Adjustable Current source 0-2A

Hi,

From your description, any buck converter rated for 2A can do this job. However, for proposing the right device, I would like to know the Application or End Equipment. 

If you have a block level design please share it with us.

Regards,

Febin

Hi,

Thanks for the suggestion,

And how do I limit the current/vary the current ?.

Currently I don't have any block diagrams that I can share here. 

I will be using this adjustable Current source to simulate load voltage drop across resistors and inductors( end equipment ) , which is monitored by an MCU ADC to see the voltage drop across the load.

Hi,

If I understood correctly, you want to use a buck converter as a varying current source. Is that correct?

I am still not sure what you want to achieve. Could you please share a rough sketch of the design?

Regards,

Febin

Hi,
Yes, i want to use a buck converter as a varying current source.

Kindly refer the attached block diagram for the application.DDV_CURRENT_MONITOR_BLOCK_DIAGRAM.pdf

Hi,

It looks like you want a controllable current source. With a buck converter you can only adjust the voltage. The converter has no control of the current that is drawn from it. In my understanding you cannot achieve a controlled current source with a buck converter. 

Let me share an App note with similar concepts. Hope that will be useful for you during the design phase.

https://www.ti.com/lit/an/snoaa46/snoaa46.pdf?

Regards,

Febin

Hi,

1.What about using Linear regulators, it should be having control over current adjust and limit , which can be shunt or series based linear regulators. For example LM317. So is there an device which can provide 0-2A control as well as 28V to 5V regulation in  Linear ?

2. what I have understood : If I use Buck converters and I have to add additional circuitry at the output like the reference note you have provided to control the load current.