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Mosfet N breakdown

Hung Pham
Prodigy 10 points
Part Number: LM5149-Q1


I describe the phenomenon I encountered:
 
- Input: 30V
- Output: 12V
- When I don't load the output, everything works normally
- After I tested the output capacity of 12V-3A, mosfet Q1 was broken, causing V-IN to connect to V-Out.
I will attach my design at the below.