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LM25085A: Switching behavior at high duty

Kaji@PAN
Mastermind 7805 points
Part Number: LM25085A

Hello,

I would like to ask you a question about the LM25085A device.
The figure below shows the switching behavior when VIN is changed.
Set RT=330kΩ.
It looks like normal switching at VIN=17V.
At VIN=14.9V, switching may turn off momentarily.
Is this behavior normal?
What are the probable causes of the anomaly?

Best regards,