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WEBENCH® Tools/LM2775: LM2775 WEBBENCH BOTTOM PCB LAYOUT

Part Number: LM2775

Tool/software: WEBENCH® Design Tools

HI,

I would use LM2775 device, and if simulating webench, there is cut-out in the  pcb bottom.

if pcb is 2 layer(top/bottom side),  cut-out is below picture.

but, if i use 10 layer PCB,  is cut-out  all layer??