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TPS23754: Could you kindly help to check the Schematic?

Lian Wu
Genius 5250 points
Part Number: TPS23754
Other Parts Discussed in Thread: TPS23751, PMP11254, PMP6812, , TPS23756

Dears:

Could you kindly help to check the Schematic?

8726.POE.pdf

  • 0
    TI__Mastermind 40100 points
    Hi Lian,

    Before we have our engineer review the schematic I notice you're designing a flyback converter with a forward transformer. Can you confirm what your input voltage range, output voltage, output current, and efficiency specs are? We can probably recommend an optimized PD solution for you.
  • 0 in reply to Darwin Fernandez
    Prodigy 10 points
    It's a flyback,The input voltage range is 42.5v-57v,Input maximum current 600mA,The output voltage is 12v,Output current is 2A,The transformer turn ratio chosen is 1.77: 1So the duty cycle of the chip is between 37 and 50 percent,In terms of this schematic diagram, there should be no problem.The details need TI's help.
  • 0 in reply to user5723322
    TI__Mastermind 40100 points
    Hi User,

    If that is the case please see my comments below:

    D7 is backwards (cathode needs to be on RTN)
    May consider using a faster diode D5 like MMSD4148
    For U2, you may consider the A-version CTR
    C33 looks quite low. 1uF would be recommended to start.
    For bob smith terminations, 10nF is recommended and there needs to be an HV cap to chassis ground.

    If looking for a known working design for you specifications, I recommend looking at the TI designs below:
    PMP11254 which uses the TPS23751
    PMP6812 which uses the TPS23754

    Note the TPS23756 is mainly designed for wide input applications (12V inputs).