[time-nuts] Totally unrelated, but..
scott.j.stobbe at gmail.com
Thu Dec 8 13:02:08 EST 2016
That's a really nice part, like the old LM723 was bring your own pass
element, the 3042 is essentially bring your own reference, I hope that is a
trend that continues. And a 10uF capacitor is pretty quiet at 1KHz plus.
The other neat thing about the 3042 is the error amplifier is run unity
gain with a compensation network. For a typical 12V ldo you loose 20 dB
loopgain and 1 decade of loop bandwidth gaining up 1.2 VRef to 12 V on the
feedback divider. At 12 V I'm sure the 3042 would blow a typical LDO out of
the water in line/load regulation.
On Wed, Dec 7, 2016 at 11:36 PM, jimlux <jimlux at earthlink.net> wrote:
> On 12/7/16 4:20 PM, Scott Stobbe wrote:
>> Yes, the short hand I like to use is 4 nV*sqrt(R/1000).
>> 2 nV/rthz off a bandgap is pretty darn impressive, that includes a delta
>> vbe gained up ~10x.
>> On Wed, Dec 7, 2016 at 7:03 PM Bob Camp <kb8tq at n1k.org> wrote:
> the cool thing about those parts is that their PSRR extends up to several
> MHz. A lot of LDOs have good PSRR to kHz.
> Someone at LT did a good job on that design.
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