LMR51610EVM: Purpose of extra resistor and capacitor in buck feedback network

Oscar Walsh

Part Number: LMR51610EVM

In the LMR51610EVM, what are the purpose of R3 and C7? C7 looks like a feed-forward component, but why would it be positioned after R3, and what is R3 for?

Neither of these are in the datasheet, when should they be included?

Thanks.

7 months ago

0 Elena Gao 7 months ago

TI__Genius 13735 points

hi, Oscar,

Both is optional for typical circuit application ,you can choose to solder on board or not.

R3 is for loop test injection signal reserved. and Cff is also a place reserve for loop stability test.

Elena

0 Oscar Walsh 7 months ago in reply to Elena Gao

Prodigy 130 points

Thanks Elena,

So C7 is for testing stability? Or is it used to improve stability?

0 Elena Gao 7 months ago in reply to Oscar Walsh

TI__Genius 13735 points

Just reserve for adjust, in case inductor, Vout cap, Vout voltage or anything change.

you can remove it.

Elena

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LMR51610EVM: Purpose of extra resistor and capacitor in buck feedback network