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LM25149-Q1EVM-2100: Output voltage ripple in PFM mode

Part Number: LM25149-Q1EVM-2100

Hi support  team:

when system output 3.3V/1A, I tested output ripple is 280mv(output capacitor is 188uF ) in PFM mode.

I think this voltage ripple is too large, could you please tell me what is the ideal voltage ripple in this case?

in addition, I want to know if this large ripple is inevitable and how can reduce this ripple(except increase capacitor) ?