Hi
> On Dec 11, 2014, at 7:37 PM, xaos <x...@darksmile.net> wrote: > > I don't know if this is the right time to ask this but here goes. > I have started a design for a linear power supply for the Beagleboard > > 5V 5-10A. Over-Voltage, short circuit and temp protection. > Very low ripple and HF noise. > > I have been watching this thread and I am still not sure > what device would give me what I want. I am not as good as > some circuit designers here, to design a PS > via discreet transistors. Dr. Bruce Griffiths comes to mind. > He would probably do this with his eyes closed. > > So, I need to use a regulator chip. The simple answer is that a 78L05 style regulator will do just fine. Bob > > The TI TPS7A4700 looks great but it can only supply 1A. > > Any other candidates ? > > I am sorry if I am somehow asking an obvious question. > > -George > > On 12/11/2014 06:26 PM, Neil Schroeder wrote: >> So I've done a lot of work in power lately and I can summarize some of this >> quickly: >> >> The lowest noise LDOs today are the TI TPSa4700/01 up to 36v/1a and about 4 >> uVRms noise, and the ADP7154/55 up to 5.5v and 600ma with only *0.9* uVRms >> above 100hz. >> >> Both feature great PSRR -and in the case of the ADI part don't even >> recommend filter caps at all. >> >> The TI however does still recommend some capacitance. >> >> Now most people's next question is how to get their ruby or their >> septuple-oven homebrew design powered by one. The quick answer is an error >> amplifier based ldo balancer for the most accurate distribution of current. >> Also helps with heat. >> >> Will share a sketch when at my desk next. >> >> >> On Thursday, December 11, 2014, Hal Murray <hmur...@megapathdsl.net> wrote: >> >>> e...@telight.com <javascript:;> said: >>>> If the plan is to use a three-terminal regulator after all, I'd suggest >>> not >>>> using a low-dropout (LDO) type if the raw input supply is noisy - the >>> LDOs >>>> usually have PNP output transistors (for positive regulators), so may >>> tend >>>> to have poorer HF input ripple rejection than equivalent ones with NPN >>>> passers. >>> In this context, what is "high"? >>> >>> Why don't filter caps solve that end of the spectrum? >>> >>> >>> -- >>> These are my opinions. I hate spam. >>> >>> >>> >>> _______________________________________________ >>> time-nuts mailing list -- time-nuts@febo.com <javascript:;> >>> To unsubscribe, go to >>> https://www.febo.com/cgi-bin/mailman/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. > > _______________________________________________ > 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. _______________________________________________ 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.