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WEBENCH® Tools/TPS56339: TPS56339

Ma Maxim
Prodigy 75 points
Part Number: TPS56339

Tool/software: WEBENCH® Design Tools

I designed  TPS56339DDCR  ‑  24V to 5.00V @ 3A with WEBENCH. But i found the tps56339 would be damaged when the input is  above 18V .Both the VIN pin and SW pin short-circuited to GND when the tps56339 is damaged.Could you give some advice please? thank you very much.