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Switching Current Spikes?

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dangtepau

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For the dc-dc converter circuit and waveforms attached, I have the following questions for the switching current spikes. The implementation detail is as under.

Switching Frequency: 100 kHz
Duty cycle: 80 %
MOSFETS are driven by MC33152 (https://www.onsemi.com/pub/Collateral/MC34152-D.PDF) with 6.5 V peak voltage.
MOSFET: IRFP260N
Average switch current: 12 A
1st (top) waveform: switch S1 current
2nd waveform: switching signal for switch S1
3rd (bottom) waveform: switching signal for switch S2

1) Why these current spikes appear in the switch current? Are they usual or unusual? Any IEEE reference in past 5 years that have discussed the origin of these spikes.
2) How these current spikes can be reduced, if the actual reason is known?

BTW, the drain-source voltage waveform of switch S1 is clean (no apparent voltage spikes).
 

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