Continue to Site

Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

Feedback loop of TL431 based linear regulator?

Status
Not open for further replies.

cupoftea

Advanced Member level 6
Advanced Member level 6
Joined
Jun 13, 2021
Messages
3,041
Helped
62
Reputation
124
Reaction score
139
Trophy points
63
Activity points
15,918
Hi,
Is the feedback loop of the attached 60v to 5v linear regulator the way you would do it?
I am treating the TL431 like a “normal” opamp.
 

Attachments

  • 5V Linear regulator.pdf
    184.1 KB · Views: 231

You can do it that way but what does the 5V rail have to supply power to? If it is just the circuitry shown you can probably manage without the two pass transistors. If the load is fairly constant you can probably remove the capacitors from around the TL431 as well as the supply should be clean of transients. There is no power advantage to dropping 55V this way, you could use a single resistor and Zener diode, the V*I in the dropping components will be the same.

Brian.
 
Thanks, sorry i should have said, it could be up to 10mA flowing in that opto....then again, maybe as you suggest, i could use less components and just use a TO220 NPN /zener/resistor...

...than again, i may just leave it like it is...but....
Make R38 = 0R
Not fit C38, C37, R40, C36, R39, R37, C25

...I mean, d'you think for this low power with just 10mA, i can do without the feedback compensation?
 

Status
Not open for further replies.

Similar threads

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Back
Top