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LM5175-Q1: About transient spikes upto 200V

Part Number: LM5175-Q1
Other Parts Discussed in Thread: LM5175EVM

Hi 

I am a beginner in the power supply design field. I've read in one of the forum that the transient spikes on automotive might go up to 200V. But the automotive transient profile (from buck-boost regulator benefits automotive conducted immunity) doesn't tell anything about 200V. I don't know whether the information about the transient is correct or not. Can anyone help me to choose LM5175-Q1 in my application?

Can I use the same typical application values (in the datasheet) for my application?

Can I use BUK9K35-60E as a buck FET and BUK9k18-40E as a Boost FET? 

One more question is can I use four layer board for my application?

Could you please guide me in the right direction

Thanks in Advance