Hi all:
设计原理图 schematic diagram:

PCB图片:

示波器图片 image signal on oscilloscope:

我需要大家的帮助,感谢!
I need your help and advice.
Thank&Regard
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Hi all:
设计原理图 schematic diagram:

PCB图片:

示波器图片 image signal on oscilloscope:

我需要大家的帮助,感谢!
I need your help and advice.
Thank&Regard
Hi
纹波偏大首先要确认环路补偿,这款芯片如果你采用上面的电路,则是利用芯片内部的补偿,此时要求搭配外部的合适的输出电容(容值和ESR必须合适,不能选择低ESR陶瓷电容,按照datasheet要求选择ESR不能太低)。如果输出电容达不到要求(选用低ESR陶瓷电容),则需要额外的外部补偿。