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In development DIY DC-DC power supply with shutdown ctrl included (With a microctrl)

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  • In development DIY DC-DC power supply with shutdown ctrl included (With a microctrl)

    Power :
    http://www.just-married.ch/pt/dcdc/S...ints_Power.pdf
    Supply 8-17V DC
    +5V 5A (6A max) MAX787 freesample
    +3.3V 5A (6A max) MAX788 freesample
    +12V 1.8 A new design done with webbench
    +5V stby 1A (linear regulator)
    Fuse on board

    Microctrleur PIC 16F84 4Mhz for the logic part
    http://www.just-married.ch/pt/dcdc/S...ints_logic.pdf

    - PowerGood
    - SoftOn
    - ATX Swicth with a relay (= power button of your case)
    - Thermal switch (60°C cut of)
    - 5V Stby Switch
    - Enable/Disable power supply
    - led de status (ON, STBY...)
    - Input 12V accessory


    Can be upgraded

    5 I/O of the pic are free to drive more relay, temperature sensor…

    Cost ~70-80 $

    All part from www.farnell.fr except T6… (farnell=newark)
    I will post the part n°...

    All design made with protel

    160x46 mmm

    I will do the prototype + testing this month I hope...





    Source Protel:
    http://www.just-married.ch/pt/dcdc/DCDC_ProtelDXP.zip
    http://www.just-married.ch/pt/dcdc/DCDC_Protel99.zip
    Epia M9000, lili 7" vga&touch & 2xTM-7002S compo, camera with reversed image, 2.5" 60 GB, 256Mb DDR, Opus 90W, GPS usb... AND MEDIACRUISER of course!

  • #2
    Re: In development DIY DC-DC power supply with shutdown ctrl included (With a microctrl)

    no -5 or -12?
    -
    My cars
    -

    Comment


    • #3
      No...

      It's specific to the EPIA motherboard (my own need...)
      Epia M9000, lili 7" vga&touch & 2xTM-7002S compo, camera with reversed image, 2.5" 60 GB, 256Mb DDR, Opus 90W, GPS usb... AND MEDIACRUISER of course!

      Comment


      • #4
        heh ok
        -
        My cars
        -

        Comment


        • #5
          Re: Re: In development DIY DC-DC power supply with shutdown ctrl included (With a microctrl)

          Originally posted by jol
          no -5 or -12?
          -12v and -5v can be easily made on a tiny daughterboard if you need them using one Maxim chip and and 3 support components. This is what I had to do in my system to get my serial port working as the PSU i made only supplies 5v and 12v (Cause I didnt think I would use the serial port - Now Im using TWO!).
          -------------------------------------------
          (=========-) 99% complete
          --------------------------------------------
          AMD K6/2 500 @ 450mhz to keep heat and power usage down, 64Mb, slim CDrom drive, 64mb USB pendrive for MP3 transfer, 10Gb 2.5" drive for MP3, USB>RS232
          All jammed in external CDROM drive case.
          Kenwood KVC-1000r In-Dash LCD. x-10 MouseRemote. Destinator V2 Gps. DC-DC with onboard Shutdown controller.
          ----------------------------------------------

          Comment


          • #6
            If you want you can mdify the design (you'll need protel) to add the -5V and -12V

            As I use a T6 you can simply use it to generate the -5V and -12V
            like on the original sproogy...

            http://upload.nowherenews.com/files/20232952.jpeg


            But on the mini-itx mainboard you don't need the negative voltage anymore...

            And +12V is very usefull for the 3.5" hardisk (here I should get 1.8A cst)
            Epia M9000, lili 7" vga&touch & 2xTM-7002S compo, camera with reversed image, 2.5" 60 GB, 256Mb DDR, Opus 90W, GPS usb... AND MEDIACRUISER of course!

            Comment


            • #7
              Switzerland in da place !
              NS - neocar suite
              -----------------
              http://www.neocarmediacenter.com

              Comment


              • #8
                Great idea!

                But according to the schematics, T301 has one of its windings grounded. I've never seen such a thing before.

                Comment


                • #9
                  You mention this is being designed for the Epia. Is it for the Epia-M?

                  Keep in mind the compatiblity problems we've found associated with he OPUS and the Sproggy's. What are you doing different to make it compatible?

                  Comment


                  • #10
                    But according to the schematics, T301 has one of its windings grounded. I've never seen such a thing before
                    Well I made a redisgn of the +12V with webbench:

                    http://www.just-married.ch/pt/dcdc/12V_sch.JPG
                    http://www.just-married.ch/pt/dcdc/12V_part.JPG

                    PCB will be done here:
                    http://www.olimex.com/pcb/index.html

                    with Solder mask layer,finish reflowed SnPb, white component mark, NC drill...21$ for 2 pcb!

                    Sorry I will upload again the logic part the pdf is a blank page...

                    http://www.just-married.ch/pt/dcdc/...rints_logic.pdf

                    Epia M9000, lili 7" vga&touch & 2xTM-7002S compo, camera with reversed image, 2.5" 60 GB, 256Mb DDR, Opus 90W, GPS usb... AND MEDIACRUISER of course!

                    Comment


                    • #11
                      @ digitallexus: I heard this problem... (I have a EPIA-M)
                      I hope that it comme from the powergood signal of the sproogy that comes too early...(but i am not sure...)

                      Sa I do the powergood signal with the PIC I can set a bigger wait time...
                      Epia M9000, lili 7" vga&touch & 2xTM-7002S compo, camera with reversed image, 2.5" 60 GB, 256Mb DDR, Opus 90W, GPS usb... AND MEDIACRUISER of course!

                      Comment


                      • #12
                        Did you take a look a the output ripple from webbench? It lookes like your caps are very small. What value caps did you use for the input and output and what is their rated ESR? I guess if you looked at the output on an AC coupled O-scope, you could make sure your not violating the ripple specs..
                        MPEGBOX - Plexiglass Computer
                        www.mpegbox.com

                        Comment


                        • #13
                          For the +12V line:

                          Cin 1500uF (0.029 ohm)
                          Cout 2200uF (0.018 ohm)

                          Panasonic low ESR cap...

                          I think it's big enough?

                          For the +5V & + 3V exactly the same that on the sproogy original design (= maxim typical application)


                          And yes I did make a simulation on the output ripple from webbench

                          Thanks for the comments zootjeff...I really liked your design!
                          Epia M9000, lili 7" vga&touch & 2xTM-7002S compo, camera with reversed image, 2.5" 60 GB, 256Mb DDR, Opus 90W, GPS usb... AND MEDIACRUISER of course!

                          Comment


                          • #14
                            Will you make the PIC software available to the public?

                            Comment


                            • #15
                              Originally posted by PTCruiser
                              For the +12V line:

                              Cin 1500uF (0.029 ohm)
                              Cout 2200uF (0.018 ohm)

                              Panasonic low ESR cap...

                              I think it's big enough?

                              Thanks for the comments zootjeff...I really liked your design!
                              Yaa that looks good for the + 12 I do question the sproggy though.. I have seen a bunch of people put generic ESR caps on their designs and there is no real way to test the output ripple with out an oscope. The output and input cap of the 3.3 and 5 should also have about the same ESR rating.
                              MPEGBOX - Plexiglass Computer
                              www.mpegbox.com

                              Comment

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