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ATX power supply - multiple outputs

Discussion in 'Power Electronics' started by camilozk, Jun 20, 2014.

  1. camilozk

    camilozk

    109
    4
    Apr 20, 2014
    Hi there!

    I am using a ATX power supply to feed various devices. (specs attached)

    This power supply has originally 5 12V (yellow) cables.

    I soldered 5 dc connectors using this 5 yellow cables + 5 GND black cables.


    My question is, can I increase the number of dc connectors simply by dividing this yellow cables, as far as I do not demand more than 300W from it, or each of this rails has also a limit?

    I hope I explainedmyself... english is not my language... :)

    thanks!
     

    Attached Files:

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  2. OLIVE2222

    OLIVE2222

    690
    25
    Oct 2, 2011
    You have a maximum current by output.
    For the 5V it's 30A = 150W.
    For the regulation it's also better to star connect the outputs from the supply PCB (as done for the existing wiring)
     
  3. shumifan50

    shumifan50

    548
    55
    Jan 16, 2014
    You need to look at the specifications of the power supply (it is normally pasted on somewhere) to see what the maximum current allowed for the 12V is. If the power supply is rated at 300watt then the 12V will be significantly lower than the 25 amps that you expect.
     
  4. davenn

    davenn Moderator

    13,087
    1,690
    Sep 5, 2009
    He's talking about the 12V rail , not the 5V rail ;)

    Camilozk,
    had you looked at the label in your pic, you would have seen that the TOTAL power available is 300W, That's from ALL the power rails combined outputs

    it specifically states ...
    12V @ 10A = 120W max for the 12V rail

    cheers
    Dave
     
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