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LMR16030: LMR16030, Cff capacitance and output ripple problem

Part Number: LMR16030

Hello! We use LMR16030 to supply 18-30vac after half-wave rectification and then connect it with 2200uF filter to form DC. As the input of LMR16030, the output is the maximum 2A of 5VDC. The Cff capacitance of the output terminal is recommended to be 470pF or 560pF when calculated on the official website. However, in the actual test of each waveform of load 0~2A, it was found that when 470pF was used, the ripple output of 5V was up to 300mV, while when 12pF was used, the ripple output was within 60mV. Why is that?Are we at risk of using 12pF?