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LM5576:请教输出问题



1、评估板的标准电路接法,电压反馈电阻有5.11K+1.65K改为14.7K+1.65K,即输出有+5V改为+12V输出;

2、输入24V,空载是输出不是恒定的12V,是周期性的由12.8V降到3.9V(周期为120mS左右)。

请问,是什么原因,多谢!

1738.LM5576 电路图和输出波形.docx