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Thread: DC-DC PSU for 6pin input

  1. #1
    Maximum Bitrate Dave One's Avatar
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    DC-DC PSU for 6pin input

    I am using an old iCue book PC (BkMVP4 AMD 450 MHz made by Amptron) for my Carputer build. The motherboard has a 6pin atx connector from a 100Watt 2Amp power supply.

    Pin 1 - 5vsb
    Pin 2 - Ground
    Pin 3 - Ground
    Pin 4 - PS on
    Pin 5 - +12v
    Pin 6 - +12v

    I would prefer not to use DC-AC-DC and would appreciate any suggestions for a DC-DC power supply, or 20pin atx to 6 pin atx adaptor for DC-DC power supplies.
    Vauxhall Astra SXi Car PC installed.

  2. #2
    Constant Bitrate KaiTech's Avatar
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    This might be the answer, although it is only 80W.
    http://www.opussolutions.com/modules...article&sid=25

    You would need to check how much current each line draws.

    Output: 80W
    +5V: 8A Max, 10A Peak
    +5V STDBY: 1A Max, 1.5A Peak
    +12V: 3.3A Max, 4A Peak
    Power supply overall efficiency >90%

    Would be alot better than DC>AC>DC

    From what I've read about it, it only takes
    +5V STDBY: 1.5VA
    +12V: 6A

    Call Opus and find out if you can get the 80W with just 12V and 5V SB.
    It should produce:
    +5V STDBY: 1-1.5A
    +12V: 6.7A
    Changing the connector from 8 to 6 pin shouldn't be a problem.
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  3. #3
    FLAC
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    ...or you could try the CarNetix P1280 in the MP3Car.com store. It can provide [email protected] plus +5V@3amps, plus startup/shutdown control, delayon for audio amps, and pulse start.

    Do you know the current requirements for the +12V & +5V rails?
    MikeH

  4. #4
    Maximum Bitrate Dave One's Avatar
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    Power supply

    Would this http://www.mp3car.com/store/product_...products_id=29 product be a viable option? I would appreciate any advice. The only problem would be the lack of startup/shutdown controller, I guess?
    Vauxhall Astra SXi Car PC installed.

  5. #5
    FLAC
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    Dave,

    The PW70 requires a regulated +12V input to operate properly in an automotive environment. If you only need +12V and +5V out, the PW70 would be redundant.
    MikeH

  6. #6
    Maximum Bitrate Dave One's Avatar
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    The power requirements are:-

    Yellow +12v 5.5A
    Purple 5vsb 0.8A
    Black Ground Return
    Green PS-on Signal

    The 6pin connector is the only output from the PSU. All peripherals are powered from the motherboard. I don't want to fry the mobo and feel dc-dc is the best solution, i just want to be sure before attempting the install.

    Cheers
    Vauxhall Astra SXi Car PC installed.

  7. #7
    FLAC
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    Dave,

    That sounds like a perfect fit for the P1280. Use the primary output to feed the +12V and the secondary output as your +5VSB. You can jumper the +5 for "always on" so that it is always present when your battery is connected. The PS-ON is the ACPI out of the P1280.
    MikeH

  8. #8
    Maximum Bitrate Dave One's Avatar
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    MikeH,
    Thanks for your help. Will give the P1280 a go. Cheers.
    Vauxhall Astra SXi Car PC installed.

  9. #9
    Maximum Bitrate Dave One's Avatar
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    MikeH,

    Does the motherboard need the 5vsb or is purely to provide power to enable 'wake up on LAN'. In which case would the P1260 be sufficient.

    Once again, thanks for your advice.
    Vauxhall Astra SXi Car PC installed.

  10. #10
    FLAC
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    Dave,

    I'm not really sure. But the P1280 is a bit beefier (5.5 amps) than the P1260 (5 amps). If you end up adding several power-hungry USB devices (ie Audigy 2NX sound card, wifi, etc) you'll need the extra +5V power anyway. I'd recommend sticking with the P1280.
    MikeH

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