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LM5020 Slope Compensation calculation formula

mars chuang
Prodigy 130 points
Other Parts Discussed in Thread: LM5020

Hi TI teams 

Excuse me ,  I would like to know what is LM5020 Slope Compensation calculation formula.

I can not find calculation formula in the datasheet.

Thanks.

  • 0
    TI__Mastermind 26620 points

    Hi Mars,

    The LM5020-1 has internal Slope Compensation and really is the only IC that will require Slope compensation.  It has a 50uA current source and a 2k resistor which give a Vslope of 0.1V.

    I am assuming you are using this in a Boost, I could be be wrong, but as an example allow me to elaborate.

    The Vslope should equal the inductor up slope and the down slope scaled by the current sense gain.  The current sense Gain on the LM5020 is 1 (no current sense amplifier per se).  so the calculation would be the following for a boost.

    ((Vout-Vin)*Ri)/(Lboost*Fsw)=Vslope

    Where Ri in the case of the LM5020 is Rsense (which is your current sense resistor value)

    Seeing as we have a Vslope internal of 0.1V you can subtract this from the Vslope you just calculated.

    I hope this helps?

    David Baba.