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LM5010: When using LM5010 to do"input=52V, output=24V", the inductance makes a sound.

Eggsy Pang
Expert 4985 points
Part Number: LM5010

Hi team,

      My customer use LM5010, when input=52V, output=5V, it work well.

But when input=52V, output=24V, the inductance makes a sound, teh inductance is 220uH, shown in below SCH and layput. Do you have any suggestions?

Thanks!

  • 0
    TI__Expert 6860 points

    Eggsy ,

    It looks like the switching is not stable in the application . You can verify the same my probing the switch node .

    There are many Issues with the layout . Critical Input di/dt loop , output loop as well as ripple injection circuit placement and layout needs to be modified .

    Please refer to below layout example from datasheet .

    Further customer can optimize the ripple injection circuit to obtain stable switching . Here is App note : http://www.ti.com/lit/an/snva166a/snva166a.pdf

    ---Ambreesh