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TPS28225的输出纹波很大

Other Parts Discussed in Thread: TPS28225

关于TPS28225驱动mos管的BUCK降压电路,出来的纹波现当大,有600mV的纹波。不知道如何解决。我输入电压DC20v,输出DC15V,输出电流2A时。PWM用单片机来出来,电感是300uH的铁硅铝。输出电容2个470并联和外加104两个独石电容。求各位大神指导。谢谢!