LM3481 SEPIC compensator loop

I am designing a sepic converter with input voltage from 9V to 15V and output voltage of 12 V and 3A. I understand how to design almost all the elementes of the sepic converter but there is no information in the datasheet about how to design the resitor and the capacitors of the compensator loop. I read the document ¨AN-1484 Designing A SEPIC Converter ¨ and they use a the current sense gain (Gcs), but that parameter do not appears in the LM3481datasheet. Can someone refere to me so tome document or aplication with information obout this? or about sepic converters? Thanks