Component values on 2-pole 2-zero compensation

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TheDannia

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Hi guys,

I'm trying to build a 2-pole 2-zero compensation for a full bridge dc-dc converter. I'm using sg3525 as IC.
To build the compensation network I'm following the instructions on power supply cookbook but there are two resistors which I don't know how to calculate these 2 resistors and the book isn't showing also.
 

For practical purposes, the transfer function of this circuit is simplified to the op amp inverter topology, so the gain would be defined as ((1/sC2 + R2) // C1) divided by ((1/sC3 + R3) // R1).
For sure, too much algebraical handling should be made to factorize polynomials from numerator and denominator into the form (s+z1).(s+z2)/(s+p1).(s+p2).
 

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