Question about the output of LTM8055 with no load condition

Hello,

My customer are considering to use LTM8055 and checking the performance of LTM8055.

During test, they find strange output at no load condition.

1). Would you check below output waveforms and let me know your opinions about Ripple noise at no load?

1. Output with Ripple at no Load

2. Normal waveform: with (A Load, V36P (output Voltage), V12P On

2)  About above ripple noise, this noise can be found at LTSpice simulation.

   Would you let me know the reason why this ripple noise is occurred?

Regards,

Se-woong