剛測試一款用OB2201的部分參數,是12V/3A的1,115V/60Hz,不同負載時的振盪頻率,3A58.8KHZ  2.25A70.4KHz1.5A92.6KHz0.75A58.8KHz0A162Hz    230V/50Hz,不同負載時的振盪頻率,3A86.2KHZ2.25A98KHz1.5A90.9KHz0.75A41.3KHz0A180Hz2.變壓器感量0.9mH3.占空比90V/50Hz    9.2/17.2=0.534                  264v/50Hz  2.4/11=0.218按以上的測試結果來看,占空比來的還是比較大的,不過振盪頻率在高壓時比較高,不知道傳導如何?要確認下.

ConformingDesignIdeasfromPowerIntegrationsThefollowingtableshowsPowerIntegrationsDesignIdeasthatmeetthespec.DocumentDeviceUsedPowerOutput(W)Efficiency(4PointsAverage)*CEC2008ENERGYSTAR2.0‡DI-85  LNK564PN264.8%56.2%61%DI-113TNY274PN571.5%59.9%68%DI-115TNY376PN7.5/13Pk77.7%68.1%75%DI-132LNK564DN1.7564.0%55.0%60%DI-143TOP258MN20/80Pk85%77%81%DI-144TOP258PN50/70Pk89.9%84%87%*Theactualmeasurementoftheaverageefficiencyofthedesignideaatthe4testpointsofload:25%,50%,75%and100%,ascalledforbyCECandENERGYSTARspecs†TheCaliforniaEnergyCommissionstandardthatwillbecomeeffectiveinJuly,2008Note:DI-85(2W,64.8%)andDI-132(1.75W,64%)cannotmeetEPS2.0.ThequaotedEPS2.0speciswrong.ESP2.0for1.75Wand2WinDI-85andDI-132shouldbe66.5%and65.7%respectively.Theyare1.5%or2%lessthanthespec.

Thisistheearlistoneinthisfield.someothercompaniesfollowedthedirectionsandhavesameICs(3-pin).

ThefisrtemmitdriveICfromTyco119521177490076.pdf

theoriginaldocument1176239160.pdf

itisexactlyBITEK3105.

YoucanaskOBdistyandsalesifyouneed.AllOBproductsdohaveOBownPatentsandsomearealreadyissuedbyUSpatentoffice.YouwillfindoutthatallOBprodutsdonotinfringeanyotherpatentsafteryoustudyit.ThereasonofnotopeningthedatasheettopublicisthattherearemanyICcompaniesinChinathatcopyeverythingfromICtodatasheet.Ifyousearchyoucanfindoutthat,forexample,allSG'sICanddatasheetsarecopiedbyacompanyinChengdu.ThisiswhyOBdoeswanttoreleasethedatasheettopublic.OBwantstoprotectitself,anddoesnotwanttospendtimetofightwiththoseguys.

VDDvoltageof15Vislowerthanstartupvolatge,pleaserefertodatasheet.Suggestion:VDD>17.5VforDCmeasurement.PleaseaskOBFAEforhelpifyouhaveanyquestions.

SGdoesnothavePWMICforforward.