TLV62569: I am able to see switching noise in oscillscope

I have also tried by connectiong 1nf and 10nf cap at output of 3.3V.but switching noise was still there.

Hi Vishal,

Did you solder a terminal block in the output capacitor to ensure that the oscilloscope probe have a good contact when measuring the ripple? See figure below for reference.

How about changing the bandwidth setting to 20MHz in the oscilloscope? Did it eliminate the switching noise?

By the way, can you try to use 220pF filter capacitor instead?

Best regards,

Excel

I have tried with limiting oscillscope bandwidth to 20 Mhz at that time i can not see switching noise.

I have also tried with 100pf and 270pf at output.Now i am getting swiching noise with repeats after 100hz frequency. I have attached the waveform.

The 100Hz noise should not be coming from the buck converter (TLV62569A) but possibly from AC Power Line from the oscilloscope or the power supply use to power the TLV62569A. 

Can you not just limit the oscilloscope bandwidth to 20MHz to filter the unnecessary noise? It should be enough to measure the ripple voltage appropriately.

Hi Vishal,

Are you still experiencing any issue with the ripple voltage measurement? If not, then I will close this thread.

Best regards,

Excel