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LMZ22010: LMZ22010 SYNC grounding PWM Fixed stray

user4093320
Prodigy 20 points
Part Number: LMZ22010

i have question about LMZ22010。 I grounded SYNC。It resulted in a fixed spurious 359 kHz of my RF signal  。I don't know how to deal with this mess. Below is the schematic diagram of my design.

Thank you. I look forward to hearing from you soon

  • 0
    TI__Guru 50120 points

    Hi,

    Please attach your schematic diagram again. It did not show up in your message.

    When SYNC pin is tied to ground, synchronization is not used and the module operates in free-running PWM frequency of 359kHz typical. Your result sounds typical for a SYNC to GND operation.

    Regards,

    Jimmy