• State
  • Locked Locked
  • Replies 1 reply
  • Subscribers 63 subscribers
  • Views 492 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

What causes the low frequency noise in the TPS54620 reference design?

mike leggett
Prodigy 50 points
Other Parts Discussed in Thread: TPS54620

I noticed semi random spikes in the output of the TPS54620 output in the bench mark simulation and would like to understand where it come from.  I have attached the generated wave forms with the second one zoomed in to a single event.  The only changes I have made to the schematic are to set Vout to 8.15 volts and the load current resistor for 5 amps.

 

Mike

 

  • 0
    Genius 3295 points

    Hello Mike,

    Is the Phase signal TP5 on the schematic? If it is, it may be that you have your input voltage too low and every few ms the controller shuts off. This is just an off the cuff guess. The output voltage waveform looks a lot like what happens when the converter is going through a high-load to no-load transient. Have you checked you connections to the 5 A load resistor? Maybe you have a loose connection. Hope this helps,

    -Chuck