James Bond

Hi, thanks by you reply but this ins't the problem, the circuit works with 10pF. I found how fixate this, this is a setting problem. Original configuration was: System -> Set simulations options -> Tolerances (left down corner) -> Default Settings. I changed to: System -> Set simulations options -> Tolerances (left down corner) -> "Settings for better convergence" (and load it). Now work fine. Best regards.

Hi everyone Sorry my bad. There go the schematic and the error. I joined the Proteus file too, so you can test it if you have Proteus. Best regards P.S:: Can i change TLE2141 by MC34071 without any problem? My goal is controll the PSU using arduino, but need put its to work first Final.pdsprj