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TPS546C20A: SIMPLIS Simulation issue

Part Number: TPS546C20A

Tool/software:

The frequency setting with RT is 66.5kohm, which suppose to get a frequency of somewhere around 300kHz

The result getting inconsistent switching waveform, 150kHz / 300kHz. 

The file is run nicely for step down to 3.3V for same frequency but change it to a 1V output. I faced this issue.