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From: Klaus Kragelund <klauskvik@hotmail.com>
Newsgroups: sci.electronics.design
Subject: Re: tiny dc/dc
Date: Fri, 4 Apr 2025 23:48:53 +0200
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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?