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AN149 from figure 10 to equation 5?


I have a stability issue with a LT3479 SEPIC circuit.

Before trying to solve my issue, I am reading the AN149 (about Modeling and Loop Compensation Design of
Switching Mode Power Supplies) and try to understand how you get to equation 5 from figure 10?

I have tried to solve for Gdv but do not get the same result as Equation 5.

My Gdv transfer function still has the DC average inductance current IL in it and I don't understand how to get rid of it to make it look like eq.5?

Would anyone have some additional steps from figure 10 to equation 5?



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