PQ2620 transformer footprint

[Faringdon]

Hi,
We are doing a 40W Flyback (24vin, 24vout) with a PQ2620 core. We will not terminate the TIW to the pins as its too difficult. So we put extra pads in the PCB and just solder the coil ends directly into the PCB as in the attached. Do you foresee problems?

https://www.amazon.co.uk/DealMux-Plstic-PQ2620-Ferrite-Robbin/dp/B01EZQJTRY
https://www.ferroxcube.com/upload/media/product/file/Pr_ds/PQ26_20.pdf
https://ferroxcube.home.pl/prod/assets/pq2620.pdf

[Kean]

Honestly, pretty much every time I read one of your posts I foresee problems... 

[T3sl4co1l]

Doesn't leave much room between core and pads. What insulation, reinforced? Seems so given the TIW.

Tim

[floobydust]

It their a bobbin or not? Pads on your footprint make no sense they look out to lunch.
You sure it's only "24V" and safety isolation is not a concern? Why use TIW then?
Giving us fake or partial requirements is what frustrates forum members, as you know.

Flying leads is a labour intensive way to go and requires regulatory proof and testing this is exactly how it's being built and part of your manufacturing Quality program, if their is a HV isolation requirement for safety.
I see teflon spaghetti used and prepping the wire ends is not likely to be fun because your designs are historically too small, there will be no room to poke wires in.

[T3sl4co1l]

Nice 6666 count BTW

[floobydust]

Yes it was fun in hell  That's why I step into these threads lol keep my feet warm

[jonpaul]

Just another FTTS troll.

"will not terminate .. to the pins .. too difficult"

We used genuine TDK PQ, and other   bobbins like ETD, EER and never had his "problem"

j

[Faringdon]

Thanks, this is just for the proto, and the real thing will be normal way. Just wondered about issues though.

[jonpaul]

FTTS: Your usual troll caught my attention.
Despite my better judegement here is an answer: Find  GENUINE origianl TDK and JIS spec.
Normal industry prectice for PQ, ETD, EER bobbins term to pins according to  max wire size capacity of pins ,  for the primary/HV /low I wdgs.
The  high current wdgs , eg low V outputs,   term the two  wdg ends  direct to flexible flying leads, of the required ampacity. Term with desired AMP or other connectors.


YOUR INVOICE FOR MY TIME : $250 Master card or visa card?

Jon

Attached: pix of junk China part (NOT my desing)