Depends on how you're trying to use PFM. In many cases it's just one possible way to modulate duty cycle, and doesn't really have any impact on the state space averaged models.
Depends on how you're trying to use PFM. In many cases it's just one possible way to modulate duty cycle, and doesn't really have any impact on the state space averaged models.
I'm not really sure how else to say it. All duty cycle modulation schemes (fixed frequency pwm, constant off time, constant on time, pfm) boil down to the control of ton and toff, and therefore duty cycle, for the purpose of state space averaging anyways. After that is accounted for, analysis is the same as it would be for any other modulation scheme. For info on state space averaging you should read this classic paper: https://www.ee.bgu.ac.il/~kushnero/temp/guamicuk.pdf
No system has been actually presented. How can we know if the imagined design is open or closed loop? It's a matter of topology rather than modulation method.
No system has been actually presented. How can we know if the imagined design is open or closed loop? It's a matter of topology rather than modulation method.
I didn't get your point. "System is not present" means what ?
PFM loop consist of: Res div feedback, Max current detect block, Zero current detect block, Comparators along with PowerFets, L & C etc.
Please Consider PFM loop as closed loop. Correct me if I am wrong.
It means you should only expect an answer as specific as your question, and your question is extremely vague.
PFM loop consist of: Res div feedback, Max current detect block, Zero current detect block, Comparators along with PowerFets, L & C etc.
Please Consider PFM loop as closed loop. Correct me if I am wrong.