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TinySwitch4 transfomer design

Posted by: mikem3652 on

Hi. I am new at a company and some of the legacy products at this company use the TinySwitch-4 in fly-back topology with the transformer polarity windings from primary to secondary wound in the same direction and voltages in-phase. When I review the TinySwitch-4 datasheet and when I run some designs with PI expert using this same topology, the transformer has the winding polarities between primary and secondary with opposite polarities so voltages are out-of-phase. So as a question, the products do work but what, if any, are there adverse effects that may add stress to components? Does this impact efficiency? Thanks.

Comments

Submitted by PI-TonyS. on 02/18/2020

Hi Mike,
First of all, thank you for using PI's product.
According to the description, the transformer winding construction seems to be in phase, which should be a forward topology, do you have an inductor at the output before the capacitor? Is there a de-magnetizing winding in the transformer?
It would be very helpful if you can share the schematic.
Thank you!