PQ2620 transformer footprint - Page 1
Forum section: electronics / general

author: Faringdon
author_rank: Super Contributor
timestamp: December 07, 2023, 06:48:32 pm
content: 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/B01EZQJTRYhttps://www.ferroxcube.com/upload/media/product/file/Pr_ds/PQ26_20.pdfhttps://ferroxcube.home.pl/prod/assets/pq2620.pdf

author: Kean
author_rank: Unknown
timestamp: December 07, 2023, 06:57:40 pm
content: Honestly, pretty much every time I read one of your posts I foresee problems...

author: T3sl4co1l
author_rank: Super Contributor
timestamp: December 07, 2023, 07:42:57 pm
content: Doesn't leave much room between core and pads. What insulation, reinforced? Seems so given the TIW.Tim

author: floobydust
author_rank: Super Contributor
timestamp: December 07, 2023, 08:13:23 pm
content: 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.

author: T3sl4co1l
author_rank: Super Contributor
timestamp: December 07, 2023, 08:20:16 pm
content: Quote from: floobydust on December 07, 2023, 08:13:23 pmNice 6666 count BTW

author: floobydust
author_rank: Super Contributor
timestamp: December 07, 2023, 08:33:28 pm
content: Yes it was fun in hellThat's why I step into these threads lol keep my feet warm

author: jonpaul
author_rank: Super Contributor
timestamp: December 07, 2023, 09:03:18 pm
content: 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

author: Faringdon
author_rank: Super Contributor
timestamp: December 08, 2023, 08:38:04 am
content: Thanks, this is just for the proto, and the real thing will be normal way. Just wondered about issues though.

author: jonpaul
author_rank: Super Contributor
timestamp: December 08, 2023, 02:25:03 pm
content: 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?JonAttached: pix of junk China part (NOT my desing)