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LM5050 output oscillates

Michael Huang3
Intellectual 2460 points

Hi team,

My customer uses LM5050 in switcher. The input voltage is 54V. But it has 200mV ripples. The schematics is below.

But the output is not stable right now. The gate voltage can't get 12V. The Gate is switching. The test waveform is like below. We can see the red output has switching noise and the yellow gate voltage is rising and falling along with time.

The input and output voltage comparison is like below.

I don't know what cause the oscillation. It seems to relate with ripples. Could you kindly help look into this issue?

Best Regards

Michael

  • 0
    TI__Genius 12621 points

    Hi Michael,

    Check out this application note regarding the subject:

    Also, they can consider adding an RC filter to the SENSE pins which may help such as this:

    They can adjust the values (such as 0.1uF and 10ohm to create a 1us filter).

    Thanks,

    Alex