[time-nuts] Linear voltage regulator hints...
shalimr9 at gmail.com
Tue Dec 9 16:46:44 EST 2014
Voltage References are usually not able to deliver much more than a few 10mA.
Having a stable reference means no big temperature gradient on the die, so that precludes a big pass transistor.
Most likely, you will have to roll your own.
Using TL431 types of shunt regulator with a single bipolar transistor yields a simple and high performing regulator (at least much higher than most 3 terminal series regulators) particularly if you use the Linear Tech equivalent part (forgot the part number at the moment, but look for shunt regulators)
On December 8, 2014 4:59:24 PM CST, Bob Camp <kb8tq at n1k.org> wrote:
>As with anything else it’s a matter of “what’s in your wallet”.
>The parts you are after are called voltage references rather than
>voltage regulators. You can get them well down into the low ppm’s / C
>or lower. The cutoff is more a function of “do you want to spend $100
>or not” rather than a specific level you simply can’t get to.
>> On Dec 8, 2014, at 1:18 PM, Dan Kemppainen <dan at irtelemetrics.com>
>> In playing with some oscillators and a GPSDO here, I think I'm seeing
>a voltage sensitivity issue.
>> So, I started looking at the output voltage of various regulators vs.
>temp. Using standard LM/UA type linear regulators and some LDO's, they
>all appear to be pretty sensitive to temperature. (millivolt / few
>degrees Fahrenheit sort of sensitivity). Most of the datasheets seem to
>ignore temp sensitivity. Almost like they are so bad they don't want to
>> Does anyone have hints on TO-220 or D-Pak type regulators that have
>really good temp coefficients and good line regulation? A few PPM/Deg C
>might be nice, if possible. Or am I into a 'roll you own' type
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