Exactly !!! Love your 'finding their own way back' comment - this is exactly what gives so many SMPSes a bad name. If you do this then it's (usually) fine to ground fill the top and bottom, provided the ground fills go back to the same place. But remember this single point of connection to the main ground must be really solid. Don't then feed it through 10mm of 25mil track :-)plushterry wrote: ↑Wed Feb 17, 2021 4:01 pmThat is really really helpful thanks!
so you're sort of funnelling all the grounds from the switcher together and sending them back to the main ground as one, rather than letting them scatter out and find their own way back.
I like the AM radio trick, will defo try that.
Bare in mind with the right inductor and capacitor values you can even sometimes lose the regulators in many applications, but best to leave that for your next design.