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Thread: Regulated 12 volt to 5 volt conversion - Howto?

  1. #1
    Constant Bitrate psyclobe's Avatar
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    Regulated 12 volt to 5 volt conversion - Howto?

    Guess I might be blasted for not searching, but the search engine here is kinda picky and I wasn't having any luck.

    So I have this 12 volt regulated power of 70watts. Its a dc to dc convertor from mini-itx.com. I was thinking about mounting this in the front of the car and having it power any misc perhipials I plan to mount up there, while in the rear of the car mounting the opus 150watts. So I have this slimline cd/dvd in a case which outputs to firewire, and it is requesting 5 volt dc. I bet theres an easy way to get 5 volts from a 12 volt supply, but I don't know where to look other then here.

    If you have any good reading, please point me to it.

    Thanks,
    -Jason

  2. #2
    Maximum Bitrate PTCruiser's Avatar
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    you don't need 12V regulated to produce 5V regulated...

    How much amperage do you need?

    With low amperage use a linear low drop out.
    With higher amperage use a DC-DC 12V->5V
    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!

  3. #3
    Constant Bitrate psyclobe's Avatar
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    I'm looking for a 5v @ 2.5 amps

  4. #4
    Raw Wave Rob Withey's Avatar
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    PT6625: http://focus.ti.com/docs/prod/folders/print/pt6625.html

    Small, efficient, easy to use. It's what I use to power my computer (along with a PT5071 for the 12V).


    Rob
    Old Systems retired due to new car
    New system at design/prototype stage on BeagleBoard.

  5. #5
    Low Bitrate
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    the pt6625 is out of stock.
    You could use the
    78HT305
    78ST305
    PT6302
    PT6322
    PT6653
    All from TI
    Newbee, sorry for my bad english. lol
    Trying to built a carmp3 systeem

    own psu: max788, pt5071, pt5024

  6. #6
    FLAC DodgeCummins's Avatar
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    Why not run the 5v from your Opus in the trunk.

  7. #7
    Constant Bitrate psyclobe's Avatar
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    I'm now using the atx 5v lead to power the external cdrom and its working like a champ

    Thanks,
    -Jason

  8. #8
    Newbie
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    How to regulate 12volts to 5volts

    Here is how to properly wire a voltage regulator using the LM7805 voltage regulator...Its a step by step tutorial...Voltage Regulator Tutorial

    -afreeland

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