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规格书中为什么频率误差范围这么大？ 有么与频率相关的参数也会有很大的误差，比如纹波，
HI
主要的原因应该是芯片内RC电路中的电流源精度不高，尽管频率有10%左右的tolerance， 但是环路温度的裕度范围也很大，所以不会影响到纹波。
