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LM76002-Q1: EMC Issue of LM76002-Q1

Part Number: LM76002-Q1

Hello TI Colleagues,

      Now we have a demo used LM76002-Q1, but we have a lot failure points during the CE test. According to the results, all the failure points are from the frequency doubling of DCDC switch frequency.

     The details , you can see the test graphic , waveform and simplified schematic: 

      Simplified schematic: 

               Output :  5V  600mA  



     Waveform of SW PIN:


      CE test result:



       During the debug process, we did a lot changes for DCDC, for example , we adjusted input π filter, DCDC working mode, DCDC switch frequency, BOOT Circuit , output coil and input/output capacitor , but the results have no improvement.

     Do you have any suggestion for this issue, what should we try?

     Thank you very much!