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LM3481: Power solution problem in LM3481

Part Number: LM3481

Dear team,

The 12V voltage supplies power to VIN through 10Ω and the magnetic bead. When the 12V power supply jitter is negative, it is found that pin 10 does not become negative.
Question 1:
Is there a device similar to a clamp tube in the 10-pin?
Question 2:
For the current circuit, how much negative power supply jitter might be at risk?