LMR43620-Q1: Dumping Resistor

Youhei Miyaoka

Expert 3995 points

Part Number: LMR43620-Q1

Tool/software:

Hi team,

My customer ask me about dumping resistor between BOOT and C1.

Does TI recommend this dumping resistor? If yes, please also teach me recommended values.

Regards,

Youhei MIYAOKA

2 months ago

+1 Pramanik Patel 2 months ago

TI__Expert 4545 points

Hi,

Generally Damping resistor reduces the slew rate of the SW node and thus reduces the swinging at SW node. Since slew rate of SW nodes reduces, this directly hits on the efficiency. Adding a RBOOT will help in improving EMI performance. You can start with putting a 2.2Ω, see the reduction in the efficiency and improvement in EMI, if it doesn't satisfy, try increasing the RBOOT and check the efficiency and EMI performance. Repeat the above by increasing RBOOT till the results are satisfactory.

Thanks,

Pramanik Patel

0 Youhei Miyaoka 1 month ago in reply to Pramanik Patel

TI__Expert 3995 points

Hi Pramanik,

Thank you for your careful explanation.

Regards,

Youhei MIYAOKA

0 Pramanik Patel 1 month ago in reply to Youhei Miyaoka

TI__Expert 4545 points

Hi,

Let me know if you need further assistance.

Thanks,

Pramanik Patel

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LMR43620-Q1: Dumping Resistor