Hi team,
I'm looking over the figure 14 schematic and trying to get an idea of how the current sharing between the actual regulator and the NPN would work. My initial thought is that the NPN would be doing all of the "heavy lifting" and supplying the current to the load and the voltage regulation would come from the LDO itself. That being said, the LDO would only be loaded enough to cause the PNP/NPN chain to bias to supply the required current and then the system would settle under the load (28V,4A)
What I'm trying to determine is the base current at the PNP but it is understanding the actual load on the LDO at this point of steady-state operation that I'm not quite grasping. Once I have that, I think I can figure the rest.
