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TL431 linear power supply

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spec:

--- Quote from: IanMacdonald on December 14, 2018, 12:38:02 pm ---The main issue with amplified IC regulator arrangements is high volts drop. The LM317 has a rather high burden voltage in itself, and adding a further transistor and series resistor considerably worsens that. Although, it is a workable arrangement if top efficiency is not important.
--- End quote ---
Yeah, that and the temperature cut off. :)

spec:

--- Quote from: T3sl4co1l on December 14, 2018, 05:56:17 pm ---
--- Quote from: spec on December 14, 2018, 08:08:36 am ---I take it then that you yourself or anyone that you know has built a successful TL431 PSU.

--- End quote ---

Good evening spec,

Have you? :)

Tim

--- End quote ---
Good evening to you too Tim.
Apart from the obvious vref applications in a benign environment, I have never been able to do anything with the TL431 and its family. So, I am biased and, for me it is one of those avoid chips. I wrote a critique of the 431 on ETO a couple of years ago, but can't seem to find it.

mike_mike:

--- Quote from: mike_mike on December 13, 2018, 01:25:36 pm ---I just need something like a error amplifier controlling one or more transistors (npns), a ref voltage, a current limit (not variable). Also I want to have a output current of about max 5A and a voltage of ut 3-25Vdc. A overload protection led should be very useful, but only

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Here I wrote that I need a current limit.

spec:

--- Quote from: mike_mike on December 14, 2018, 07:21:48 pm ---I need current limiting. I dont need current limiting led.
I need something like a transistor and a power resistor for current limiting. And I dont need that the current limit to be variable.

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Got it. I just read all your posts on this thread and afraid I misread one of them. I am having one of those days. |O  Will see if I can pop in some current limiting on the version three circuit (reply #45).

T3sl4co1l:

--- Quote from: spec on December 14, 2018, 07:32:44 pm ---Good evening to you too Tim.
Apart from the obvious vref applications in a benign environment, I have never been able to do anything with the TL431 and its family. So, I am biased and, for me it is one of those avoid chips. I wrote a critique of the 431 on ETO a couple of years ago, but can't seem to find it.

--- End quote ---

Basic scheme has already been mentioned:



(I do in fact sometimes draw schematics; most of these are from my back catalog, hence the simple style.)  Which the OP has already been set on the path too -- everything else is just an embellishment of this: adjustable voltage, current limiting, beefed up follower, better pull-up bias, etc.

It's just a three-terminal op-amp, no mystery to it. :-+

Tim

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