I'm designing a dimmable led string drive circuit. Reading the datasheet for the ic (OB3372KP), under reference circuit/ application, I run into abbreviations for caps and resistors listed that don't have a value but an "nc" written below. I know this generally means "no connection", but I'm looking for clarification as to why its listed with certain caps or resistors. Is their value not necessary and that specific component only needed if left without a connection/ floating? Do you eliminate the component if there isn't a connection made/ signal input there. Or vice versa. Please advise. I'm including a pic for reference. Thank you in advance for your help.