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怎样通过输出纹波来判断环路补偿不足还是过多?
可以通过观察负载瞬态变化时输出电压上的波形来判断。
电压振荡回复的越平缓,相位裕度越大(即过补偿);瞬态时候振荡越多,补偿越不足。值得注意的是这里看的是振荡回复的形状而不是时间,回复时间主要由大信号相应以及小信号环路带宽决定,而振铃的形状才反应了相位裕度。
谢谢~