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lm5175 mosfet

Other Parts Discussed in Thread: LM5175

Hi, 

I am designing a solution for a customer based on the LM5175. the design specs are 10-28 VIN _ 19.5VOUT / 3.5A

i have two issues:

1. i am getting relatively pure efficiency (85%) and i have excessive current draw (150mA) at no load and switching noise. i have attached the schematics Although i could find any problems with it

2. is there any issue using the same mosfet for all 4 switches? i am using PSMN1R4-40YLDX from NXP. 40V 100A 1.4mOHM 1.7V gate threshold 

Thanks

LM5175.pdf