I tried the link of that software its ease give some other link to access it. The NXP® Flyback SMPS Design Tool helps you design flyback power supplies using NXPs TEA172x, TEA173x, TEA183x, and TEA193x family. PowerEsim is free SMPS power supply design, manufacturer & product database/list, switching converter topologies, circuit analysis, magnetic design software, transformer/inductor simulation & calculation software, DVT, Differential mode EMI simulation, EMI measurement, Harmonics, Thermal, MTBF, Life time and Monte Carlo analysis tool. I am not so experienced with designing transformers and smps. I believe the transformer is the culprit. But the max efficiency i am getting is only 57%.this transformer is for 5v/12w so i designed it for 5v and when load is applied to get 1.5 A the voltage drops to 4.8v. Now as a trial i used some transformer for viper series other than viper22a but i remember both where having switching freq 60khz.so i expected it to work really well. The efficiency is very important since its going to be industrial product. I will need two secondary output one of 3.3v 1A and other of 16v 0.2a. Okk i will make my requirement clear.i am designing this smps to provide power for a powerline communication board.
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