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LM5116: Forward Crossing Phenomenon in Bolt Plot

Stanley Dai
Expert 5810 points
Part Number: LM5116

Hi Team,

Can you please make comments for below questions?

Below is the screenshot of bode plot from customer side. The system working condition is: Vin= 58V, Vout=48V, Iout<=0.2A. Customer found there is forward crossing, which is abnormal and unfamiliar for them. Do you think this abnormal forward crossing indicates system is instable or not, and why? If yes, are there something customer can do to improve system stability?

B&R 

Stanley

  • 0
    TI__Mastermind 34605 points

    Hi Stanley,

    Do you mean the forward cross at about 80KHz? 

    What's switching freq of LM5116? normally only need to scan freq range below Fsw /2.

    is it working at Fully Sync mode? LM5116 is controller, circuit may works at DCM mode if load <0.2A.  customer need to test loop response at CCM mode.

    B R
    Andy