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SMPS feedback loop is "easy"?

Discussion in 'General Electronics Discussion' started by eem2am, Mar 8, 2013.

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  1. eem2am

    eem2am

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    Aug 3, 2009
    Hello,

    Please could you help to define what circuit elements are (and which are not) in the feedback control loop of this SEPIC LED driver…………….

    http://i46.tinypic.com/jttquc.jpg

    V(in) is fixed at 6V.

    Input current is regulated by the loop.
    Output voltage could be anything between 5V and 40V.
    Input power is limited to 7W.

    The converter is a SEPIC , but I believe that the actual converter topology could have been anything, and the control loop would not change…is this true?

    I mean, the converter’s power stage and output capacitors simply are not in the feedback loop…do you agree?
    The feedback loop simply involves the input capacitors..is this true?
     
  2. Harald Kapp

    Harald Kapp Moderator Moderator

    10,385
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    Nov 17, 2011
  3. BobK

    BobK

    7,682
    1,686
    Jan 5, 2010
    Not much of a feedback loop if the output is not included.

    Bob
     
  4. eem2am

    eem2am

    414
    0
    Aug 3, 2009
    ,,,the circuit regualtes the current drawn from a 6V battery...theres no need to regulate the output voltage or current......that just happens as a result that the input current is regulated.
     
  5. BobK

    BobK

    7,682
    1,686
    Jan 5, 2010
    If the load is constant.

    Bob
     
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