TPS56628EVM-534: Inquire snubber initial value to reduce EMI

user4773172

Intellectual 1410 points

Part Number: TPS56628EVM-534
Other Parts Discussed in Thread: TPS56628

Hi Sir,

May I learn from you about TPS56628 snubber value C8 and R5?

Now we would like to add snubber to reduce EMI, please kindly guide us about the initial value of snubber.

In addition, do you have other comment about how to improve TPS56628 EMI performence?

Thank you for your kindly help.

Edward Chen

over 5 years ago

0 Yuchang Zhang over 5 years ago

TI__Mastermind 18510 points

Hi,

Below link for snubber calculation reference, and as experience, generally you can try some value directly, such as 1~4.7 ohm+500pf~3.3nf, and then fine tune the R or C based on the sw ring.

Some others for EMI optimization:

1, Good layout, smaller loop, smaller SW area.

2, Use shielding inductor

3, input LC filter.

...

https://e2e.ti.com/blogs_/b/powerhouse/archive/2016/05/05/calculate-an-r-c-snubber-in-seven-steps

Yuchang

Power management

Power management forum

TPS56628EVM-534: Inquire snubber initial value to reduce EMI