Calculations in PI

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Hi,

 

Things that are unclear for me ..

 

PI calculated 2x27AWG for bias. In Design Result tab bias current is 0.001A. Why use such a  big wires ?

 

And again same design

Prim inductance PI says 1400uH

Calculated Lp=Vpkmin / ((1+Kv) x fswmin x Ipkp ) = about 600 uH

 

Witch one is right for TNY 4?

 

Many transformers calculated by PI are wrong. Window area is too small for suggested wires. (EFD series)

PI doesnt show any warnings.

 

Hope somebody can answer my questions

 

Best Regards

J.

 

 

 

 

첨부 파일Size
TinySwitch-4_PIDesign_26V.uds289 KB