Help me PSU with output of 0-12V 1A using only discrete components

Status
Not open for further replies.
S

Splitfoot

Newbie level 3
Joined
Mar 24, 2012
Messages
4
Helped
0
Reputation
0
Reaction score
0
Trophy points
1,281
Activity points
1,305
I have been trying to design a bench PSU using only discrete components. The input will be 16-20v and I need to output 0-12v 1A with current limiting.
So far I have managed to get

Q3 and R6 are supposed to control the current limit at 1A but I don't think it is working, where am I going wrong with this?
Thanks in advance for any possible help.
 

Attachments

  • Capture.JPG
    138.2 KB · Views: 95

Re: PSU design, 0-12V 1A

Dear Splitfoot
Hi
You need to use a darlington pair at the out put . to be ensure that , that current will given . but here are better ways , with op amps and some simple transistors or etc , is it important to use that circuit exactly ?
Best Wishes
Goldsmith
 
Re: PSU design, 0-12V 1A

It is not important that I use that exact circuit, the only requirements are that I only use discrete components to achieve the desired results.
 

Re: PSU design, 0-12V 1A

What do you mean by discrete component ? has op amp , any problem for you ? ( op amp will use at feed back loop and the series pass element is transistor ) .
 

Re: PSU design, 0-12V 1A

An op amp would be no problem, I just can't use any ICs that have a built in current limiter or something like that.
 

Re: PSU design, 0-12V 1A


You can use top circuit , you can control the vout and iout simply .
Best Wishes
Goldsmith
 

Re: PSU design, 0-12V 1A

Which area are you referring to when you say the "top circuit"?
I don't really understand how the circuit you posted works.
 

Re: PSU design, 0-12V 1A

Which area are you referring to when you say the "top circuit"?
Click to expand...
What do you mean by that ?
And about the action of that circuit , i designed that circuit according to the LDO configuration .
Which section of that isn't clear for you ? I'll illustrate that section for you if you tell me .
Best Wishes
Goldsmith
 

Status
Not open for further replies.

Similar threads

Menu
Log in
Register
Cookies are required to use this site. You must accept them to continue using the site. Learn more…