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Original question:

TPS54531: Derivation of UVLO resistor equations

TPS54531: Ren1 and Ren2 calculation details

Ryo Akashi
Genius 9470 points
Part Number: TPS54531

Hello experts,

In this thread, there is description of V1+V2=Ven and V3+V4=Ven.
I'm not clear about this point.
Could you tell me more details?

Thanks and best regards,
Ryo Akashi
  • 0
    TI__Expert 4795 points

    Hi Ryo,

    For the details behind (1) and (2) needs to check with previous author Andy.

    Key points here are before device Enable, pull up current is 1uA; after device Enable, pull up current is 4uA. So we can have the equations:

    (Vstart - Ven)/Ren1 + 1uA = Ven/Ren2 -----------(a)

    (Vstop-Ven)/Ren1 + 4uA=Ven/Ren2 ---------(b)

    We can get Ren1 and Ren2 by solving above two equations.