Hi all,
I'm designing a 12V/2A smps using an ucc28730 and a former flyback transformer.
parameters are :
Vin min : 150V
Rs1 : 100k
Rs2 : 56K +10k var
Rcs :0.5R
Lp : 750uH
Np : 70
Ns : 9
Na :8
at 230V, it works but when there is no load, output voltage slowly increase up to the OVP (14V ) and the IC restart, reaches 12V , increases slowly, and so on....
ipp =0.5A and Fsw is roughly 300Hz (why not 32Hz ???)
I have increased Rcs to 1ohm to decrease energy transfered and now it works but output current is limited to 1.25A.
What can I check / change to make it work up to 2A ?
BR
