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LM5170-Q1: nFault Signal

Part Number: LM5170-Q1
Other Parts Discussed in Thread: LM5170,

Dear Ti expert.

Hello, I would like to ask about the nFault signal of LM5170 IC.

Do I need to add a pull-up resistor to the outside to activate the nFault signal?

Currently, it works when nFault is disabled, but it does not work when enabled.

Actually I don't know why nFault signal is dropping.

Thank you.