In the design scheme TIDM02010A of TI's 1.5kw compressor, I noticed that the power ground PGND was not completely isolated from the signal ground GND. However, the power supply design scheme already used a flyback power supply, which is a power supply with isolation function.
The schematic and PCB both show that these two grounds are connected by a piece of copper. Shown as the belowing pictures, and my question is, can I remove this copper, to make the PGND and GND are totally isolated?