liujiehit2000：
PIengineer,Ihavemadethesameexperimentwithoutstackfettopology.Thentheefficiencyisthesamewithbeforeresult.TherebyIthinkmaybetheissueisnottheIC.UntilnowImakesomeotherimprovmentonthat,andtheefficiencyisabout68,55%.Itislittlemorehighterthanbefore.NowIwillattachmenttheschematic,andpleasehelpmeimprovethat.Ihopethatefficiencycanreachover70%at750mWoutputpower.andinputvoltageisfrom300-600Voutputpowerisabout750mW.132311190300361.pdf