Hi Team,
We would like to ask your help regarding our customer's inquiry below.
1. Does the UCC28740 controller internally implement "ramp compensation"?
The document employs the acronym "Ipp and Ipp(max)" derived by the "control law". I am guessing that Ipp is proportional to the sensed current where Ipp(max) corresponds to Vcst(max). Figure 15 appears to list the range of Ipp (from Ipp(max)/4 to Ipp(max)).
In an inner current loop outer voltage loop design I am use to the output voltage loop generating a peak current level (Vc*Rf = Ic) i.e. the peak current level (Ic) is variable not fixed.
2. Is the control law output Vcst equivalent to the peak current level Vc as described above?
3. Is the minimum controlled current that this controller will allow Ipp(max)/4 vs zero? I get that a larger minimum peak current is more immune to noise and switching frequency is reduced to reduced output power while maintain in Ipp(max)/4.
Regards,
Danilo
