different data for the transformer (PI Expert and PIXls)

Posted by: bibaua on 12/17/2013

I work with LNK420 with PI Expert and PIXls. At the same input parameters in VAC(170-265), I = 0.9A, U = 48V and the same core ETD29 get different data for the transformer (windings, Gap (0.658 and 0.955), the inductance 793 and 691). Who precisely PI Expert or PIXls?

Comments

Hi,

Would you please attached both the PI expert and PIXLs that you designed, I can have a check to see what happen.

Thanks

Hi,

files in the attachments

Hi.

Sorry about the disparate results you are getting. There is indeed a bug that makes the pixls transformer datasheet display the minimum inductance, instead of the typical value. In the spreadsheet itself you can see the correct value (line 38)

There were also some small differences between the two files (Pixls and PIExpert). Once those differences are taken out, the inductance results are within 3% of each other.

The PIExpert version contain no such bug.

Sorry about the inconvenience. I attached both files (and I made a very small change on IFB so that IO and IO_actual match).