Hi all
A flyback converter is designed with an input of 10Vdc~85Vdc and an output of 5V/3A.
Transformer Pri:Sec:Aux = 30:4:11
Encountered the following problem:
1. The Vaux voltage will increase as the load becomes larger, causing the Vaux voltage to be too high, which is different from the calculated setting value of about 14V.
2. When the Main MFET is turned off, a Ring will be generated before entering DCM. How can I solve this problem? Attempts to improve the snubber have no effect.
CH1 :Main MFET Vds
Ch2 : Vaux
Ch3 : Gate
Ch4 : V_snubber
