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LT3999 Simulation


I am running a LTSpice simulation using in-built LT3999 macro model test fixture available. The test fixture is designed for a 12V input, 12V output, 0.4A load which seems to be working well.

However, when the load is changed to 1kohm and Rdc set to 10kohm, the SWA and SWB waveforms show huge overshoots and undershoots. This is also causing the output voltage to go beyond the expected value. Any help in understanding what is causing this issue and how it can be overcome is appreciated