.[2].[M].:,1997.[3],.[M].:,2002.[4],,.[M].:,2001.[5].[J].##,2003,(3):42-43.[6],,.[M].:,2001.[7].[M].:,2000.(上接第93页)45V,12W,?0.2%,[50mV,80%NCP1014,,,:[1]AbrahamI.Pressman.[M]..:,2005.[2].[M].:,2005.[3],,,.()[M].:,2006.[4].[M].:,2006.[5]A6.0W/12WUniversalMainsAdapterwiththeNCP101X[EB/OL].http:M[6]Sel-fSuppliedMonolithicSwitcherforLowStandbypowerOfflineSMPW[EB/OL].http:M