Voltage Regulator Question

Discussion in 'The Projects Forum' started by pcon2009, Apr 6, 2013.

  1. pcon2009

    Thread Starter New Member

    Aug 5, 2012
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    This should be a fairly simple question for those in the know, but I am having difficulty getting a direct answer out of research.

    With a voltage regulator IC, such as an L7815CV, I understand that the idea is for it to output 15V... Question is, with what input? Will it act as a boost converter if I apply, say 12V to the input, as well as reduce the voltage to 15V if 24v were supplied?

    Hopefully someone can clarify this for me. Thanks!
     
  2. fender7802

    Member

    Apr 7, 2012
    43
    0
    Hello,

    Voltage regulators require an input voltage greater than the specified output voltage. The difference between input voltage and output voltage is known as "dropout voltage". You most likely will have to apply about 17V or more to get the 15V output (2V minimum dropout voltage).

    Hope this helps!
     
  3. tracecom

    AAC Fanatic!

    Apr 16, 2010
    3,869
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    No.


    Yes.
     
  4. gerty

    AAC Fanatic!

    Aug 30, 2007
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  5. crutschow

    Expert

    Mar 14, 2008
    13,022
    3,236
    That is a linear regulator which can only regulate voltage below its input voltage. To boost the voltage you need a switching regulator.
     
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