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LMR33630: SW spikes

Sveinn Jia
Intellectual 2850 points
Part Number: LMR33630

Hi team,

About Lmr33630 ADDAEVM  ,  I have two questions 

  1. As shown in the following two figures, why the Spikes of the SW is larger at low Vol(The same is a 3A load). In my understanding, Spike Vol is associated with parasitic inductance of the mos itself and current , lower input  Increase the minimum value of the inductor current , but the maximum inductor current is reduced. So the reason for the downward spike, I don't quite understand. The upward spikes grew, and I don't know if I understood is right.  So please help answer the question. Thank you very much .

 

 2.Is it normal for the ripple value to be somewhat jittery? (It always feels like the loop isn't very good, is that right?) (It is already the test method of the smallest ring)

 

BR

Sveinn