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In Reply to: RE: Being one who posted by AbeCollins on February 17, 2017 at 18:45:20
Thanks for the schematic, now we can know "For Sure" what other regulators are being used. See below data sheets from the manufacture.
Spoiler Alert: Looks like they are Linear Regulated.~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
The NCP1117 series are low dropout (LDO) positive linear voltage regulators that are capable of providing an output current that is in excess of 1.0 A with a maximum dropout voltage of 1.2 V at 800 mA over temperature. This series contains eight fixed output voltages of 1.5 V, 1.8 V, 2.0 V, 2.5 V, 2.85 V, 3.3 V, 5.0 V, and 12 V that have no minimum load requirement to maintain regulation. Also included is an adjustable output version that can be programmed from 1.25 V to 18.8 V with two external resistors. On chip trimming adjusts the reference/output voltage to within +/- 1.0% accuracy. Internal protection features consist of output current limiting, safe operating area compensation, and thermal shutdown. The NCP1117 series can operate with up to 20 V input. Devices are available in SOT223 and DPAK packages.
Line Regulation for 3.3 V = 0.8mV or 0.0008V
http://www.onsemi.com/PowerSolutions/product.do?id=NCP1117
http://www.onsemi.com/pub_link/Collateral/NCP1117-D.PDF
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
LP29808.1 Application Information
The LP2980-N is a linear voltage regulator operating from 2.1 V to 16 V on the input and regulates voltages
between 2.5 V to 5 V with 0.5% accuracy and 50-mA maximum output current. Efficiency is defined by the ratio
of output voltage to input voltage because the LP2980-N is a linear voltage regulator.Line Regulation for ≤ 16 V = 0.7mV or 0.0007V
http://www.ti.com/lit/ds/symlink/lp2980-n.pdf
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Edits: 02/18/17 02/18/17Follow Ups:
No spoiler, I realized they were all three terminal linear regulators per the schematic. But I thought your goal was to bypass all the onboard regulators with something better.
Edits: 02/18/17
how relevant some specs are.Usually if some is good then more is better...we don't consider how much is enough, just more is better.
Same thing for specs, sure I've seen 0.003mV regulators. Even iFi specs rate the voltage as +/-.5V....which is actually much worse than the RPI internal regulator variance. But still, even if you use a 0.0000001mv regulator how much does the ARM processor pollute the whole system?
Pretty much, you can't obsess over one factor and ignore the whole chain. The RPI's regulators are but one factor in a chain of many many variables.
IMO, better to start with the low hanging fruit. Then work you way systematically and logically into other variables that produce the greatest effect on the whole system.
Edits: 02/18/17
That was my goal.
I bypass the switching with something better.
The ones left are linear with 0.8mV and 0.7mv regulation. I can live with that...that is to say my ears are not complaining.
They do have better regulators but I'm not trying to solder something that small...
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