TPS54331: Collocating two buck converters with same switching frequency

Andrew Loomis

Part Number: TPS54331

I am thinking of using two TPS54331 buck converters to output 3.3V and 5V, but they have the same 570kHz fixed switching frequency. These regulators will be side by side, and I'm wondering if there will be any radiated/conducted EMI problems with this.

over 7 years ago

0 Jason Wang (BSR-MV) over 7 years ago

TI__Genius 9550 points

hi,

I am looking into this question, and give you feedback within 24 hours.

0 Ryan Hu (BSR-MV) over 7 years ago

TI__Expert 4035 points

Hi,

Hard to give an exact answer Yes or No, but your concern is necessary from system side, suggest to follow the guideline of datasheet when drawing PCBlayout, suggest to add a 0-ohm res in series with the Cboot in case of having to adjust the slew rate of internal MOSFET.

Ryan Hu

Power management

Power management forum

TPS54331: Collocating two buck converters with same switching frequency