Hi,
I'm looking for a 12 V (nominal) DC/DC converter where I can control the output voltage (by +/- 10 %) using a DC voltage control signal. I have seen numerous DC/DC converters that have a TRIM pin that allows the output voltage to be set by connecting an external resistor.

Ideally, I would like the converter to be able to handle 3 A or more and is PCB mount. If there are any suggestions, I would greatly appreciate them.

Thanks

 

What is the input voltage?

Do you need ground isolation between the input and output.

 

The input voltage is between 8-20 V or so, ground isolation is not necessary.

 

To generate 12V output from 8-20V input and if you don't need ground isolation, you could use a buck-boost type converter (a sepic converter is one example). I don't know if such a device is available already built but if you search for "sepic converter" or "buck-boost converter) you will find information on that.

Edit: To adjust the voltage a small amount, you can sum a DC voltage into the summing point for the error correction amplifier in the switching regulator IC.