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LM5175: Super light load behavior

Part Number: LM5175

Hi Team,

I am using the LM5175 as a buck-boost convertor. The most common operation scenario is 12Vin and 30Vout with no load. What I found is the output voltage is up and down. It will reach to 30V and then super slowly go down to 20V and charged to 30V again. The output capacitor is huge (10mF) in our application, working as an energy bank. Any idea how to reduce the voltage up and down? My thought is that completely eliminating the up and down is not possible, but is there any method to reduce the amplitude? It will be wonderful if I can make it up and down between 27V and 30V.

Thanks,

Yu