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LM3429-Q1 design for Buck application

brian huang1
Prodigy 110 points
Other Parts Discussed in Thread: LM3429-Q1, LM3409HV-Q1

Hi Sir, 

below is my conditions for design of LM3429-Q1. I just used WEBENCH for calculation, but it always showed the result by buck-boost topology. how can I setup it to obtain the result by buck topology, thanks. 

Vin = 48-60VDC, 

Vout = 42V with 3.15 current rating,