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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

    Vladimir Vassilevsky, Nov 1, 2006
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