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TPA3138D2: SD/FAULT pin operation

Part Number: TPA3138D2

Hi team,

Does the SD/FAULT pin need to be High at the same time as the power supply?
If I set it low and then turn on the power supply, the SD/FAULT pin will go high for a moment every 1.6s.
If it is set to High at the same time, it works fine.
Are there any possible causes?

Best,
Ryu