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Thread: 12V 4.16amps

  1. #1
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    Question 12V 4.16amps

    Hello,

    I would like to put a KDS Rad-5 lcd in my car. The problem is powering the thing. It takes 12v at 4.16amps. Does anyone have any idea where to get or how to build a regulator that will make this work??

    Thanks guys

  2. #2
    FLAC
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    I can sell you one for 60 dollars..
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  3. #3
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    If you're appropriately saavy you can use a low-dropout linear regulator (LM1084) on a decent heatsink to do that.

  4. #4
    FLAC
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    Originally posted by RobM
    If you're appropriately saavy you can use a low-dropout linear regulator (LM1084) on a decent heatsink to do that.
    If that will work for you.

    I have a 12 volt 5 amp design that takes in 9 to 18 volts and puts out 12.
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  5. #5
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    Originally posted by zootjeff
    If that will work for you.

    I have a 12 volt 5 amp design that takes in 9 to 18 volts and puts out 12.
    I didn't mean to respond to your post; obviously a switcher is a better idea but a LDO linear is a cheap 90% solution. A lot of this stuff have their own power supplies built in anyway.

  6. #6
    Newbie dsoares's Avatar
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    Diego Soares

  7. #7
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    Look at Digikey for overpriced but obscure electronic components.

    www.Digikey.com

    Catalog, page 443. Its a TI switching regulator IC for 12V @ 5A with an input voltage of 3 to 28 volts. (Yeah, I'm skeptical too.)

    Part Number PT6656[D/E/P] (D/E/P will depend on SM, horizontal, or vertical mount package.)

    This is almost 30 dollars.

    Then you need special capacitors of 550uF and 330uF that are made by Panasonic, also available at Digikey.

    The papers for this IC is available at Texas Instrument's web site.
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  8. #8
    Variable Bitrate slarty's Avatar
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    With regards to the question. 12v 4.16Amp. Did you find a suitable regulator?

    I am on the search for a 12v 4.58Amp regulator for the EPIA M 9000 board. I have seen these DC to DC 12v 5AMP regulators but it seems to me that if the manufacturer placed there spec @ 12v 4.58Amp or in your case 4.16Amp, they did it for a reason.

    Can anyone help on this. I have the kit but am nervous of putting it into the car without a regulator.
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  9. #9
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    Not trying to hi jack the thread here but....

    Since it's been suggested that you use the PT6656 I figured I'd drop this in. Perhaps you'll benefit from it. You can get the PT6656 from Texas Instruments from free and best of all you can have it tomorrow. If you go to www.ti.com and register for samples they will overnight it to you. That being said you will need two capacitors (560uF and 330uF) and some time to get everything going.

    Now here's where my question comes in. I am trying to regulate 12 volts with this setup and it doesn't seem to be working right. I have a PT6656 and 570uF of capacitance on the input and 320uF on the output. I couldn't land 560uF and 330uF capacitors but from my days of electronics school I seem to remember that capacitors in parallel add together and that there is generally a 20% tolerance where a circuit should still perform correctly.

    On the input I have one 470uF and one 100uF in parallel and on the output I have one 220uF and one 100uF in parallel. All cap's are 35v. I've triple checked all of my connections and everything and can't seem to find the problem. What the circuit is doing is mimicking a linear regulator. Any voltage above 12 get's brought down to 12v but anything below get's passed to Vo. I've tried tieing Vadj to Vo and Gnd. This adjusts the output to the high and low end but doesn't correct the problem. I've also tried tieing remote to the output this also fails to correct the problem. All of my test were performed with a small load on the circuit. Any ideas?

  10. #10
    Maximum Bitrate eugenen's Avatar
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    Either digi-key or someone else has the wrong specs, from TI's site the PT6656 is a step down onyl regulator. For step up and step down you would need something like the PT5071 (its only 1.5A though)

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