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 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.