Hii, I'm new to embedded systems. I have the B-G474E-DPOW Discovery kit with STM32G474RE MCU and I implemented the peak current mode Buck converter(HW) as described in the application note of stm. The only thing that I cannot understand is how exactly the sawtooth generator is implemented.
The DAC input is the demand current extracted from 2p2z controller(FMAC out). As it described in the application this is the initial value of the sawtooth waveform, but we should also set Vramp (e.g. 0.5V).
What exactly is the purpose of Vramp and why in the oscilloscope the sawtooth wave starts from Vramp value instead from converted Demand current(DAC out)?
