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TPS2660: Power MUXing

Komal Sharma
Intellectual 395 points
Part Number: TPS2660
Other Parts Discussed in Thread: TPS2121, LM5069, LM74700-Q1

Hi,

What is the difference between a Power Muxing with multiple protection mode (TPS25942,TPS26600) circuit and an integrated ORing and Hot-Swap controller (TPS2474x) in terms of circuitary??

what is the suitable solution to overcome the trade-offs for Power MUXing like output Voltage drops, Inrush current, reverse Current Switchover time?

  • 0
    TI__Guru** 105361 points
    Hi Komal,

    Can you please share your system requirements to explain the difference in reference to those parameters.
    What is the application use case? voltage and current specs? and the end equipment?

    Best Regards
    Rakesh
  • 0 in reply to Rakesh
    Intellectual 395 points
    Sir, I wish to propose the right methodology for implementing Hot-Swappable Redundancy in Power Supplies (DC) irrespective of the requirement specifications.
  • 0 in reply to Komal Sharma
    TI__Guru** 105361 points
    Hi Komal,

    From power muxing perspective, TPS25942,TPS26600 and TPS2474x behaves similar in function. For higher currents, please go for external FET solution TPS2474x .

    Best Regards
    Rakesh
  • 0 in reply to Rakesh
    Intellectual 395 points
    OK sir...thanks!
    Sir, does that mean that this integrated solution of Active OR'ing and Hot Swap controllers are able to provide Power MUXing as well?
  • 0 in reply to Komal Sharma
    TI__Guru** 105361 points
    Yes, correct Komal. For lower currents<4.5A, I recommend new power MUX device TPS2121.

    Best Regards
    Rakesh
  • 0 in reply to Rakesh
    Intellectual 395 points

    Thanks a lot sir!

    Also sir If I am using two backplane voltage for the purpose of dual redundancy and one of them is on standby (one supply is sufficient to feed the load), then i should use Efuse or integrated controllers in order to avoid transients. But if both are live should i use Current sharing controller also?? Please refer to the proposed diagram below. Is it correct?? Please throw some light on it.

  • 0 in reply to Komal Sharma
    TI__Guru** 105361 points
    Hi Komal,

    Can you re-post the proposed diagram. I am not able to see.
    If one supply is sufficient to feed the load, go for priority muxing. If you want two sources to power the load use ORing configuration. what the voltage and load current levels?

    Best Regards,
    Rakesh
  • 0 in reply to Rakesh
    Intellectual 395 points

    Sir,

    Kindly have a look at the figures of the  proposed model (attached below) for the Power Supply Redundancy implementation. Here I assume that each of the two supplies is sufficient to feed the load. So there are two cases:

    1) Both the supplies are active: For this case, since current needs to be shared equally, I use current sharing controller along with Hot-swap and Active-ORing controllers. (Fig. 35)

    2) Any of the two supply is active: In this case since switching will be required so I can use Active ORing controller and Hot-Swap Controller or an Integrated controller or a Power Mux Efuse but no current-sharing controller since there is only one active supply that is yielding the current.. (Fig. 34)

    Please correct me if I am wrong.

    Fig 34.tif

    Fig 35.tif

  • 0 in reply to Komal Sharma
    TI__Guru** 105361 points
    Hi Komal,

    Your understanding and implementation for the two case is correct.

    Best Regards,
    Rakesh
  • 0 in reply to Rakesh
    Intellectual 395 points

    Thanks a lot sir.

    Please guide me on one more requirement.

    A Power Conditioning Module (PCM) receives 24VDC Power Supply from a battery through MIL38999. The input range is 18-36 VDC and nominal output is 24VDC. PCM has to be connected to total six units over a cable length of approx. 6 meters each. The output of PCM should withstand this voltage drop. The Power conditioning module shall be protected for reverse input voltage. The input transients to whom the power conditioning module is specified should be compliant with MIL-STD-1275A/B. The inrush current of the PCM module shall be upto 60 Amp. The under voltage lockout shall be 18VDC.

    What approach should be applied to implement Power supply redundancy to the above case??

  • 0 in reply to Komal Sharma
    TI__Guru** 105361 points
    Hi Komal,

    You can use LM74700-Q1 (for reverse polarity protection) in series with LM5069 (for inrush management) at the input of PCM.
    Please open a separate thread for any questions on LM74700-Q1

    Best Regards,
    Rakesh
  • 0 in reply to Rakesh
    Intellectual 395 points

    Thanks a lot for your help sir. Your advice and suggestions have been of extreme help to me. :)