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.

TPS54821 vout abnormal waveform at transient test

Other Parts Discussed in Thread: TPS54821

When I verify transient test in TPS54821 solution. I found out the strange waveform at transient test.

Who can help to explain these abnorml waveform?  (The ripple noise is very big, about 500mV)

Schematic

7484.TI_p2.pdf

 

abnormal waveform 2, CH1=Vout,CH2=Iout,CH3=SW   transient 1A-5A 1KHz

normal waveform 1 , CH1=Vout,CH3=Iout,CH3=SW transient 3A-5A 1KHz