TL431A Precision Programmable Voltage Reference

We present a brief overview of the TL431A precision programmable voltage reference, and demonstrate two of its many possible circuit configurations. We were going to demonstrate THREE of its many possible circuit configurations, but the raw video that I shot of the first demo was accidentally deleted, and I don't feel like reshooting it.
Link to the Texas Instruments datasheet:
www.ti.com/lit/...
Network XIII: Electronics projects, demos, builds, and teardowns for hobbyists and makers. All are welcome.

[@psanmuk]

Thank you,To put it simply, you're brilliant!

[@NetworkXIII]

Thank you so much, I’m happy that you enjoyed it.

[@andymouse]

Nice tutorial...cheers.

[@NetworkXIII]

Thank you, glad you enjoyed it.

[@ManjinderSingh-o4t4s]

Please Can you make more videos like this . Nobody has explain the way u do. I really appreciate 🙏🏻.
Please I would have been fantastic if give us a little more detail about the circuit

[@dannyjensen4954]

Thanks so much for this great video

[@NetworkXIII]

Thank you for watching, and commenting.

[@leon-j6s]

Thank you, very helpful

[@murattekin6111]

Thank you soo much.

[@acestudioscouk-Ace-G0ACE]

Thank-you so much for this! I've just semi retired as a commercial photographer and am getting back into being a radio ham (G6XiB) and learning electronics. I've just bought 100 TL$431 for a project and was wondering how they work and what to do with the spare ones. You mention "we"; is network 13 a group of people? Tnanks again and best 73s.

[@NetworkXIII]

Thank you for your comments. Network XIII is just me, I picked up using “we” from my ham radio days many decades ago.

[@leonakiki3267]

can you re upload the video or the exposure, the white is washed out and can barely see your drawing , I can see more when your hand casts a shadow

[@NetworkXIII]

Leona KiKi Send me an email at [e-mail] and I will forward copies of the drawings to you. Please reference the title of this video.

[@littlegeniusplayschool459]

Hi sir, what will happen if vref goes much higher than 2.5 volts. Thanks

[@NetworkXIII]

According to the datasheet, depending on conditions, cathode pin voltage will decrease by ~1mV for every +1 volt change in Vref. A link to the datasheet is posted on www.network13.contact

[@AniDeGrootForReal]

I was asked to use the TL431 to provide a stable Vref for a difference amplifier. However, I need that Vref to be 1.5 V. Am I correct that the TL431 cannot provide an output voltage of 1.5 V?

[@NetworkXIII]

Yes, the minimum Vout for the TL431 is 2.5V.

[@robertneill3057]

Can use a medium current/power transistor wired as an amplified diode. There are 2 potential divider resistors placed across the collector, base, and emitter leads of the transistor. Use is similar to a zener diode with a series limiting resistance. Make sure the total potential divider resistors are about 10 times the limiting resistance value for satisfactory performance. Equal resistor values produce about 1.2 to 1.3 volts.
Potential divider output voltage calculation:
0.65 × (Rpd1 + Rpd2) ÷ Rpd2

[@svetlanalinuxenko4234]

Hi :) I'm trying to make a voltage reference using this thingy. Unfortunately, it is quite difficult to get stable , 2.5v reference . It seems like different values of a resistor influence its output. Could you plese tell me, is it requires anything else to get 2.5v ref than simple connect 1.5k R to vsup and vref with vsup together ?

[@NetworkXIII]

404 Not Found What is your supply voltage? The resistor value must be chosen to provide enough bias current for the part to work correctly, which is a minimum of 1mA.

[@svetlanalinuxenko4234]

​@@NetworkXIII You're correct, it requires about 1mA to work properly. About the issue, it is a bit funny story, the battery of multimeter was very weak, I think it measured entropy lines of middle universe very precise, then I replaced the battery and everything get work just fine in this world, the 2.5 voltage was and is stable as a .. Anyways, thank you for the help, it is very imporatnt sometimes to complain especially if someone is listening, I appreciate it )) Thank you

[@ponnayirasundaravelsomasun1075]

Please add tl431 in a dc dc converter Isolated power supply SIR.

[@EPaulIII]

With a price of around $0.50 in quantity of one from legit suppliers, why E-Bay??????????

[@NetworkXIII]

I just checked my purchase records, I bought 20 of these parts from an eBay seller for 99 cents, with free shipping. Network XIII is a shoestring operation, so for example if I purchased 20 Texas Instruments TL431As through Digi-Key, I would have paid over ten dollars with shipping. I appreciate your concerns, and if I were designing this into a piece of equipment I would use a genuine part from TI, On Semi or STMicro. For my purposes as a hobbyist, however, these off-brand, mistrimmed parts are more than adequate.