Hello Team,
1. I need an adjustable current source design of 0 - 2 A at an voltage of 5V.
2. And I need the control over the current selection to be from MCU using its DAC or something like that.
Kindly suggest me an design approach to this.
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Hello Team,
1. I need an adjustable current source design of 0 - 2 A at an voltage of 5V.
2. And I need the control over the current selection to be from MCU using its DAC or something like that.
Kindly suggest me an design approach to this.
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.
Hi,
1. LDOs is from a different product line. Could you please open a new thread with the device name?
2. Yes. When you use a buck, you may want to use additional circuitry to control the load.
Regards,
Febin