As a rookie college student, I wanted to know the calculation.This is a formula that appears in Application Note:AN1089 of L6561.

I don't know how to calculate the value of Vcomp, and I don't understand the function "root( )"

I would like to express my sincere thanks to all of you.

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Visitor II

Hello @嘉鸣欧 ,

root() is the root of the equation with Vcomp the variable, meaning the value(s) of Vcomp for which the equation evaluates to zero. Otherwise, Vcomp is the (amplified) error signal (output compared to target: https://en.wikipedia.org/wiki/Control_theory#/media/File:Feedback_loop_with_descriptions.svg):

Best regard,

@SBEN .2

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