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LM5119: Rsense minimum value for application

John Chou62
Intellectual 1960 points
Part Number: LM5119

hi Team,

my customer is testing the LM5119 for LEV product

with Vin 25V Vout 12V Io ~ 25A

it seems when they use smaller Rsense it would observe ringing issue and become unstable.

the R sense is ~ 1.5mohm.
we'd like to check if there is a limit on how small the Rsense requirement for the LM5119?

Thanks for the help

  • 0
    TI__Genius 11095 points

    There should not be a hard limit as such. You just need to make sure there is good signal to noise ratio, and the loop can be stabilized with the type II compensator mentioned in the datasheet. Hence the current signal after the sense gain of 10 should be much larger than the ramp signal.