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用平面型磁芯设计25瓦直流变换器25WattDCDCconverterusingPlanarCoretechnicalnotePhilipsMagneticProducts25WattDC/DCconverterusingintegratedPlanarMagneticsPhilipsComponents25WattDC/DCconverterusingintegratedPlanarMagneticsContentsIntroductionConverterdescriptionConverterspecificationPerformanceoftheconverterDesignofplanarmagneticsPCBlayoutCircuitdiagramComponentslist23446811121PhilipsMagneticProducts25WattDC/DCconverterusingintegratedPlanarMagnetics(designedincooperationwithPEITechnologies,Ireland)IntroductionPlanarmagneticsareanattractivealternativetoconventionalcoreshapeswhenalowprofileofmagneticdevicesisrequired.Basicallythisisaconstructionmethodofinductivecomponentswhosewindingsarefabricatedusingprintedcircuittracksorcopperstampingssepa……