LM5176: VIN=12V, Io=3A的时候会出现次谐波震荡

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nles1214：

补充说明：输出电流Io=2-3A的时候出现这种现象，电流越大越明显。

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Johnsin Tao：

HI

   从你描述看应该是输出和输出较为接近时，芯片在topy转换时出现混乱导致驱动异常，建议你确认输入，输出是否稳定？ 如果是不稳定一般是因为layout造成的，建议严格参照datasheet说明layout。

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nles1214：

Hi, Johnsin, 输入和输出电压都是稳定的，而且Io=2A的时候也比较正常，就是Io在增大到2.5A~3A这个区间，会出现这个大小波。3A的收效率也有94%左右。Layout就是参照Datasheet做的。

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Johnsin Tao：

Hi

    问题仅出现在Io在增大到2.5A~3A这个区间，  3A以上，2.5A一下都是正常的吗？