We are facing similar problem with the diode getting burned. We have several different boards using this device, some of them 10 years in production. The burn occurs at the customer. Our input voltage is 48V from backplane power supply, and the output current is ~100mA. The diode is rated for 100V.
1) I checked there is no over-voltage spike on the SW node.
2) It is schotky diode, I don't see dv/dt issues. The diode p/n is ON Semi (Fairchild) S100.
Can you help?
remark: dashed components on the schematic are not populated.