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From: "Edward Rawde" <invalid@invalid.invalid>
Newsgroups: sci.electronics.design
Subject: Re: more X-rays  Silvertel PoE Supply
Date: Tue, 1 Oct 2024 22:11:57 -0400
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"john larkin" <JL@gct.com> wrote in message news:7h4pfj9dhf9dco4b4no9iheoirhagaj6i0@4ax.com...
> On Tue, 1 Oct 2024 19:06:12 -0400, "Edward Rawde"
> <invalid@invalid.invalid> wrote:
>
>>"john larkin" <jl@glen--canyon.com> wrote in message news:tipofjdtie76lbtd7lc2ger5uo7sglq3p5@4ax.com...
>>>
>>> https://www.dropbox.com/scl/fo/s6wfz2xtdyd6tv32tq3fp/AET6J4oF84HG2hJMeST6F-E?rlkey=acyvuv4z0h2kg0x97azbed8uo&dl=0
>>>
>>
>>Any discernible numbers on the chips underneath?
>>
>>https://silvertel.com/wp-content/uploads/2022/05/market-1-sm.png
>>
>
> I added a couple of pix to the folder.
>
> The so8 ic is an Onsemi STX9B, but I haven't been able to track down a
> data sheet.

Probably something like this

https://www.onsemi.com/pdf/datasheet/ncp1090-d.pdf

Or this

https://www.ti.com/lit/gpn/TPS2375

Or one of the other devices on this page.

https://www.ti.com/power-management/power-over-ethernet-poe/products.html#sort=2955;asc&

The smaller device is likely the DC-DC

>
> I've been doing my own PoE experimemts and so far nothing makes sense.

What's not making sense?

>
>