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LM5149: Paralleling Converters & PG Pin Functionality

Keith Keller
Expert 6500 points
Part Number: LM5149
Other Parts Discussed in Thread: LM5148

Hello,

Is there any issue with paralleling multiple LM5149 in parallel with the Active EMI Filter active?  We're considering having up to 4 in the system running at the same time.

Is it true if we synchronize devices 180o Out of Phase, that PG will never go high?

Thank you, Keith

  • 0
    TI__Mastermind 28660 points

    Hello Keith,

    For parallel operation suggest using a single LM5149 with LM5148's.  This would be quite tricky to implement due to layout.  I advise just using LM5148's with Passive filtering.  you can choose to stagger the clock evenly across the 360 degrees but will need to implement the correct timing.  

    hope this helps.

    David.