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LM5177: The relationship formula between Duty1, Duty4 and input and output

Allen Lu
Intellectual 2470 points
Part Number: LM5177

Hi team:

 My customer target to use LM5177 for IND power module:

 

DC: 9~60Vin, 0~60Vout, with 20A at 1200W.  May need two modules connected in parallel and each module outputs 600W.

 

base on the buck - boost model as above. The duty cycle of the G1 will affect the inductor peak current, We currently selecting an inductor, but I don’t know the duty cycle of the S1. 

and customer will have external input current limiter circuit, so the actually production do not need high peak current `s inductor.  would you help to share the relationship formula between Duty1, Duty4 and input and output?

tks again.