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UCC21750-Q1: UCC21750-Q1 FLT issue

Part Number: UCC21750-Q1

Hello,TI expert:

I encountered a problem when using UCC21750-Q1. The FLT-Pin was pulled low unexpectedly, but Desat did not have any voltage exceeding 9V.

I don't understand why, this is inconsistent with the description in U'CC21750Q1s specification sheet.

Could you share your suggestion ?