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Flyback converter slope compensation

Discussion in 'Embedded' started by Vladimir Vassilevsky, Nov 1, 2006.

  1. I spent a day trying to find a proper slope compensation resistor +
    current feedback resistor combination for LM3478 "simple switcher" from
    National. The datasheet description on that is vague, the WEBENCH tool
    at national.com is freaking useless. I can't model it in Spice since it
    is not clear how exactly the damn thing is supposed to work.

    The basic question is: what should be the slope compensation resistor
    value R if the intended duty cycle of the switch is D and the frequency
    is F? Everything else can be easily derived once this question is answered.

    I finally got it by trial and error. However do you know of any appnote
    or guide which clarifies this question?

    Vladimir Vassilevsky

    DSP and Mixed Signal Design Consultant

    http://www.abvolt.com
     
    Vladimir Vassilevsky, Nov 1, 2006
    #1
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