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DCM Boost Converter Simulation Problem !!!

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Willt

Willt

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Hi friends,

I'm simulating a boost converter in DCM.
The inductor current is supposed to decrease until zero
during the switch is OFF.
However, from my simulation results, the inductor current
drops to -ve values. Why come?? How to solve such problem??

L = 400uH
C = 100nF
R = 3.3k
SW is large enough.

Any comment is highly appreciated.

In the waveform:
green - vdd (always 1.5V)
blue - Vx
pink - inductor current
purple - switch gate voltage

Thanks.

Will
 

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