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TPS43060 - BOOT pin shorted to Ground

Hello

We are facing a problem that the boot pin of TPS46060 shorted to ground when plugged in DC source (Vin = 35V) directly, in the meantime, we set the enable pin of the boost controller low, no any output (Vout design is 51V), only inject input voltage.

We have checked design, there are accepted and under recommended operating condition Vin < 38V.

Did you ever seen the problem before? Do you have any idea?

Thanks,

John