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Thread: `NEW' Small DC-DC ATX Power Supply

  1. #1
    Low Bitrate
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    Oct 2001
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    72

    `NEW' Small DC-DC ATX Power Supply

    Hey, just got done working on a new DC-DC power supply plan. It measures 4"x1.5"x1.5" (LxWxH) small. Takes the 12V input and puts out +5, -5, +3.3, +12 and -12 ATX style with all the current tolerances up to like 5amps on the +5 and 4amps on the +3.3.

    It's a ~120W power supply, so that's plenty for the higher end processors, (i.e. AMD & Intel). Also, along with the ATX connector i'm going toss in either 1 or 2 4pin power adapters as well.

    All that's needed is a 10+ Amp rated switch and a fused line to connect to this bad boy. Hook them up, then you have a DC-DC ATX Power Supply

    One cool thing, NO heatsink or fan is required!! Even at high loads! That was a tricky area for this project.

    Anyway, getting the boards fabb'ed shortly so i can test it on a real mobo instead of a bench. Will probably have 5 units within the week.

    Is anyone interested in obtaining one of these? It was originally for a project but became fun and interesting. I can make a bunch, just make me an offer.

  2. #2
    FLAC
    Join Date
    Apr 2001
    Location
    Portland OR
    Posts
    1,244
    How did you get 120 watts? with 5 amps on the +5?

    Did you just use a bunch of surface mount parts?

    Did you use coils or a transformer?

    Jeff
    MPEGBOX - Plexiglass Computer
    www.mpegbox.com

  3. #3
    Constant Bitrate
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    Dec 2000
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    Dayton, OH, USA
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    200

    PSU

    This will be interesting to see. Let me know when you want to sell a protype, or give out beta sample .

  4. #4
    Low Bitrate
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    Oct 2001
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    well, i believe it's 120Watts, but that's something that'll be measured later.. of couse if it works for the fv24 mobo that i'll test it on with 1hd and 1cd-rom drive, it really doesn't matter how many watts it is then... right?

    i used surface mount parts, but was able to get rid of the inductors and coils

    also, i used stackable boards

    can't give out beta samples, it cost me to make these, just happens the minimum is 5

  5. #5
    FLAC
    Join Date
    Apr 2001
    Location
    Portland OR
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    1,244
    Well it matters if you are going to hook a CPU up to it. A celeron 566 uses 15 watts, a celeron 1.2 uses 40 watts. 5amps times 5 volts = 25 watts so I think it makes a big difference. My power supply can only handle up to about a celeron 900, and that is if you use very few other perifs..
    MPEGBOX - Plexiglass Computer
    www.mpegbox.com

  6. #6
    Banned
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    Jun 2001
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    Adelaide, Australia
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    Could we please see some pictures of this supply???

  7. #7
    Maximum Bitrate
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    Nov 1999
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    Sydney NSW Australia
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    What I want to know is the operational input range for the supply and what technology has been used eg linier, flyback, forward
    And lastly the efficiency of it.
    Fosgate

    System Comp V3 - In progress.
    Low power MB with C7 CPU, DC-DC PSU, car ECU link, USB TV, GPS, 7" TFT, Wireless, Voice.

  8. #8
    Banned
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    Jun 2001
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    Adelaide, Australia
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    687
    Thats kinda what I wanted to know, but without asking.. I figured that by ;looking at it you should be able to work out what regulator technology was used.. :P but, yeah, TELL US!!

  9. #9
    Maximum Bitrate
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    May 2000
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    Ft Gordon, GA
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    how much would you sell them for? Pics?
    "if everything is under control, you're not going fast enough!"

  10. #10
    Low Bitrate
    Join Date
    Oct 2001
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    72
    zootjeff - ahh... yes you have a point there, i was just hoping to get over the 'hump' so that the wattage wouldn't be a concern. I'm pretty sure it's over 100Watts, but i'll keep testing it to come up with a certain number once the boards get here.

    themp3kid - like i said in the eairler posts, the order for the stackable boards went in wednesday, i probably won't be seeing them till next week... and then populating it will be quick.

    Fosgate - input i ran at 12V, but i image it'll have a range +/- 3 or 4volts, but that's something that'll be tested as well. Efficency, i'll test.

    Etrik - pics are coming, boards not coming in till next week. I'm going to have to evaluate my expenses first and see how much this thing costs to put together before i can price it.

    thanks

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