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LMR23610: How to reduce the EMI which is caused by high du/dt?

user4411225
Prodigy 90 points
Part Number: LMR23610

Hi,

     As illustrated, the input voltage is 24V, output voltage is 3V3.

    When I used the probe closed to pin SW,  I found the EMI is very large.

    Loot at my PCB layout. 

     Pls check my sch and pcb layout. 

     Thanks very much!

zhipan

  • 0
    TI__Guru 57555 points

    The layout is not too bad.  I would reduce the width of the SW node a little and try to get the inductor closer to the device.

    Also, I would rotate the output capacitor to shorten its ground lead. 

    I would strive to get the layout close to that shown in the data sheet.