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WEBENCH-POWER-DESIGNER: LM5116 can't update the MOSFETs in the design

Part Number: WEBENCH-POWER-DESIGNER
Other Parts Discussed in Thread: LM5146, LM5116

Hi, 

I have a design that i am trying to change the predetermined MOSFETs for. I have had a case where when I change the top fet the bottom one is changed to be the same one as well. I have tried re launching the tool and I am finding that when i update the bottom fet, instead it updated the top one and the bottom fet stays the same. Can you help me understand what is going on and how I can update the values of both fets independently?

Thanks, 

Jose