> > Having designed LDO chips, people expect them to perform miracles > well beyond reality. If you have a PNP pass and you are sitting near > dropout, you get control loops that are an ugly combination of a path > to keep the PNP from getting saturated plus one to control the > voltage. > > I never really warmed up to > PNP pass devices, but they are best for high voltage applications. > >
>I was under the impression that the industry as a whole got away from >PNP pass back in the 80s. Off the top, I can't think of any PNP pass >regulation designs worth using. >You've got my curiosity when you mentioned high voltage. Seems to me >that PNP is even worse at high voltage, owing to the majority holes as >carriers rather than majority electrons as in NPN. >Why are PNP better for high voltage than NPN? (I've been using PNP for >nearly everything for about 20 years) .. every now and then i get lazy >and grab a PNP, but that's beyond the context ;) No matter how many times i read something, I miss a major typo and don't see it until right after I hit send! Should read: (I've been using NPN for nearly everything for about 20 years) Steve _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.