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PTH08T250W: Request a Design Review

Louis Han15
Genius 4680 points
Part Number: PTH08T250W

Hello

I Request a Design Review about attached Schematic File

Schematic File.pdf

Best Regards.

  • 0
    TI__Expert 8130 points

    Hi Louis,

    Before reviewing your schematic, can you provide more information on your application? What in particular are you having questions with?

    Regards,
    Alejandro

  • 0 in reply to iAlejandro
    Genius 4680 points

    Hi Alejandro

    This application is POTN (Packet Optical Transport Network).

    We need confirm of schematic before manufacture.

    In particular, please review the current sharing section in detail.

    Best Regards.

  • 0 in reply to Louis Han15
    TI__Expert 8130 points

    Hi Louis,

    Understood; thank you for clarifying. I will be reviewing your schematic and will get back to you as soon as possible.

    Thank you for your patience,
    Alejandro

  • 0 in reply to Louis Han15
    TI__Expert 8130 points

    Hi Louis,

    I reviewed the current sharing section alongside the rest of the modules. One thing I quickly noticed is that you have the same amount of output capacitance and and TurboTrans resistor values across devices. That already was a concern since the calculations on selecting the correct values for PTH08T250 and PTH08T210 are completely different. Please make sure to review both sections, Adjusting the Output Voltage and TurboTrans Selection, for both devices. That will provide a more detailed step-by-step guide on determining the correct values to implement on your design.

    • U5(PTH08T250WAD): concern over RTT value.
      • The RTT value corresponds to the amount of output capacitance required to meet a desired transient voltage deviation. The required resistor value can be calculated using Equation 2 or selected from the TurboTrans tables stated along the equation.
      • R21 = 17.88 kΩ
    • U7 & U11 (PTH08T250WAD Current Shared): concern over RTT value.
      • Follow same guidelines as stated for U5.
      • R28 = 17.88 kΩ
    • U14 (PTH08T210WAD): concern over RSET and RTT value.
      • The required RSET resistor value can be calculated using Equation 2 or selected from Table 6. R39 = 63.4 kΩ.
      • The required RTT resistor value can be calculated using Equation 1 or selected from the TurboTrans Selection tables. R43 = 6.95kΩ.
    • U16 (PTH08T210WAD): concern over RTT value.
      • Follow same guidelines as stated above.
      • R49 = 6.95kΩ
    • U69 & U71 (TPSM82480MOP): looks fine.

    Note: Please make sure to double-check my calculations by using the appropriate equations or tables provided in the datasheet.

    Regards,
    Alejandro