Tseng,
There are many different types of "noise" that may occur in a DC/DDC switch mode power supply.
Can you please provide some more details on your design and what type of noise you are seeing?
These are some of the basic items I will need…
Liban,
I attached one example on FPD-Link's power supply design which shares the same design as UB960 for your reference.
https://www.ti.com/tool/PMP9758?keyMatch=power supply noise filter&tisearch=Search-EN-Everything#technicaldocuments
pls note…