Current limiting circuit for adjustable negative voltage

Thread Starter

Shamoooot

Joined Apr 3, 2023
27
Hello

Following to my previous question about making a circuit that allows adjustable voltage output and current limiting, and using LM2596 I was able to limit the current for the positive voltage using the circuit:

1711130806169.png

But I am having troubles with the negative voltage, and it doesn't work:

1711130903749.png

Need help what am I doing wrong, or maybe it can't be done?
 

ronsimpson

Joined Oct 7, 2019
3,131
With out commenting on the current limit circuit:
See the red traces. They are not "ground" but -V. The opamp and RV1 and RV2 need to be connected to -V.
People often forget how to connect Vin. I believe it is connected as shown in blue. D3a to (0V)
Hope this helps. RonS.
1711132652515.png
 

Thread Starter

Shamoooot

Joined Apr 3, 2023
27
With out commenting on the current limit circuit:
See the red traces. They are not "ground" but -V. The opamp and RV1 and RV2 need to be connected to -V.
People often forget how to connect Vin. I believe it is connected as shown in blue. D3a to (0V)
Hope this helps. RonS.
View attachment 318166
Hey RonS

Thank you very very much, the negative voltage is working now!.

Now need to figure out the current limiting part.
 
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