Electronics Tutorial - The TL431 Part 1/3 - Getting to know the component`

#58 In this 3 part electronics tutorial I want to look at the TL431 programmable precision voltage reference IC - see how it works, look at some simulation models and finally simulate some circuits using LTspice.
Here are the other videos in this little mini-series:
Part 1: • Electronics Tutorial -...
Part 2: • Electronics Tutorial -...
Part 3: • Electronics Tutorial -...
Datasheets:
www.ti.com/lit/ds/symlink/tl43...
www.onsemi.com/pub/Collateral...
e2e.ti.com/support/power-manag...
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Music:
The Builder by Kevin MacLeod incompetech.com
Creative Commons - Attribution 3.0 Unported - CC BY 3.0
Free Download / Stream: bit.ly/_the-builder
Music promoted by Audio Library • The Builder - Kevin Ma...

[@rvamerongen]

Great video, wish that there where more video’s like this series on the web. Thank you

[@cellularmitosis2]

Thanks so much for going in depth on this old part!

[@FesZElectronics]

Thank you! It may be an old component, but its still widely used.

[@dbuezas]

Super informative video, thanks for creating this!

[@mojtabajamal3457]

nice job as ever

[@satd2024]

Useful video thanks

[@shahzaibshamim6524]

will you do tutorial on ADC? I want to make one for my microcontroller project, my signal is between 1.5V and 3.5V but I want to utilize full adc range for each channel.

[@FesZElectronics]

@Shahzaib Shamim Well, most modern Micro-controllers already have built in ADC's; the datasheet should offer information on this topic. What uC are you using?
So I think what you need is a circuit that turns the 1.5-3.5V into the supply range of the uC so 0-5V or 0-3.3V (depending on what you are using). If the range is 0-5V you can simply use an op-amp circuit that amplifies by 2.5x and centered around 2.5V and that will convert the 1.5-3.5 directly to 0-5V.

[@johnaweiss]

5:02 By "open loop", do you mean, without feedback? Is the unity gain point the frequency limit of the part?
Re noise, which part would be better for a lithium battery charger, OnSemi or TI?
thx!

[@mrsc1914]

Quite a bold thing you're up to. How close do you think you'll get ? I never knew ltspice sims could get close to reality...

[@FesZElectronics]

Well, we'll see next week how close I get.
But regarding simulation accuracy in general, its all about how complex and well made the model is and how well you include all the parameters of the circuit (the parasitics that are normally ignored). The simulation can be fast or accurate. The more accuracy, the slower it will work. I will try to find a balance between the 2.

[@mrsc1914]

@@FesZElectronics Lately i've been wondering if the discrepancies are more about our math having gaps. However, it could totally be as you say, that the sim just needs to be more accurate. with the mag amp thing I found that when multiple signals get in the same place it gets hairy. Which in turn has me thinking about filters and Fourier representation. The way a cap reacts to multiple signals could be a particular function. Additive / subtractive synthesis?? in a sense it's acting like a mixer, but in the gilbert cell(which does not have reactive components) the way which the signals interact is clearly chosen/understood. Physical objects/signal paths may also exhibit similar behavior, but the transfer functions may not be as clear. Hope that made any sense, lol . I've been seeking a way to model this so I can share the anomaly with others so we can all think on it together. Maybe, its just something I haven't learned yet :)

[@mariusb_ro]

Hi! I like your level of the information, is quite advanced what you present to us. Are you Romanian? your accent seems like you are :)

[@FesZElectronics]

I'm happy you are enjoying the videos! Da, sunt :D

[@mariusb_ro]

@@FesZElectronics ești bun! bravo :)

[@reynolds087]

Could you share the files for your custom TL431 model? Would be nice to have your verified version if possible.

[@FesZElectronics]

I added a link in the description of Part2.

[@reynolds087]

@@FesZElectronics Awesome; thank you!

[@incxxxx]

Very interesting! But still I do not understand what are you doing. What these strange circuits should show?

[@FesZElectronics]

I'm not sure I understand. What exactly should I clarify?