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TPS54319: TPS54319 is question about output voltage is oscillating.

Part Number: TPS54319

Dear support member,

My customer used TPS54319.

I have a question.

The RT / CLK signal was input to the IC before the output voltage rises.
Output voltage was 200mV of oscillation was generated while the output voltage rises.

Switching waveforme is not synchronization with RT/CLK.
RT/CLK is 470kHz.
RT/CLK voltage is 4.8V.

Input voltage:5V
Output votlage:1.8V
Output current:1A

Is it possible to do external synchronization at start-up?

What is there think of any cause?

Best regard.
Bob Lee.