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LMG5200: HI/LI Input Filtering

Kiron Sen
Prodigy 60 points
Part Number: LMG5200

I am driving an LMG5200 from an FPGA at ~40kHz, but plan on supporting more extreme duty cycles, getting closer to MHz switching.

I noticed that the LMG5200 reference design uses RC low-pass filters (20R, 47pF) at the HI/LI inputs. I am using a ADuM260N digital isolator with hysteresis to drive the HI/LI inputs, so I don't think that an RC low-pass will benefit my system as much. Instead, would 1k resistors from HI/LI to GND improve signal integrity, or are there other factors to consider with the LMG5200?

  • 0
    TI__Genius 16390 points

    Hello Kiron,

    Thanks for reaching out to us and sorry for the delayed reply. Could you elaborate on the point that the RC filter is not beneficial for the IN pin in your circuit? Although there is isolator used, the RC filter could still filter out the noise travels from the isolator to the pin of LMG5200.

    Regards,