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Problem in an equation derivation

Category: Datasheet/Specs
Product Number: LT1509

Hi,

I have just derived the equation of the error amplifier output voltage required at the input of the multiplier for the LT1509 Average current mode PFC controller, for a 1000W PFC.

Going through my derivation, I reached the same final value written in the datasheet at page 9, but the only difference is a +2 added in the datasheet where I am confused how did it came up to the equation.