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LM25149-Q1: Input power failure and output abnormal

Part Number: LM25149-Q1
Other Parts Discussed in Thread: LM25149

Hi support  team:

I am testing LM25149 EVM and I found the output will have several waveforms that repeatedly start up when input power down.

input: 6.6V

output:3.3V/6.5A

en pin voltage around 1V

if input increase to 13.5V, output also has repeatedly start up waveform.

could you please give me some advice?