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found plans for 86W ATX DC-DC

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  • 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
    good find moahdib....!
    Project - GAME OVER :(

    Comment


    • #3
      Probably in Italian... anyway goodfind

      Comment


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

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        • #5
          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

          Comment


          • #6
            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

            Comment


            • #7
              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

              Comment


              • #8
                Well...

                Someone said that the LM2587-12T from national Could supply [email protected] but that there was some limitation on the Coil so that it would produce [email protected]

                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 [email protected] 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

                Comment


                • #9
                  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

                  Comment


                  • #10
                    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

                    Comment


                    • #11
                      I dont mind taking pics of my powersupply since i have 3 of the arise acd-865v onces. I am no guru or genius on electronic stuff. The one person that i know can do it is prolly Sproggy and he doesn't seem to be here anymore. Jeff and and the other fellow really need to speed this stuff up. WE REALLY NEED TO SOLVE THIS 12v issue once and for all. Oooh and make sure it can power UP a HD,CDrom and stuff just like the arise ace-865v one. I dont want it comming up on amps or what not, just MAKE it work. ****, i am even willing to PAY!!!!!!!!!!!!!!
                      abcd-1
                      Author of CobraI,II,III and now CobraIV.
                      You can contact me on AOL instant messenger....nick is cenwesi or cenwesi3

                      Comment


                      • #12
                        I dont mind taking pics of my powersupply since i have 3 of the arise acd-865v onces.
                        Well, maybe that's a start..
                        Let's hope that all the components are good/clearly labeled, and
                        the components are globally available.

                        Oooh and make sure it can power UP a HD,CDrom
                        Would 5a do ?
                        Or do you need more.
                        (I guess, when we/someone is designing this, and he is able to produce like 5a, he also could produce 10a)

                        Come'on people.. 'Join the battle !!!'

                        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

                        Comment


                        • #13
                          Like I said in another post, My supply is based off of the 2587 and the limit of the part is 5 amps. That means that the most energy it can put into a coil is limited by a maximum of 5 amps. When you charge a coil, the duty cycle determines the max current that will go into the coil. If you exceed that current, you risk damaging the part. A coil ramps up in current when you apply a voltage across it. EE stuff: A Cap can't go through an instant change in voltage, inductor can't go through an instant change in current. IE. current ramps up.

                          I am using a low dropout regulator in the supply I built. If you want to by-pass the step up portion of my +12 volt rail, you can have a supply that outputs 12 volts at 5 amps with an input of 13.5 volts.


                          Like I said in another post, this supply will supply 3.3 amps with an 11 volt input and 2 amps with an 8 amp input. You could probably peak the current draw at 5 amps provided the input was at 14 volts, etc.


                          I know it is taking me forever to do this, but I am sorry and I just ask you bear with me, you probably won't be dissapointed.

                          Jeff_
                          MPEGBOX - Plexiglass Computer
                          www.mpegbox.com

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                          • #14
                            I dont mind waiting, i know now for sure you are working on it...kool
                            abcd-1
                            Author of CobraI,II,III and now CobraIV.
                            You can contact me on AOL instant messenger....nick is cenwesi or cenwesi3

                            Comment


                            • #15
                              There are NO parts that can suplly high current for 12v line if you want to use voltages below 12v ih the input.So there are three types of parts we can use: linear regulators,flyback regulators or step-up controllers.
                              Linear regulators need more than 12v in the input,so we can't use them.Flyback regulators require transformer,and the more current you need the bigger is transformer,but you can get max 2-3 A.Third way is to use step-up controllers,like MAX1771. This part use 5v in the input (which we can produce high currents with MAX787),and supply 2A RMS.This what I did,after building sproggy's PSU and disappointed with 12v section of it.
                              There are no parts that can supply more than 2A,so if you need more current use more MAX1771.If you need very high currents (5-7A) good-designed circuit using flyback regulators with appropriate transformer is the only way!
                              Enjoint life!

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