I recently made a board that takes 10-24 V in to 12 volt out. It worked, but Recently I took the same board layout and put it on a bigger board, and the output now breaks down at 2.5 amps.
Here is the Voltage waveform when trying to pull 2.5 Amps:
Here is the schematic and pdf of top and bottom:
Sorry if it is difficult to read.
Bottom: PSWP-ForkedPower.pdf