[time-nuts] Linear voltage regulator hints...
xaos at darksmile.net
Thu Dec 11 19:37:22 EST 2014
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.
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
> 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 <hmurray at megapathdsl.net> wrote:
>>> If the plan is to use a three-terminal regulator after all, I'd suggest
>>> using a low-dropout (LDO) type if the raw input supply is noisy - the
>>> usually have PNP output transistors (for positive regulators), so may
>>> to have poorer HF input ripple rejection than equivalent ones with NPN
>> In this context, what is "high"?
>> Why don't filter caps solve that end of the spectrum?
>> These are my opinions. I hate spam.
>> To unsubscribe, go to
>> and follow the instructions there.
> time-nuts mailing list -- time-nuts at febo.com
> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the instructions there.
More information about the time-nuts