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LM5161-Q1: EMI Issue

Jason Fan
Intellectual 1705 points
Part Number: LM5161-Q1
Other Parts Discussed in Thread: LM5161

Hi  Experts: 

            My customer is testing their board with the EMI specification , in the RE test, they found the harmonic frequency 55Mhz, 66Mhz, 77Mhz,88Mhz, which is derived from the 11Mhz fundamental wave. Please see the result below: 

            i just want to make sure whether there is 11Mhz clock inside of the LM5161 ? 

  • 0
    TI__Mastermind 40040 points
    Hello Jason,

    No clock at this frequency inside the device. Check Switch node for ringing, measure the Time between the peaks and use 1/Time for the frequency. If the ringing does not match, then its likely the harmonics of the fundamental switching frequency?

    Hope this helps?

    David.