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SVA LM5010A question

Adam Ngern
Prodigy 20 points
Other Parts Discussed in Thread: LM5010A, COT

Hi there

i have a customer using LM5010A, they have some questions as follows from the EVM provided to them.

1.)    Ripple Reduction Option B as in National Semiconductor AN-1423. How will R6 and C9 reduce the output ripple? Will these values (including C10) change the converter’s stability?

2.)    Why R2 and R3 are to be increased?

Thank you in advance

Adam

  • 0
    TI__Genius 11490 points

    Hi Adam,

    1. R6 and C9 generate an artificial ripple that is fed to the FB node through C10. As there is no R4 needed (zero OHM), this configuration reduces the ripple at the output. In the absence of any series resistance (R4), R6, C9, C10 are needed for stability in a COT converter.

    2. The parallel combination of R2 and R3 forms a divider with C10 which reduces the ripple magnitude at the feedback node. Hence R2/3 are increased.

    Thanks and regards,

    Vijay