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TPS543B20: Output voltage oscillation issue

Part Number: TPS543B20

Hi,

Customer is troubled because TPS543B20 output voltage is not stabilized.
Could you check the attached waveform?

TPS543B20 wave form .pdf

I got the following question from a customer.

■Is pattern2 out put oscillating? And Is output stopped correctly with understanding OVP?

■When changing from pattern 1 to pattern 2, please tell me the reason for oscillation

■Duty is sparse in pattern 2. Please tell me the reason.

■Is the pulse skipping operation of pattern 3 normal operation?
 Please tell me the reason for pulse skipping.

Best Regards,
Yusuke/Japan Disty