BQ25896: bq25896 EMI

Ian Wang

Mastermind 28175 points

Part Number: BQ25896

Hi Sir,

My customer using bq25896 found EMI issue when charge active. (over 2dB, target is -4dB)

We try add snubber in SW pin but looks still fail.

Do you have idea how to reduce EMI?

Or do you have schematic for EMI solutions?

Thanks, Ian.

over 4 years ago

0 Jeff F over 4 years ago

TI__Guru**** 155706 points

Hi Ian,

The snubber has to be tuned to each PCB layout using empirical measurements. Below is a link to an appnote I wrote for sizing RC snubber for a boost converter but the same concepts apply to the buck. Attached is a presentation on how to reduce EMI for BQ2589x family.

https://www.ti.com/lit/an/slva255/slva255.pdf

6254.bq2589xbq2419x_29xlayoutandEMIrecommendation.pdf

Regards,

Jeff

Power management

Power management forum

BQ25896: bq25896 EMI