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LM25184-Q1: schematic review

Ivy Jin
Expert 4625 points
Part Number: LM25184-Q1

Tool/software:

Hi team，

Could you please help review below schematic and give some suggestions? Thanks!

7115.LM(2)518x PSR flyback converter quickstart tool revB.xlsx

Regards,

Ivy

  • 0
    TI__Mastermind 22300 points

    Hi Ivy,

    I have assigned this thread to the appropriate engineers.

    Best regards,

    Ridge

  • 0 in reply to Ridge Lahti
    TI__Expert 4625 points

    Hi Ridge,

    Thanks, if you have any comments, please feel free to let me know.

    Regards,

    ivy

  • 0
    TI__Genius 15566 points

    Hi Ivy,

    See below my schematic review:

    1. Rfb: I recommend decreasing this value to ~123kohm as recommended by the calculator. Rfb sets the output voltage from a voltage divider from internal VREF from the switching node, so it is very important to set correct Rfb value for good regulation at Vout.

    2. Cout1: I recommend adding a 2.2uF 50V cap at output1 to meet low voltage ripple.

    3. Cout2: I recommend adding a 4.7uF 15V cap at output2 to meet low voltage ripple.

    4. The rest of components look good. Just keep in mind that at VIN_min 10V, the Poutmax is ~10W, so the output power might be limited at that value. For VIN nomial 12V, max power is ~12.2W, which should be good enough for your load conditions (11.25W).

    Thank you