Buck converter operation

Discussion in 'General Electronics Chat' started by EngIntoHW, Oct 15, 2012.

  1. EngIntoHW

    Thread Starter Member

    Apr 24, 2010
    128
    0
    Hi,

    As part of my project, I'm trying to integrate the following buck converter into my design (DC to DC voltage converter).

    Could you please indicate its main principles of operation?

    Is it correct to say that large Duty Cycle of the CMP signal produces high voltage (close to VBAT Port's voltage) at the output? (Load port)

    [​IMG]

    Thank you very much.
     
  2. EngIntoHW

    Thread Starter Member

    Apr 24, 2010
    128
    0
    Could anyone help please?
     
  3. bountyhunter

    Well-Known Member

    Sep 7, 2009
    2,498
    507
    I designed buck converters for about 30 years, and I have absolutely no idea what that drawing is supposed to be.

    As an approximation, the output voltage is the input voltage multiplied times the top switch's duty cycle (neglecting voltage drops across switch elements).

    If you want to understand how a buck works, here is an app note on it:
     
    Last edited: Oct 16, 2012
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  4. takao21203

    Distinguished Member

    Apr 28, 2012
    3,577
    463
    I have come across some stuff over the years, however until now I never saw an OpAmp with 100 GHz bandwidth.

    Moreover, buck converters can be had a lot cheaper using simulation software (for instance LTSpice).

    The information where he obtained this particular design is absent.
    The information what software he is using is absent.
    The information what modification or experiments he already made is absent.

    But nonetheless, the flyback diode is already substituted with a MOSFET. I am impressed.
     
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  5. bountyhunter

    Well-Known Member

    Sep 7, 2009
    2,498
    507
    :p

    I think Radio Shack sells them.....
     
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