19V Open-Frame AC-DC PSU?

[GrievousJack]

To make a long story short, I've been searching across the entire internet for a 19V open frame AC-DC PSU (much like Mean Well's units, in a 2x4 form factor), that is capable of 140W passive minimum, continuously. HDPlex PSU's are too long, even the 160W or 200W options. While 19V is an odd voltage, I am looking to use it with a Dynamo 360, in order to pass 19V through to an STX motherboard, and use the 12V coming from it for a powered PCIE riser.

 

[REVOCCASES]

which motherboard are you using? most of them can accept a much lower voltage than 19VDC. the Deskmini (A300/X300) STX boards for example run just fine on 12VDC despite "officially" requiring 19VDC.

 

[GrievousJack]

which motherboard are you using? most of them can accept a much lower voltage than 19VDC. the Deskmini (A300/X300) STX boards for example run just fine on 12VDC despite "officially" requiring 19VDC.

I'm using the ASRock H470M-STX. Couldn't find any voltage input specs other than 19V.

 

[Arboreal]

which motherboard are you using? most of them can accept a much lower voltage than 19VDC. the Deskmini (A300/X300) STX boards for example run just fine on 12VDC despite "officially" requiring 19VDC.

@GrievousJack, thank you for asking the question. I was literally asking an electronics engineer friend last night about this!
@REVOCCASES, that is good news thanks. I have a 1050Ti and A300 combo to try, Meanwell 300W 2x4 looks like the answer

 

[REVOCCASES]

that is good news thanks. I have a 1050Ti and A300 combo to try, Meanwell 300W 2x4 looks like the answer

That should work well. Here are some other projects that might help you:

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smallformfactor.net

@GrievousJack unfortunately I haven't any experience with that particular board but I think it's worth a try and see if it runs with 12VDC

 

[robbee]

I will be testing this particular H470 stx board with a 12v meanwell supply in the coming days so will be able to tell you soon enough!

 

[msystems]

It seems probable that it would work on a wide input like the x300. It has the same form factor (155 x 155mm), same case, same location of the barrel connector, same front I/O, and ships with the same 19v 120w brick used in the other Deskmini. The VRM arrangement is located differently on the board, but maybe the power handling is the same under the hood.

Just doing a quick search on Asrock's Industrial boards, they seem to be 12-19v for Intel too.

 

[robbee]

A long overdue bump on this, I haven't been able to test the H470M stx until now. Lo and behold, where the AMD stx boards had no issues at all with 12V, the H470M doesn't boot at all. Anyone got any advice as to things I can try to measure with my multimeter to make sure everything is wired alright? The barrel connector voltage and polarity is fine.

EDIT: forgot to mention but the board boots fine with a 19v brick

 

[robbee]

So another update, which isn't encouraging. My Talos case, which uses the Mini-box 160XT, runs fine with the Meanwell RPS 12V I tested earlier with the H470M STX. Meanwhile, the STX board also doesnt work with the Meanwell LSP 12V I'm using with the 160XT.

I can only conclude that the H470M STX doesn't work using 12V. I'm reading reports on the discord from @Josh | NFC that the B660 version also doesn't work using 12V. It's such a shame because I have a build which is 90% finished but it relies on this... Gue'ss i'll wait for the AM5 version as I'd like to use PCIe 4.0 for my GPU riser.

I've sent a support request to Asrock nonetheless to be sure.

 

[REVOCCASES]

Thanks for testing this setup. Really too bad it doesn't work out with 12VDC. Guess we were just lucky that the A300 STX was accepting 12V just fine.

If you don't find another solution maybe you can try getting the Picobox DCDC200 (or other step down modul) to hook up the GPU.

https://m.de.aliexpress.com/item/4001338601796.html?gatewayAdapt=gloPc2deuMsite

 

[msystems]

Just tried the b660 on 14v and didn't turn on either . Thanks for testing, that is really disappointing that it doesn't work.