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LM2991的电路问题,求TI员工看看,有原理图、PCB、波形图

Other Parts Discussed in Thread: LM2611

电路图:(C1为10uF/35V的钽电容,Cout暂时没接)

输入:-5.5V直流(由LM2611供给,已由两个220uF钽电容滤波)

输出:预计为-5V,但是空载为下面的波形(平均值为-4.92V,但是有个1.24Vpp,335kHz的分量)

这个正常吗?即使没接输出滤波电容也不应该有这么大的一个交流分量啊~~


附PCB:

1.Top Layer

2.MidLayer1

3.MidLayer2

4.BottomLayer