Top258 Design Frequency, Cable Cross Sections and Transformer Heating
In the TOP258YN chip (132kHz) design that we have designed in PI expert, it indicates the cross-section of the cable used in the primary winding of the transformer as 24 AWG.
However, as can be seen in the table with cable properties in the appendix, the skin effect occurs in 24AWG 68Khz. For this reason, our circuit overheats under 24V 4A operating conditions. The most heated element is observed as transformer. When we reduce the switching frequency, we are asked to increase the Lp. In summary, is it normal to use a 24AWG section cable in 132khz design? What could be the reason for the heating of our transformer and circuit? We also use a good heatsink for TOP258 and output diodes. At this point, we ask for your help. Required documents are attached(https://we.tl/t-QCXCzo2kJR). I hope I was able to explain.