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LM5175: LM5175 Issues with MOSFETs

Part Number: LM5175
Other Parts Discussed in Thread: CSD19538Q2, CSD17571Q2, , LM5176

Hi , 

Please see attached simulated design using Webench for Lm5175 . On our board we changed the FET on Boost side from CSD19538Q2 to  CSD17571Q2 and the system has stopped working. Vref is measured between 800 to 940 mV . PGOOD is like a square wave. Switching all the FETS is off too. I am attaching webench design to understand what would cause this issue. Also some screen shots are attached. another difference from Simulation is that we have DMC mode with no hiccup. We need to get more current for USB type C and that is why we made this change8764.LM5175_simulation.pdf