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Thread: found plans for 86W ATX DC-DC

  1. #1
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    moahdib's Avatar
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    Post found plans for 86W ATX DC-DC

    This looks like a good PSU the page is in spanish or something tho hehe





    here is the guy's car PC webpage: http://dmc.freeweb.supereva.it/

    there's another version of it... http://mysite.ciaoweb.it/casahardware/car_mp3.htm

    Since I am no good at building these things i just thought I'd share my finding.
    04 Acura TL w/ core2duo 2ghz laptop w/ 1gb RAM on a docking station.

    Fast car, fast PC. ;)

    http://www.arcdesigns.net/carpc/

    My TL CarPC ver2

    FSR Flash Skin w/ moving weather maps

  2. #2
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    good find moahdib....!
    Project - GAME OVER :(

  3. #3
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    Probably in Italian... anyway goodfind

  4. #4
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    yep.. it's italian. babelfish does a fair job of translating

  5. #5
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    nevertheless...whatever language it may be that's a tight little PSU =)
    Can anyuone figure out what the input range is ?? 8-14V perhaps?
    04 Acura TL w/ core2duo 2ghz laptop w/ 1gb RAM on a docking station.

    Fast car, fast PC. ;)

    http://www.arcdesigns.net/carpc/

    My TL CarPC ver2

    FSR Flash Skin w/ moving weather maps

  6. #6
    Maximum Bitrate Raas's Avatar
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    Can anyuone figure out what the input range is ?? 8-14V perhaps?
    I Tracked down the datasheet of the MC78TI12CT which is used in this schematic to produce the +12v output.

    "The input-voltage must remain typically 2.2v above the output voltage even during the low point on the input ripple voltage..."
    So this thing must have 14v to run properly.
    Damn... sounded too good to be true

    Greetz
    Raas - The Netherlands
    ME: VIA epia m10000, lilliput 7', opus 150w, 80gb<br>
    GF: IBM Thinkpad 380, ext. 3.5 80gb, 40x4, PB-IR

  7. #7
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    Hmm can't you just add another type of voltage regulator?
    One that can accept from 8-14V and output 12V 3A??
    04 Acura TL w/ core2duo 2ghz laptop w/ 1gb RAM on a docking station.

    Fast car, fast PC. ;)

    http://www.arcdesigns.net/carpc/

    My TL CarPC ver2

    FSR Flash Skin w/ moving weather maps

  8. #8
    Maximum Bitrate Raas's Avatar
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    Well...

    Someone said that the LM2587-12T from national Could supply 12v@5a but that there was some limitation on the Coil so that it would produce 1-2a@12v.

    Maybe another Coil ???

    But when you're going to use the LM2587-12T, you're almost going to build the sproggy-supply. The design mentioned by you also used the 'popular' MAX788 & MAX787
    This design is very similar.. It's only supplying more current on the 12v rail, but therefore it needs an input off at least 14v.

    Damn....
    Why is it so hard to find a decent component that produces like 12v@5a with Vin = 8-16 Anyone ??

    Greetz.
    Raas - The Netherlands
    ME: VIA epia m10000, lilliput 7', opus 150w, 80gb<br>
    GF: IBM Thinkpad 380, ext. 3.5 80gb, 40x4, PB-IR

  9. #9
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    Cool

    Come on ppl....someone really need to produce a good/real DC-DC atx psu. I have my next altimate project overloading my brain cells, i need to ofload some of these thoughts and logic hurry damnit
    abcd-1
    Author of CobraI,II,III and now CobraIV.
    You can contact me on AOL instant messenger....nick is cenwesi or cenwesi3

  10. #10
    Maximum Bitrate Raas's Avatar
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    just checked the lm2587-12t datasheet.

    It states that it CAN supply 5a
    but that's only with the lower (output) voltages
    At 12v you can get 1.2A at best

    Charles is absolutely right we all need to combine our forces and thought about this 12v issue.
    It's pretty easy to produce the 5v and 3.3v voltages, with some components we could easily produce 10a, 15a or maybe even more A's (use some more of the maxim-chips)
    But why are we still having this problem with the 12v rail ???

    I suppose the Keypower & Arise power-supplies will produce more than enough current @ 12v
    Isn't there a way that we can 'adapt' some of this ??? (in other words... could someone open the PSU to find out how they handled the 12v.)

    I'm absolutely no electronics-wizard, but I do find it a bit hard to believe that there isn't some way that we can produce 12v @ 5a (at least!)

    F^(#ing 12 volt issue !!!!!

    Greetz
    Raas - The Netherlands
    ME: VIA epia m10000, lilliput 7', opus 150w, 80gb<br>
    GF: IBM Thinkpad 380, ext. 3.5 80gb, 40x4, PB-IR

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