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XTR111引起电源纹波变大

Other Parts Discussed in Thread: XTR111

调试XTR111的时候发现电源被串进了270mV左右的纹波,频率在200多Hz,断开电流环,电源模拟带载100mA左右看纹波也是正常的,只有50mV左右。为什么电流环导致电源的纹波变大?

有什么建议?