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LP2997输出纹波并发热问题

Other Parts Discussed in Thread: LP2997

CPU使用的是MCF54418,VTT利用LP2997提供,测量出VTT的输出电压纹波较大,幅值约400mv,并伴随发热。

后来将C58(本来为10uf瓷片电容)并了3颗10uf电容,问题解决。

但是SPEC上面写的Ceramic capacitors can also be used. A value in the range of 10 µF with X5R or better would be an ideal choice.,原来的10uf应该也是足够的。请问问题的原因是出在哪里??

SD_VTT波形: