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LM5122: schematic review

Jeff YANG
Genius 5455 points
Part Number: LM5122
Other Parts Discussed in Thread: LM5123-Q1

Hi,

Would you please help review below schematic? thanks!

Thanks!

Jeff

  • 0
    TI__Intellectual 2810 points

    Hi Jeff,

    Thanks for reaching out. The connections are placed correctly.
    I hope you have used the proposed calculation from the datasheet to assure plenty of phase margin for the compensation loop.

    But in the datasheet the output voltage level is set by the following equation: Rfb2/Rfb1 = Vout/1.2V - 1.
    Thus, the ratio between the resistor should be 9 if I'm not mistaken, but I get the value of 18.9 when I calculate it using your chosen resistors.

    Please look into this. If the resistor values have to be changed, this would also change your crossover frequency, feedback DC gain and more, thus requiring a second look at the compensation circuit.

    Thank you and best regards,
    Bryan

  • 0 in reply to Bryan Radix
    Genius 5455 points

    Hi Bryan,

    May I know LM5122 have EOL plan?

    I heard from TI team seems will EOL and suggest LM5123-Q1, is it ture?

    Thanks!

    Jeff

  • 0 in reply to Jeff YANG
    TI__Intellectual 2810 points

    Hi Jeff,

    There aren't any plans to EOL LM5122.

    Thank you and best regards,
    Bryan