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12volt Regulated Supply help needed.

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  • 12volt Regulated Supply help needed.

    Just wondering if any of you tech heads could help with this request?
    It is needed to power a 12 inch LCD. must be 12 volts @1.5 amps continuous. I dont think the LCD will like the 14.1 volts my alternator puts out when its running

    Im sure there is a single IC that would do the job, but Id rather not fry the screen for the sake of asking someone who knows best.

    Thanks in Advance,

  • #2
    The best way to do this would be to use the 12volt part of the sproggy supply...
    Actually, that might be the only real way..
    no other, simple, way will give the 12volts constant..

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    • #3
      See thread question regarding DC/DC supply

      Not sure if the link will work, may have to search for thread.

      Rob
      And you say people actually pay money for M$ Windows?
      www.mp3mini.co.uk (Does what it says on the URL) www.openclassic.co.uk (The new car, with zero rust!) www.rob-web.co.uk (My other site)
      Total re-design underway: on the whole progress is very slow as the car is taking up too much time :)

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      • #4
        12v out is kinda hard to get being inside the range of your input voltages..
        Couple of ways to do this..
        the way easiest and fairly effiecent (i think) would be to boost to 15v and the buck with a Low Dropout Reg back to 12v. With a couple capacitors inbetween each step you could make sure that expensive TFT stays safe.

        National Semi makes LM2577-15 to get you to 15v (sample available)
        and makes LM1084 to bring it down to [email protected] (On Semi might have a sample of the equivalent).
        You might what to check the Max current of the LM2577 though.
        [SIZE=1]'91 Nissan Stanza

        [XXXXXXXXXXXXXXXXXXXX] XX% Completed -
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        • #5
          Thanks for the tips, sounds like a plan

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          • #6
            If you were to use the 12volt part of a DC-DC PSU, would you use +12volts and -12volts, or would you use +12volts and ground?
            Car computer and console.

            Shuttle FV-24, 100gig, DVD, 10.4 VGA TFT, 866MHz, 128MB Ram, Keyspan remote, DC-DC

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            • #7
              Originally posted by steve671:
              <STRONG>If you were to use the 12volt part of a DC-DC PSU, would you use +12volts and -12volts, or would you use +12volts and ground?</STRONG>
              +12volt and ground...

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              • #8
                Thank you sir...
                Car computer and console.

                Shuttle FV-24, 100gig, DVD, 10.4 VGA TFT, 866MHz, 128MB Ram, Keyspan remote, DC-DC

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