Please forgive this naive question, but I am concerned about the idea of simply running two regulators in parallel. Just like you don't put two batteries in parallel, how do you ensure accurate load balancing between the two? I would worry that one of them, with a fractionally higher voltage, would be driven into saturation, thus ruining any noise isolation. I must be missing something here?
Peter On 18 March 2018 at 22:43, Charles Steinmetz <csteinm...@yandex.com> wrote: > Tom wrote: > > Run two in parallel for twice the current and less noise? >> > > This is actually a better solution than using an LT3045, for two reasons. > First, as Tom noted, by paralleling two devices, the noise is reduced by > sqrt 2 = ~1.4: > > "Designed as a precision current reference followed by a high performance > voltage buffer, the LT3042 is easily paralleled to increase output current, > spread heat on the PCB and further reduce noise -- output noise decreases > by the square-root of the number of devices in parallel." [LT Journal of > Analog Innovation, v25 n1 Apr 2015]. <http://www.linear.com/docs/46398> > > Second, it reduces the dissipation of each regulator, so they run cooler. > And as LT says, it allows spreading the heat on the board (but it is not > advisable to put them too far apart). > > The primary disadvantage is that two 3042s cost about half again more than > one 3045. Also, board space may be a factor in some applications. > > So, unless you are extremely tight on board space or the ~1.5x cost > increase is prohibitive, two 3042s in parallel are a better solution than > one 3045 if you are seeking the lowest noise possible. > > Best regards, > > Charles > > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/m > ailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ 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.