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
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