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canyoushowyourschematic?Itcanbeoneofthefollowingreasons:1.ThePWMdrivingcircuitisnotabletodrivethetransformerwhenonload.2.outputwasconnectedwithchipswhichwassomewhereshort.3.Feedbackcontrol,theresistancevaluemustbecorrect.

Ifthecontrolloopisnotworkingwell,the'gi-gi'willbecreatedalso.checktheinductorortransfomeranditscontrolmetholdandcontrolloop.

outputcapacitorselectionusually,theoutputcapacitorselectionwillbasedontheholduptimeatabout20-40ms.useQ=1/2*CV^2*t(Qistheoutputpower,andtheVistheallowedoperationvolatage)