I am looking for a simple way to digitally control a variable 5 to 38 volt supply for a biomedical application, with up to 0.5 amp load current. A helpful TI customer support person suggested the buf01900, but that only goes to 18 volts. I'm guessing that someone familiar with the TPS40170 understands my desired voltage ranges.
I am tired of twisting a knob on an otherwise automated application of an Arduino board. I want to have the Arduino control the output voltage directly. Conceptually, I would like to attach a programmable potentiometer to an LM317 adjustable regulator. However, the programmable pots I have found don't like to go above 5 volts on their terminals, and I want up to 38 volts out of the circuit driving the LM317. The LM317 can be driven comfortably by a 1 mA source. How does one make a power supply of up to 40 volts digitally programmable?
Thanks for any help you can give, and Season's Greetings!