TPS5410-Q1: Switching regulator conducted noise

Hi Jim,

Normally TI has some FAE associated with an account to help support the customer.

As for your issue,

1) Could you also check the switch node and make sure that it is not jittering since i see the sideband in there

2) You can also use a snubber network across the diode to slow down the rising edge of the SW node and reduce this spike

Here are some article on it

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

https://www.electronicdesign.com/analog/how-control-emi-synchronous-buck-converters

You can try the above method and see if it reduces your noise level 

Thanks

-Arief

There is no jitter on the switch node. The square wave does have some ringing, but any snubber networks that I try have no effect. The articles above are for a different switcher. Is there one for the TPS5410?

Hi,

Do you have the layout of the device?

Could you add a ceramic capacitor 4.7uF close to the VIN pin and see if the noise improves?

how much ring do you have on the PH node?

Thanks

-Arief

Hi,

I believe that you are in contact with our FAE and offer you some better selection of our parts in respect of EMI

For now i will close this thread. Let me know if you have any further questions

Thanks

-Arief