Part Number: LM5180EVM-S05
Hi, I'm laying out a virtual copy of the EVM board and wanted to ask why there is no top copper under the transformer? I assume it is to reduce noise coupling into the ground or traces, but there is still a ground on the bottom of the board which is only 1.6mm away, which would pretty much negate any gains made by removing the top copper???
Also the EVM has a 1nF cap bridgeing the primary and secondary grounds. No mention of it in the data sheet. ??