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I did a test board with the LT3990 similar to the "typical applications" on page 18 of the data sheet.

Vin 30 to 62V

Vout set to 24V instead of 12V / R1 = 1M / R2 = 53k6

f = 1MHz

C3 = 0.1uF

L1 = 33uH / 0.5A Type WE 744 383 353 30

Device runs perfect with load up to 150mA

Output Short Circuit protection work perfect!

Problem: if I increase the output load current, the LT3990 become damaged.

What can be wrong in this configuration?