电磁炉常用芯片资料viper12a

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1、VIPer12ADIP®VIPer12ASLOWPOWEROFFLINESMPSPRIMARYSWITCHERTYPICALPOWERCAPABILITYMainstypeSO-8DIP8European8W13W(195-265Vac)US/WiderangeSO-8DIP-85W8W(85-265Vac)ORDERCODESPACKAGETUBET&RnFIXED60KHZSWITCHINGFREQUENCYSO-8VIPer12ASVIPer12AS13TRn9VTO38VWIDERANGEVDDVOLTAGEDIP-8VIPer12ADIPnCURRENTMODECONTROLnAUX

2、ILIARYUNDERVOLTAGELOCKOUTMOSFETonthesamesiliconchip.TypicalWITHHYSTERESISapplicationscoverofflinepowersuppliesforbatterychargeradapters,standbypowersuppliesnHIGHVOLTAGESTARTUPCURRENTforTVormonitors,auxiliarysuppliesformotorSOURCEcontrol,etc.TheinternalcontrolcircuitoffersthenOVERTEMPERATURE,OVERCURR

3、ENTANDfollowingbenefits:OVERVOLTAGEPROTECTIONWITH–LargeinputvoltagerangeontheVDDpinAUTORESTARTaccommodateschangesinauxiliarysupplyvoltage.ThisfeatureiswelladaptedtobatteryDESCRIPTIONchargeradapterconfigurations.TheVIPer12Acombinesadedicatedcurrentmode–Automaticburstmodeinlowloadcondition.PWMcontroll

4、erwithahighvoltagePower–Overvoltageprotectioninhiccupmode.BLOCKDIAGRAMDRAINON/OFF60kHzREGULATOROSCILLATORPWMINTERNALSLATCHSUPPLYOVERTEMP.R1FFQDETECTORR2R3R4_VDD+BLANKING8/14.5V+_0.23VOVERVOLTAGERLATCH230W+SFFQ_42V1kWFBSOURCENovember20031/15VIPer12ADIP/VIPer12ASPINFUNCTIONNameFunctionPowersupplyofthe

5、controlcircuits.Alsoprovidesachargingcurrentduringstartupthankstoahighvoltagecurrentsourceconnectedtothedrain.Forthispurpose,anhysteresiscomparatormonitorstheVDDvoltageandprovidestwothresholds:VDD-VDDon:Voltagevalue(typically14.5V)atwhichthedevicestartsswitchingandturnsoffthestartupcurrentsource.-VD

6、Doff:Voltagevalue(typically8V)atwhichthedevicestopsswitchingandturnsonthestartupcurrentsource.SOURCEPowerMOSFETsourceandcircuitgroundreference.PowerMOSFETdrain.AlsousedbytheinternalhighvoltagecurrentsourceduringstartupphaseforDRAINchargingtheexternalVDDcapacitor.Feedbackinput.Theusefulvoltagerangeex

7、tendsfrom0Vto1V,anddefinesthepeakdrainMOSFETFBcurrent.Thecurrentlimitation,whichcorrespondstothemaximumdraincurrent,isobtainedforaFBpinshortedtotheSOURCEpin.CURRENTANDVOLTAGECONVENTIONSIIDDDVDDDRAINIF