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LM5017: Soft start unstable

Part Number: LM5017
Other Parts Discussed in Thread: LM5107

Dear Team,

We want to implement the soft start circuit here.

But we are not sure why the Vo is not stable.

Base on the waveform, the issue is Vcc didn't regulate at the voltage which defines on the datasheet.

Do you have any ideas what is the root cause?

BR

Kevin