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Original question:

TPS40210: PMP4650 circuit

TPS40210: TPS40210-Reference data

brian chen
Prodigy 20 points
Part Number: TPS40210
Other Parts Discussed in Thread: LM5155, PMP40555

Dear Sir 

             We plan to desing TPS40210 (Vin =12 to 57V ,Vout =12v )

            but we can not find the referecnce desing -PMP4650 on TI web 

            Could you please provide the correcnt path for down PMP4650

             Thanks 

            

  • 0
    TI__Genius 15540 points

    Hi Brian,

    Thanks for using the e2e forum.

    I was not able to find PMP4650 within our library either.
    If this was a reference design of TPS40210, it might have been removed or edited.

    If you are not able to find a similar reference design that fits the given specification, I would recommend to build the design manually using the datasheet and the quickstart calculator, which can be downloaded from the product page.

    Please let me know if you have any additional questions.

    Best regards,
    Niklas

  • 0 in reply to Niklas Schwarz
    Prodigy 20 points

    Dear Niklas

                    Thanks for your reply.     

    I can follow as below link to draw the schematic
    TPS40210: PMP4650 circuit - Power management forum - Power management - TI E2E support forums

    Please refer to this Q&A link .We want to know .
    1. How to select the Q2?
    2. How to calculate the value of R67 and R77 ? (Q4 Will be uninstall) .Can we change R77 to 0 ohm
    3. Does any data explain this circuit in more explicit ?

    Thanks 

  • 0 in reply to brian chen
    TI__Genius 15540 points

    Hi Brian,

    Thanks for the feedback.
    Its is hard to work with just the schematic of the PMP4650, as I cannot find any other data on the reference design and also no values for the input voltage range or the output power.

    As the design uses an alternative enable structure, I would need some time to look into this design myself.
    I will try to find out more about this reference design and give you an update within the next two days.

    Best regards,
    Niklas

  • +1 in reply to Niklas Schwarz
    TI__Genius 15540 points

    Hi Brian,

    Sorry to keep you waiting.

    I did some further research and found a reference design for this topology using a similar part (LM5155).
    https://www.ti.com/tool/PMP40555
    (Vin 9V-60V, LM5155 max Vin 45V, Vout 12V)
    This reference design comes with schematic, test report and BOM cost, so it might be a good fit for a reference.

    I hope this reference design is useful to you.
    Best regards,
    Niklas

  • 0 in reply to Niklas Schwarz
    Prodigy 20 points

    Dear Niklas

       Thanks for your greate support.

        We can find ths PMP40555 .But can not find any otther relate to desing concept  such as prvious question

      ""   Please refer to this Q&A link .We want to know .
    1. How to select the Q2?
    2. How to calculate the value of R67 and R77 ? (Q4 Will be uninstall) .Can we change R77 to 0 ohm ? ""

        Thanks   

  • 0 in reply to brian chen
    TI__Genius 15540 points

    Hi Brian,

    Thanks for the feedback.
    I will check if I can find any specification recommendation for Q2 and get back to you with a response on this and the other questions by the beginning of next week.

    Thank you and best regards,
    Niklas

  • 0 in reply to Niklas Schwarz
    TI__Genius 15540 points

    Hi Brian,

    sorry for keeping you waiting.
    For selection of Q2, when selecting an N-channel FET or BJT, please make the following considerations:
    - check the voltage ratings to withstand the max input voltage
    - check the resistance values when operating in the resistive area, as there can be thermal issues if the switch heats up
    - Both FET and BJT can be used for this application
    For selection of the diode:
    - check the leakage current
    - check the thermal performance
    For selection of the R69:
    - use a resistor that is small enough that there is enough current to supply the gate (if all the current leaks through the diode, there is not enough current to supply the gate)

    Like in the design of PMP40555, the R77 resistor is not required and can be set to 0 Ohm.

    Best regards,
    Niklas