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TPS23754: TPS23754 how to set Rcs value? What's the function(meaning) of Class, Mark, Mark reset ? Whitch part is the Vdd>35V (fig. 24)?

TIENHUA SU
Prodigy 20 points
Part Number: TPS23754

1. How to set Rcs value?

2. What's the function(meaning) of Class, Mark, Mark reset ?

3, Which part is the Vdd>35V? It looks like at red line. However, it didn't change at green line. 

Thank you

  • 0
    TI__Genius 9230 points
    Hi Tienhua,

    1. Use Vcs(max) = I^2*R to determine the size of resistor to use so that the a desired peak primary current meets the Vcs(max) threshold. See the calculations in section 2.5 to 2.7 of slva305c for more details.
  • 0 in reply to Thomas Amlee
    TI__Genius 9230 points
    2. What's the function(meaning) of Class, Mark, Mark reset ?
    More details about all three are found in section 7.4.1.4

    3, Which part is the Vdd>35V? It looks like at red line. However, it didn't change at green line.
    VDD-VSS=35V is UVLO. See figure 22.

    Thanks,
    Tom Amlee
    PoE PD Apps Engineer