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LMR51606: Need to simulate % regulation for LMR51606XFDBVR

John Treubig
Prodigy 60 points
Part Number: LMR51606
Other Parts Discussed in Thread: LMR54406, LM2674

Tool/software:

Looking at the Webench design for LMR51606XFDBVR and not seeing a way to see the % regulation as Webench only provides  LMR51606DBVR.  How would this be handled?

Thanks,

John

  • 0
    TI__Genius 9460 points

    Hi John,

    Voltage regulation should be the same. 

    Regards,

    Rahil

  • 0
    Prodigy 60 points

    Thanks Rahil.

    It seems you are saying that the LMR5xxxx should exhibit the same % regulation.

    I have looked at a number of the LMR5xxxx datasheets and there appears to be a lack of consistency.

    I currently have a design using the LM2674 which states +/- 1.5 % regulation and I want to duplicate this.  The LM2674 suggests replacing it with the LMR54406 which shows to have +/- 1.5% regulation.  However, the LM2674 Recommended Operating Condition is 40V max and the LMR54406 is 36V.  They both retain the 45V Absolute Maximum.

    I asked the question about the LMR516 as it has a 65V Absolute Maximum, however the % regulation for the FPWM mode is not specified in the datasheet.  The LMR516 will solve all my problems if it maintains the 1.5% regulation.

    Hope this makes sense,

    John

  • 0 in reply to John Treubig
    Prodigy 60 points

    I have just found that the LMR514 has a Recommended Operating Condition is 42V max which support my requirements.  Just need to see if the % regulation for the FPWM mode maintains the +/-1.5% regulation.

  • +1 in reply to John Treubig
    TI__Genius 9460 points

    Hi John,

    I am saying that all LMR516XX parts will exhibit the same % regulation.

    PFM mode only affects light load which is where regulation will be the worst. You can read more about PFM mode on the datasheet. 

    Regards,

    Rahil