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LM5025: Abnormal oscillation caused by overcurrent detection of CS1 pin

Part Number: LM5025

Hi,

I am studying a circuit using the LM5025 device.
In my circuit, when the overcurrent is detected by the CS1 pin, the switching frequency becomes abnormal.
This phenomenon occurs when the input voltage decreases (17 V or less).
So I don't think it's the RAMP pin effect.
What is the cause of this abnormal oscillation?

Best regards,