My customer want to confirm how much pulse width "D" varies as Vfb varies. Is there any equation related between the two?
Thank you in advance.
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There is no graph or equation showing the relationship between COMP and D, it is different for each power applications and specs.
in below picture, the forward voltage of internal diode is Vfd, so the inverting input of the PWM comparator is (VCOMP - 2*Vfd) / 3,
when Isense pin voltage V_ISENSE hit the (VCOMP - 2*Vfd) / 3 , it turns off PWM output.