| Electronics > Beginners |
| 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 --- End quote --- 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. --- End quote --- 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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