TPS54821 minimum FB current

PAN-M

Mastermind 8375 points

Dear all.

Do you have the minimum value of FB current?
It's because our customer consider the smallest resistance value of FB.

Regards,
PAN-M

over 9 years ago

0 Nick Chen over 9 years ago

TI__Prodigy 575 points

Hi,

there's no minimum value for FB current in the datasheet, i suggest you stick to the values in the EVM user's guide.

0 JohnTucker over 9 years ago in reply to Nick Chen

TI__Guru**** 191445 points

Small resistor values will result in larger current in the FB resistor divider.

0 PAN-M over 9 years ago in reply to JohnTucker

Mastermind 8375 points

Jhon

There is also the device which indicates the smallest current by datasheet.
Our customer would like to choose the biggest resistance value.

For example, is the resistance value of the total 1Mohm also OK?

PAN-M

0 JohnTucker over 9 years ago in reply to PAN-M

TI__Guru**** 191445 points

I have not tried anything that high. It may possibly be noise sensitive. I almost always use 10 k for one resistor and calculate the other. I would think 100 k or 200 k would be safe though.

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TPS54821 minimum FB current