I am designing a SEPIC power supply using the LT3758. I have simulated the circuit in LTSpice and all the waveforms are as expected except the L1 current. Here I see massive overshoots when the MOSFET switches on (eg normal current is about 3A pk-pk and overshoot goes up to over 20A). The spike is extremely narrow (< 1nS).
I am new to LTSpice, so might be missing something obvious.
Is this spike real or a simulator aboration? What could be causing it and what can I do about it?
Input +28V, Output +40V 1A.
[Edit] I have posted a follow on question here LTSpice SEPIC design low freq ringing