I have tried to design a Flyback converter with a TinySwitch-III and the PI Expert Suite (Ver 10.1).
The basic parameters are:
Input: 85~265VAC 60Hz
Output: 12VDC, 1A (12W Simple output)
In the design results the primary number of turns (Np) is 77.
When I tried to calculate this parameter with the formula of application note AN-23 (Page 7, Step 18) the result for the peak flux density (Bp) is about 3190 gauss.
But, in the same page, "Calculate primary and secondary number of turns for peak flux density (Bp) not exceed for 3000 gauss" is written.
My question is:
1) There is a problem with the PI Expert or the formula in application note?
2) Bp > 3000 its not important?
I atttached the design (.uds file) and the apllication note scan.
PD. Excuse me for my ugly english