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TPS54302: light load transition

Part Number: TPS54302

Hi team,

A customer is testing TPS54302 in their system and got a waveform as below.

I'm thinking the device entered light load mode and skipped some pulse when the inductor current drops. But the strange thing is the threshold of the light load mode is 500mA, according to the waveform the device began to skip  when the current is still larger than 500mA. Is it normal?