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.

Register Log in

Does current limiter counted as a stable current source?

Status
Not open for further replies.
H

Hitotsu

Junior Member level 2
Joined
Apr 29, 2009
Messages
21
Helped
0
Reputation
0
Reaction score
0
Trophy points
1,281
Activity points
1,405
stable current source

If not then how can i acheive a stable current source? Current Mirror?
 

current limiter is not a current source. fuse is an example of current limiter. current mirror is a current source.
 

current limiter is not a current source
Click to expand...
You possibly don't know it, but there are semiconductor devices designated "current limiter diodes", e.g. former Siliconix CRxxx, Microsemi 1N52xx series. They are basically JFETs with internal source resistor, well suited as true two-pole current source. Unlike a current mirror, they source fairly constant current also with varying voltage.

At a higher current level above several mA, adjustable voltage regulators as LM317 can be used as two-pole current source. More complex circuits can work at any current level and also meet higher accuracy requirements.
 

FvM is very correct. However, these diodes which I have used, are not all that precise. If you want precision you will have to use a bandgap reference in an op amp circuit.
 

Thanks for the information, i shall go research on what you all had mention
 

Status
Not open for further replies.

Similar threads

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Back
Top