LT1084-ADJ help

Discussion in 'General Electronics Chat' started by bytraper, May 23, 2011.

  1. bytraper

    Thread Starter Active Member

    Sep 28, 2010
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    I've been looking at a LT1084-ADJ regulator to output exactly 12v from an input supply if 12v-36V.

    My question is How do i do the math to calculate the output voltage?

    It has 1 + (R1/R2) but how to i get the 12v from those figures?

    Byt
     
  2. kubeek

    AAC Fanatic!

    Sep 20, 2005
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  3. bytraper

    Thread Starter Active Member

    Sep 28, 2010
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    You are a senior member and that's your response? Classy, but useless.

    If I understood it, Why would I come here to ask?
     
  4. kubeek

    AAC Fanatic!

    Sep 20, 2005
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  5. beenthere

    Retired Moderator

    Apr 20, 2004
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    Reading the data sheet is more useful than you think. The device will not output 12 volts with a 12 volt input. There is a minimum difference between the input voltage and the output voltage which is clearly stated.

    If you overcome that problem, use the proper fixed resistor and a trim pot to set the output to 12 volts.
     
  6. kubeek

    AAC Fanatic!

    Sep 20, 2005
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    I admit it is not easy to spot the actual datasheet on that site and not just the basic numbers, but other than that you really need to read the datasheet of any part you want to use. Starting with maximum ratings, tips on how to use the part, test circuits, ending with footprint of that part. Everything you need is in there, you just need to read it.
     
  7. bytraper

    Thread Starter Active Member

    Sep 28, 2010
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    Thanks guys, I get it now!

    believe it or not I did actually read the thing, but being a novice, i really wasn't understanding most of what I was reading!

    Cheers!
     
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