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5V DC to DC Converter TPS54331

Sachin Tiwari
Prodigy 100 points

I am trying to get the buck to work that can generate 5V @ 3A

I am using the above circuit but the output is not constant DC and i see some noise/ringing.

What might be causing this? Note: I am using 15uH instead of 5.6

Below are output waveforms

  • 0
    TI__Guru**** 191445 points
    What you are seeing is probably "switching noise". It is always present. If you are observing too much, it may either be poor measurement technique or possibly poor PCB layout. First check your measurement. Measure directly across the output capacitor, with a very short ground lead (< 1cm). "Tip and ring" is best (no GND lead at all). If you still see too much, post your layout. Also, you need to follow the webench design exactly. Do not substitute inductors (slight change maybe ok). Also you can consider an RC snubber from PH to GND.