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TPS56121输出1V给c6678供电

Other Parts Discussed in Thread: TPS56121

我5V输入给tps56121,输出给1V给dsp,但是出现5V的纹波高达2V,是由于tps56121电路造成的纹波。求助。

ps:我昨天发了类似帖子,附件原理图,好像被管理员删了,不知为何?