smps design forum using uc3845
Thank you for your response.
Basically i don't have oscilloscope. Finaly i have replaced the BJT with Mosfet 2SK727 and fix the problem. I think Vceo of MJE13007 is not sufficient for this application. Now the problem related with the stability fo the system. The o/p voltage of the SMPS is very unstable.
I am new in SMPS system. I have only theoretical idea (no practical). I have made the same rating SMPS with ST Viper22 PWM controller and found excellent result. But i want to built SMPS only with discreet PWM current mode controller (UC3844/45) and power mosfet, which is readily available in our market. So I request you to give me circuit schematic with all details of the transformer (core, turns, wire size etc) and design equation of a practically built and tested SMPS, so that I can built the full proof system easily.