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Original question:

PMP20859: Questions

PMP20859: Questions

Sith Domrongkitchaiporn
Prodigy 50 points
Part Number: PMP20859
Other Parts Discussed in Thread: TPS2372

Hi,

I would like to ask why R35 is configured to 27.4k ohms? This contradicts the TPS2372 datasheet which recommends 24.9k ohms.

Thank you,

Sith

  • 0
    TI__Intellectual 2350 points

    Hi, Sith,

    The half FET bridge on page 1 has resistor dividers (R3/R8 for example) driving the low side FETs.  These resistors draw current during detection and appear as an impedance in parallel with R35.  The value of R35 is increased to keep the detection resistance the PSE sees at 25k ohms.  If you are using a diode bridge or full FET bridge (discrete or integrated) then R35 can be changed back to 24.9k ohms.

    Thanks,

    David