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TPS54202DDCR 纹波问题

Other Parts Discussed in Thread: TPS562201, TPS54202

使用TPS54202DDCR ,输入18V,输出1.2V给主芯片内核,发现纹波异常很大,约两百多mV。要求纹波在70mV以内。尝试换不同电感和输出滤波电容,无法改善。。。。。另外发现电感选越大,纹波反而越大,用2.2uH反而小些。这个是什么芯片本身缺陷吗