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UCC28780: startup issues

Part Number: UCC28780

Tool/software:

Hello.
I have designed an isolated DCDC converter using this IC and am testing it right now.
I'm asking this question because I ran into a problem during testing that I can no longer resolve.
In the startup sequence of the IC, I get the first pulse, but the next pulse is not output.
I have confirmed that Vcs has reached 0.28V and that the RUN signal is High.
Please let me know if there is anything else to check.

thank you.

C1: PWML

C2: RUN

C5: Vcs

C6: Current sensing shunt