DC/DC Switching Converters: Is it possible to run a current-mode converter in voltage-mode only? If so, is there an example using a buck converter?
In particular, I'd like to use UC3843 (LT1243) in LTspice as a buck converter in plain-old voltage-mode regulation (disabling current-mode regulation if possible). I've successfully run LT1243 as a SEPIC converter in the past, but I'd like to have run it as a stand-alone buck (step-down) for it's higher efficiency and single winding inductor. I cannot do a flyback (Texas Inst WeBench) for this application.
I apologize if this is a fundamental question. I'm a mechanical engineer by trade and have come a long way learning LTspice, routing PCBs, and programming MCUs. I've tried grounding the Current Sense (SENSE) pin, or changing the compensation, or changing the load type from a resistor to a fixed current load and it always settles at a particular Vout with respect to Vin, as if Vfeedback has no affect.
The UC384X and LT124X chips are current-mode PWM controller legacy chips.
Since I have used this Si7370DP N-channel Mosfet in the SEPIC LT1243 circuit using this UC3843/LT1243 controller, the controller has an internal totem-pole driver. I don't necessarily agree with the responses to this post: UC3843 buck converter
Thanks in advance!