We did a PCB using the webench results (attached file), with the Vishay Dale IHLP2020BZER6R8M01 instead of the Bourns SRN8040-6R8Y. (This point was the subject of another post).
The output voltage is ok (12.6V) @ no load, but it's decreasing when output current becames higher than 60mA. It's only 5.5V with a load that should draw 0.5A .
Do you have an idea of what is happening?
Here a a view of the pcb (double sided) and the webench results: