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LM3409HV: Inductor Current Ripple

T Kishi
Genius 4425 points
Part Number: LM3409HV
Other Parts Discussed in Thread: LM3409

Hi

My Customer has question.

Evaluation is done with LM3409 HVEVM.
I confirmed that ON time fluctuates for SW waveform.

Please see the attached file.

LM3409_Ripple_OnTime.pdf

It works like the data sheet [Figure 24.]、Is no problem in recognition that "the ON time will change"？

Regard

T Kishi

  • 0
    TI__Mastermind 25500 points

    Hello,

    That is how the part is intended to operate, there is no problem with the ON time changing. As explained the polarity of the current sense comparator swaps each cycle. This is to remove the input offsets of the comparator and improve accuracy.

    Best regards,

    Clint