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

  1. #1
    Maximum Bitrate PTCruiser's Avatar
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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

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

    no -5 or -12?

  3. #3
    Maximum Bitrate PTCruiser's Avatar
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    No...

    It's specific to the EPIA motherboard (my own need...)

  4. #4
    jol
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    heh ok

  5. #5
    Variable Bitrate
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    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.
    ----------------------------------------------

  6. #6
    Maximum Bitrate PTCruiser's Avatar
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    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)

  7. #7
    Maximum Bitrate netsuo's Avatar
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    Switzerland in da place !

  8. #8
    Variable Bitrate mp3hombre's Avatar
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    Great idea!

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

  9. #9
    Constant Bitrate
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    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?

  10. #10
    Maximum Bitrate PTCruiser's Avatar
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    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


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