25W DC-DC converter using integrated planar transformers

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1、technicalnotePhilipsMagneticProducts25WattDC/DCconverterusingintegratedPlanarMagneticsPhilipsComponents25WattDC/DCconverterusingintegratedPlanarMagneticsContentsIntroduction2Converterdescription3Converterspecification4Performanceoftheconverter4Designofplanarmagnetics6PCBlayout8Circuitdiagram11Com

2、ponentslist121PhilipsMagneticProducts25WattDC/DCconverterusingintegratedPlanarMagnetics(designedincooperationwithPEITechnologies,Ireland)IntroductionPlanarmagneticsareanattractivealternativetoTheaimofthisdemonstrationboardistodemonstrateconventionalcoreshapeswhenalowprofileofmagneticthecapability

3、ofPhilips’planarEcores(seeDatadevicesisrequired.BasicallythisisaconstructionmethodHandbookMA01).Oneofthesecoresisusedintheofinductivecomponentswhosewindingsarefabricateddesignofahighfrequency25WDC/DCconverter.A6usingprintedcircuittracksorcopperstampingsseparatedlayerPCBisusedtofacilitatetheintegr

4、ationofthebyinsulatingsheets,orconstructedfrommultilayercircuittransformerandoutputinductorwindingsintotheboards.ThesewindingsareplacedinlowprofileferritemultilayerPCBstructure.EE-orE/PLT-corecombinations.PlanardevicescanbeTheboarddemonstratestheadvantagesoverstandardwireconstructedasstandaloneco

5、mponentsorintegratedintowoundsolutionsintermsofcost,size,simplicityandamultilayerboardwithslotscuttoaccepttheferriteE-reliability.Itwillalsoshowthattheelectricalperformancecore(fig.1).oftheconverterisexcellent.2PhilipsMagneticProductsFeaturessuchasinputfiltering,outputvoltageandlongAt48Vinput,syn

6、chronousrectificationwillincreasethetermshortcircuitprotectionhavebeenomittedfromtheefficiencybyapproximately3%to6%dependingonthedesignastheuseofplanarmagneticsdoesnothaveanRds(on)oftheMOSFETSusedandtheswitchingimpactonthesefeatures.frequency.LowRds(on)MOSFETSincreaseefficiencybutaremoreexpensive

7、.Thechosentopologyistheforwardconverterwithresonantreset.AbasicdescriptionoftheoperationofaIncreasedfrequencywillreducetheefficiencyoftheforwardconvertercanbefoundinmosttextbooksonsynchronousrectifiersduetothechargingo