Other Parts Discussed in Thread: UCC28600, PMP9208, PMP
Hello...
I have designed a power supply using UCC28633 and developed the board. My design was based on UCC28633 Excel Design Calculator and WEBENCH design tool. Unfortunately, when I assembled the board, the board behaves like dead. The DRV pulse comes at 1 Hz frequency. The transformer winding ratio Np:Naux:Ns is 47:6:6. The Core used here is ETD 19/16/10 with Al value of 122 nH/T2. Lpri is 270uH. The MOSFET we are using is STB13N60M2 which is similar to the MOSFET suggested in the application note. The Bias winding i.e. MAG gives me 1.8V. It seems we are missing something. Please look at the schematic attached herewith to help us solving the issue. The output voltage what we get is also like 1.8V. Everything here I have mentioned was in no load condition.
Regards,
Sambuddha13V 65W AUX.pdf