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TPS63020输出电压波动较大且呈现锯齿波

Other Parts Discussed in Thread: TPS63020

使用TPS63020芯片,输入3.7-4.2V电压,要求输出3.7V/4A,3.7V能够稳定得到,但是有200mv的波动跟做仿真的时候是一样的,但是其呈现锯齿波,在接入负载后波动变大,请问这是什么原因