I am looking at datasheets for ICs like FAN4800 or NCP1337. Some of these are PFC boost converters and others are for other types of SMPS topologies.
My confusion is that I can't tell if these ICs are actually supposed to be regulating the output voltage. There is never any mention of PID or compensation techniques to use with these ICs. I am hoping that its all included internally, but I see no hints of a PID system when I look at the internal block diagrams of these parts. Is this correct to assume or do I need to design an external compensation circuit?