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36V to 5V step down converter with skip-cycle

Discussion in 'General Electronics Discussion' started by eem2am, Nov 25, 2010.

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  1. eem2am

    eem2am

    427
    0
    Aug 3, 2009
    Hello,

    this is my step-down converter:

    ..it is for ...
    Vin = 36V
    Vout = 5V
    Pout = 1.67W Max

    SCHEMATIC:
    http://i55.tinypic.com/28lwh9s.jpg

    It must go into skip-cycle in light load, hence the comparator.

    It has a lot of components, but i see no cheaper way of doing this...since i need a good efficiency in light load, and a controller with low operating current.

    I found some Buck IC's but they had high internal FET current limits
    and so they would have high "staircase" current at start-up and POTENTIALLY blow the 500mA fuse which lies ahead of the above circuti on the 36V rail.
    -Also, the Buck IC's were extremely expensive, and most dod not have pulse-skipping in light load.


    by the way here is the LTSpice simulation file:-

    http://www.2shared.com/file/yKEnT4cl/5V_SEPIC__with_tripler_bias_FO.html


    do you know of a cheaper way?
     
  2. barathbushan

    barathbushan

    223
    0
    Sep 26, 2009
    use lm2595 there is no pulse slipping , but it operates at lower
    frequencies
     
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