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Driving LMR62014 with LM5010A

Jeff Tooley
Prodigy 70 points
Other Parts Discussed in Thread: LM5010A, LMR62014

My design currently links the output of the LM5010A to the input to the LMR62014 as shown in the schematic snippet attached. This topology seems to work well using the evaluation boards. However, I am concerned about the LM5010A's specification concerning minimum output ripple voltage (and minimum ESR through the output capacitor). If TI can critique this topology and provide guidance on the reliability of this topology, and whether any layout considerations are needed to make a more robust design (e.g.locate C56 a minimum distance from C13/R54) that would be appreciated.

LMR62014.docx
  • 0
    TI__Genius 11490 points

    Hi Jeff,

    If you want to bypass the output of LM5010A with another capacitor (C56 for example) then it is recommended to use type III ripple injection circuit instead of R54 and C21. This is because C56 may eliminate/suppress the ripple produced by R54. This is explained in LM5010A datasheet (Figure 17. Low Output Ripple Using Ripple Injection)

    Thanks and regards,

    Vijay