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Path: news.eternal-september.org!eternal-september.org!.POSTED!not-for-mail From: Klaus Kragelund <klauskvik@hotmail.com> Newsgroups: sci.electronics.design Subject: Re: tiny dc/dc Date: Fri, 4 Apr 2025 23:48:53 +0200 Organization: A noiseless patient Spider Lines: 25 Message-ID: <vspk45$gubf$1@dont-email.me> References: <53gbujdfpu4u12kf5lkd3tk2evnf06fpi4@4ax.com> <m4ts80Fopu2U1@mid.individual.net> <87ljujttp23urfh2gk373nk8pdhfbv5j0n@4ax.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Injection-Date: Fri, 04 Apr 2025 23:48:54 +0200 (CEST) Injection-Info: dont-email.me; posting-host="04125b9b856f331104bd8ac40e73662f"; logging-data="555375"; mail-complaints-to="abuse@eternal-september.org"; posting-account="U2FsdGVkX18pYcz8MspBH04WIXxRd8jiPbdcBx+Okoo=" User-Agent: Mozilla Thunderbird Cancel-Lock: sha1:PaQfxvnrIfWnmUjuBEDqpOs4pg8= In-Reply-To: <87ljujttp23urfh2gk373nk8pdhfbv5j0n@4ax.com> Content-Language: en-GB On 31-03-2025 01:37, john larkin wrote: > On 30 Mar 2025 21:43:28 GMT, Uwe Bonnes > <bon@hertz.ikp.physik.tu-darmstadt.de> wrote: > >> john larkin <jl@glen--canyon.com> wrote: >>> Check out UCC33420. >>> >>> It's a tiny cheap isolated dc/dc converter. It switches at 64 MHz! >>> >> >> I guess Murata NXJ switches at a similar frequency! > > About 100 KHz. > > https://www.dropbox.com/scl/fo/w90gg474w9h0wsqkbpd9e/AC8Oh-LB9La9PcvIGGOYWtg?rlkey=agwx067u5vk6z04ir2ktp4dy0&dl=0 > That vertical relative to the PCB winding structure is really nice. Solved problems with clearances. If only I could have a PCB manufactorer do that, but maybe it's out there. Murata is 3.11mm PCB. Could be done with 2 1.6mm PCBs, and pocket milling, turned over, plopping in a ferrite, glue, and solder. But, do they make the vias after the ferrite has been sandwiched?