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您好,
请问是否确认powerpad焊接没问题。另外C9,C18都需要布局在最靠近芯片处,否则容易引入干扰。
还可以用webench仿真工具试一下这套参数是否有问题,谢谢
http://www.ti.com/lsds/ti/analog/webench/overview.page?utm_source=GOOGLE&utm_medium=cpc&utm_term=webench&utm_campaign=POW_GEN_WW_N_E_Webench&utm_content=af69bb07-69fa-46a3-a98d-415cf5a3eb15&gclid=CMG3kcDundICFUJ_vQodpwcPyA
Regards,
Patrick
可以试试在反馈脚对地加一个10pF的电容,看看是否有改善。另外反馈脚的上下分压电阻太大了,导致电流很小,很容易收到外界噪声的干扰。建议缩小10倍