I have been working on the step-down converter RT-2875B and the PSpice model is generated by Richtek.
At the Vsw pin, for input voltages 8 to 17 the simulation environment is recording a sine waveform. While for higher voltages, 18 to 30, I am observing a proper square waveform with ringing.
Why am I seeing such an error when the only parameter being varied is the input voltage?
Copyright © 2020 Cadence Design Systems, Inc. All rights reserved.
It is best to ask model/app circuit developer. May be one of the switching conditions are not met and PWM operation is not starting at lower voltages. Although UVLO upper limit is 4.1V