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TPS2660: Redundant power supply configuration with TPS26600

Stani Bell Ngoufack Tchoufack89
Intellectual 2020 points
Part Number: TPS2660

Hello,

i would like to implement a redundant power supply configuration in my system like the one in figure 64. of TPS2660 datasheet (Chap. 10.3.1) but there are some points i would like to clarify first.

I would like IC2 (see attached image) to be dominant over IC1 and always be ON as long as IN2 > 30V; also when IN2 > IN1 then IC2 should be ON. IC1 should supply VOUT only when IN1 < 30V.

To make this possible, i was thinking of connecting the OVP Pin (of IC1) to the voltage divider of IC2 (see image). Would the internal reference ground RTN of both IC1 and IC2 still be the same? is it even allowed to do this connection?

Or do you have a better idea you can share on how to implement the configuration i mentioned above?

thank you.      

Regards,

Stani

  • 0
    TI__Genius 16305 points
    Hello Stani,

    This is a typical priority power mux applicaiton.
    For priority power mux, please refer to the application note.
    www.ti.com/.../slva811a.pdf

    It is okay to not connect two RTN together.

    Let me know if you have further questions.

    Regards,
    Kari.
  • 0 in reply to Karikalan Selvaraj
    Prodigy 10 points

    Hello Kari, Stani,

    thanks a lot for your quick reply.

    Yes, chapter 5 is the configuration I'm looking for.

    I've been trying to simulate that behavior in Orcad PSpice, so far without success. When the voltage on OVP Pin gets 0 (because the source follower driven by dvdt turns off) the secondary device is not turning on?

    A remark to the application note:

    Page 14 notes that "...the secondary eFUSE OVP feature is not sacrificed due to the source follower configuration...". But that is only true if VIN1 is present. In case VIN1 is off the VIN2 is not monitored for OVP because the source follower is off.