[Moved] can anyone help me design a fly back transformer for viper22a

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hey everyone i am noe almost done with my smps design. now i used to see in many smps design that they using some PTC and NTC in the primary side in series with bridge. do anyone know the exact use of them in the design
 

hi satish,
i had used that software,but i must say that its not accurate in determining that number of turns and all.
i used some reference from fairchild application note to design the transformer.
 

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