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UCC2863x, High-Power Flyback Controller with Primary-Side Regulation and Peak-Power Mode

In a design of a fly back converter the transformer used has 3 windings i.e. primary 328 μH and secondary and auxiliary windings and the primary winding has 54 turns but in the construction details the primary was split in two i.e. 27 windings each.

My doubt is should the primary windings have 4 pins on bobbin or just 2? The transformer guy used 3 pins for the primary. I have limited knowledge of transformers so if someone could help it would be great.

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  • \$\begingroup\$ Might look here on EESE. \$\endgroup\$
    – jonk
    Commented Apr 24, 2019 at 6:57
  • \$\begingroup\$ 2, 3 or 4 pins is basically down to how the guy decided to wind the transformer. I don't see why you have doubts? \$\endgroup\$
    – Andy aka
    Commented Apr 24, 2019 at 10:02
  • \$\begingroup\$ It's not the pin position im concerned about but how many number of pins used for the primary.In the design there are two pins for the primary but in the transformer construction diagram the primary is split so the transformer guy used more than 2 pins. In my pcb i have used only two connection for primary. \$\endgroup\$
    – JAGADISH K
    Commented Apr 24, 2019 at 10:18

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