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>> No.1845365 [View]
File: 45 KB, 1134x817, Screenshot from 2020-06-19 17-04-49.png [View same] [iqdb] [saucenao] [google]
1845365

>>1845308
Yes, it's LC tank ringing, but try adding series resistance after inductor, it can prevent voltage from going negative. You should also consider how diode is modelled (ideal/not ideal). For example ltspice analysis confirms LC resonant frequency after abrupt change in duty cycle (pic related, calculated T=628 us) .

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