The current limit is 5.5A +10% (or so for margin, this is ABS MAX CURRENT DRAW), I don't know if that is high for you, but that is in the spec. I can't do anything about it. The 10A is a test parameter. I simply set the current draw of the e-load to 10A.
The snubber values are made (originally to R=4.7ohms, C=1nF) so that they follow that conditions (actually, I read that appnote you linked even before you posted it, among many other appnotes and datasheets). The values seen on the pictures I provided are actually updated to the last test I made (because of the reasons I previously stated). And yes, I tested the original values initially.
Did you do the test I suggested, where you connect the oscilloscope ground clip to circuit ground and then observe the voltage on the ground with the probe?
Sorry, I haven't done this yet since my board was destroyed and I haven't fabricated another (hopefully tomorrow I already have another one).
Does circuit ground mean power ground? Well, the circuit only have one ground. But what does "
observe the voltage on the ground with the probe" mean? Where do I probe it?
The waveform above is measured at the output. I don't have any filters (like pi filters, since I don't understand them yet) at the output, so that waveform is measured at the inductor output WRT ckt ground.
I also remember measuring the MOSFET output (but I forgot to take a picture), There is also ringing there (switching from negative to Vin as it should + ringing).
I'd like to test more but my boards were delayed so much because of the Chinese new year. Just ranting.