I recently got around to trying out buck regulators, my results weren't what I was expecting though. For one the ripple voltage seems a little high to me, It's about 800mV with no load and goes up to 4.5V with a constant 1A load. In fairness it's only short spikes that create this ripple. Here's a capture of the regulator with no load:
At 1A the output voltage drops about 100mV and the voltage spikes get fairly big:
I'm using the XRP7664 in the setup given in the data-sheet but changed the output voltage to 6V (Schematic on page 1 with R1 changed to 56k). The circuit was built on a breakout board and connections made with wires. My question is this: Is this normal operating behavior for a buck regulator?
R1 changed to 56K