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when we play music, the ripple of PVDD as below waveform show, the frequency seems as internal switch frequency(2.1MHz), is it normal? the peak-peak voltage can reach to 100mV, if we can reduce this peak-peak value by any mothed?
上述纹波看样子是负载随控制开关来回切换产生的电压降,建议加100uF储能电容看是否有改善?
不建议这样做,电感会阻碍电流的流动,使得负载跳变时电压不能及时响应 ;另一个问题是这可能引起前端供电电路的稳定性问题,因为LC会增加供电电源系统的极点,影响电源系统的控制环路,需做稳定性分析,具体建议您咨询“电源管理”版块的电源工程师。