TL431 Spice model variants´ TEST

presented as we go
► 1-st

► 2-nd

► 2-nd - in detail

wider range

component level models (sub circuits compared)

the best - upper two are the attempts to achieve better precision×frequency-rejection //// the reverse Vref´s emitter (EB) diode in Rank#(7) is a contemporary relic from an attempt to force the "Hot Start" for U4,U5 . . .

pulse e.g. stepped load response

overall ranking so far ...

? best CLM-s !!! for static operation . . .
. . . for undefined input the U5 e.g. X4 is likely better choice /// might be quite expensive regulator as the RF transistors cost $ 0.2÷1.0 per pcs.  /// (i can't comment nor recommend nor reject the macro models - but usually they are too optimistic !!!)

hi, hi - UPS! seems i used Amps insted of milli-Amps

that re-ranks the rank back to "Static" -- the red box is "for super cool experiments only!!" . . .
. . . so U2 // X1 the best CLM !!!

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Absolute Voltage 2

the followup of the prev. post -- tested the experimental reference + came up with a new 1

the near zero error gives us the "absolute" voltage ref. -- tough -- there's no information about it's response to varying temperature !!!

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"Flasher" revisited , DB3 spice programmatic model Test

The inverter v. of LED-Flasher . . . at various dev. stg.-s

The boost converter v. with new voltage reference

the new voltage reference

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the next thing i actually built (*with protective fuse - not in simulation) - WYCIWYG . . . almost

. . . at both modes you mostly perceive the thing "blinking" - only the after-flash at second mode makes it some different from simple blinking . . . donno

! Note : * it is . . . wise to fuse the mains equipment  also as dumb as that coz - such being experimental you never be too careful to predict weld failure either caused by heating components or bad quality weld/materials . . . . . . . . . also when whatever fails and op.-l parameters exceed the intended design values they won't all burn off - extra to that i got the elongation wire with switch - so i can cut it manually every time there's even a slight suspicion something is about to go wrong

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Random Op Amp Voltage References

as it shows -- first required for CC-sink -- next it will be used to adjust 78L05 and further

The above circuits are a modification of double R-Diode input "bridge"

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Next the voltage reference at -- aa dumps it's excess to Op Amp.-s negative input -- bb

Another 2x R~D bridge that seems to have a capability to stand up to frequency variations ?

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Insane

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Positive feedback shunting regulator or custom zener

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Adjusting the fixed (3 terminal) voltage regulators

extends:: Adjusting the adjustable voltage regulator , Apr 5, 2015

(Std./)Simple v. :

with LT1086 (1.24V - adjustable) it gives seemingly errorless output ?

Op. Amp. v. :

it looks it is impossible to gain the ±2µV error level with just the one op-amp ►►
(the reference must be flawless as it shows on the graph. ???)
The Red LED-s are so cool for voltage adjustment -- their non-linear range begins below 275µA , they have sharper "turn on" than conventional detergents -- which puts them to (Diode,Stabistor,Red-LED,Zener Diode) this position - i assume . . .

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Update :: 2016-03-11 ► Insane :

 

seemingly "absolute" voltage reference at 1 Hz

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yet another constant current source

extends :: Re: Non real world Constant current sources Comparison

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Re - Custom Simple Linear Regulator

(extends:: Custom Simple Linear Regulator)
i may be an idiot but most voltage regulator circuits i've come across in internet appear to be too unstable or of not enough range for design target when simulated !! (usually the simulation appears to be the way batter quality than the real life build) so not enough range in simulation - is this for any use

so a bit of my research history on this subj. ::

first i thought that for successful design of a voltage regulator is required a good voltage reference ...

it may be that way but the precision voltage reference alone does not define a thing - more important is what you do with it or other words how you utilize it with respect of the rest of the circuit - so it turns out you can "define" your voltage without any specific voltage references - in the following test ::

the R4 is required for the simulation to run (for the circuit to be defined in the Solve Electric) -- i guess i added the diode for a zener - anyway this modified constant current source turns out to be very precise comparator for external voltage ::

wow -- a bad example -- anyway 1 of my early struggles -- the "comparator" is formed here by Q5 Q6 (Q9) if the TVP (test voltage point) increases the Q6 and Q9 start to open cutting off the Q11 ((?? all this for voltage reference ?? for precision constant current by J1 J-fet ... wow XD)) . . . so the Q1 has ??? high precision voltage on it's base and if PF gets too high the emitter-base current of Q1 reduces reducing the darlington's - Q2 Q10 - current - which in turn maintains PF in required limits - the circuit was never built as i found it too "expensive" or time consuming (along with tuning the real thing)

here's the latest zener ::

and what it's good for ::

???? -- running a scratch supply concept and testing various features -- everything is cool ? ? ? but to get only 20mA usable power (and who gonna build that . . . i'm out XD)

...

an alternative to a grid shown in ® Custom Simple Linear Regulator ::
the minimalist concept::

and minimal cfg for practical usage (the specs on the lower simulation do not apply to this grid - look the plots) -- doing the over current limiting here was a bit tricky


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