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TLV62569: 用TLV62569做1.2V和1.8V的buck电路，输入5V。1.8V的输出波形有明显的脉动，该如何调整

奇 朱
Prodigy 100 points
Part Number: TLV62569

用TLV62569做1.2V和1.8V的buck电路，输入5V。看规格书配的电感和反馈电阻，电容都用的220uF。但是输出的1.2V是直线（绿色），1.8V（蓝色）就有明显的脉动，增大电容和电感没有任何改善，请问改如何调整，为什么只有1.8V输出有问题