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TPS25762-Q1: PD system architecture and ORing selection suggestions?

Delun Kao
Intellectual 295 points
Part Number: TPS25762-Q1
Other Parts Discussed in Thread: TPS2412, TPS2413, , LM74700-Q1, TPS25948

Hi TI,

Due to the client's requirements, I have designed a power structure. Could you please help me confirm if my selection parts is feasible? Or do you have any better suggestions? If there are any deficiencies in my design, please let me know as well.

Due to my client's requirement for three power inputs (including 2*12V + 1*PD) to serve as redundancy, I have implemented a set of ORing circuits for isolation. Additionally, I have incorporated a Buck-boost converter due to the wide voltage range of the "3. USB-C" input. Is this approach correct, or do you have any other suggestions? Y
Please advise. Thank you.

BR, Delun

  • 0
    TI__Mastermind 39200 points

    Hello Delun,

    Is the "12V/8A" spec in the SYSTEM block, correct? 

    Which RSET is planned to be used with the TPS2412PW? Are there any concerns with the turnoff V(ac) threshold?

    BR,

    Seong

  • 0
    Intellectual 295 points

    Hi Seong,

    Correct, we anticipate that the total system power can be kept within 100W (including the required 36W to support the output of USB-C), and it should operate normally when standard USB-C is used as the sole power source.

    I'm not entirely sure what you mean by "RSET." From my understanding, the TPS2412 should be capable of achieving ORing functionality to protect against reverse flow conditions when simultaneously connecting three input sources. The idea may have originated from the customer's initial request for redundancy VAC power sources, and later the customer also requested a PD as an input. Would there be any risks associated with this configuration? Please advise. Thank you.

    BR, Delun

  • 0 in reply to Delun Kao
    TI__Mastermind 39200 points

    Delun,

    Please disregard my question about RSET. I confused the part with the TPS2413 variant and asked to confirm if there would be any concerns with the different MOSFET control method.

    Everything looks good but I am not 100% certain if the OR is the right device for this solution. Let me look into this a bit more and get back to you. 

    BR,

    Seong

  • 0 in reply to Seong Kim
    Intellectual 295 points

    HI Seong

    OK, please help clarify.

    I would like to ask another question, can the USB-C connector connected to TPS25762-Q1 be used for general transmission, like a general USB Device (data)?

    BR, Delun

  • 0 in reply to Delun Kao
    TI__Genius 13610 points

    Hi Delun,

    TPS2412 can be used for ORing here. Only thing here is, TPS2412 cannot withstand any negative voltage at the input, if you expect negative voltage, please consider LM74700-Q1 once.

    LM74700-Q1 data sheet, product information and support | TI.com

    Regards,

    Shiven Dhir

  • 0
    Intellectual 295 points

    HI Shiven Dhir,

    Thank you for the reminder. In my application, there won't be any negative voltage. I'd like to ask the expert if using TPS25948 would be more suitable than TPS2412. I see that TPS25948 has a feature for setting priorities, but I'm not sure how to implement this when 3Rail are in parallel? Please advise.

    BR,Delun

  • 0 in reply to Delun Kao
    TI__Mastermind 39200 points

    Delun,

    As long as the D+/D- signals are not routed to the TPS25762-Q1, there won't be any issues with general USB 2.0 data transmission.

    BR,

    Seong

  • 0 in reply to Delun Kao
    TI__Genius 13610 points

    Hi Delun,

    TPS25948 can be used as well even if there are 3Rails.

    Looping expert of TPS25948 for help.

    Regards,

    Shiven Dhir

  • 0 in reply to Shiven Dhir
    TI__Guru 55920 points

    Hi Shiven,

    This is how TPS25948 can be used for more than 2 rails. Basically we OR the SPLYG from 2 channels and feed it into OVLO of 3rd channel.

    Please refer more details in datasheet section 9.5 Priority Power MUXing

    Regards

    Kunal Goel