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TPS5401 high Freq ripple

Genius 3475 points
Other Parts Discussed in Thread: TPS5401

Hi

Like to seek help on a high freq ripple question that is detected on the 2nd and fifth harmonics of the switching freq as below.

We are using the tip and barrel method to probe the Vout of the TPS5401.

Vin =11v8

Vout = 3v3

Iout = 80mA

 

In spectrum

In waveform

Is there any way to reduce the over shoot?

Ivan

  • Usually the two main approaches are to pay careful attention to component placement and layout and then you can consider an RC snubber from the PH node to ground.  If you need help with that i can forward a document describing RC snubber design.