TPS54560: EMI issue

Hi Henry, 

Just looking at your schematic, the amount of capacitance on VIN is quite low. Try adding more capacitance and a high-frequency cap of 0.1uF placed as close as possible to the VIN pin.  

This might be some ringing on the switch node but this typically will have higher frequencies. Can you provide a scope shot of the SW node?

You can check your schematic with the information of this application report:

https://www.ti.com/lit/an/slyt465/slyt465.pdf

A snubber circuit can be added to reduce the ringing on the switch node. Here is a link on how to add a snubber circuit:

https://www.ti.com/document-viewer/lit/html/SSZTBC7

I assume this is conducted EMI - is this on the input?

Ben

Hi Henry,

Are there any updates?

Ben

Hi Sir,

I assume this is conducted EMI - is this on the input? => Yes, it's input.

Can you provide a scope shot of the SW node? => It's waiting for customer provide the files scope shot.

May I know the TPS54560"B" if it can fix this EMI issue?