Hi guys,
I'm looking at a few different circuit ideas to drive a fan, that's proportional to temperature. One method I've been thinking is by using an NTC resistor, with some amplifying electronics, to drive the input of an LT3080 SET pin (
https://www.analog.com/media/en/technical-documentation/data-sheets/lt3080.pdf)
However, this will only be possible if I can provide a voltage across the SET pin and ground, rather than using a current set resistor like you're supposed to. The current set works by an internal 10uA current source, which then drops a voltage across the resistor. This, obviously, drops a voltage across this resistor which is then used as a reference for the internal op amp.
Can I simply drive it with a voltage? In simulation, this works, but I'm worried I might kill something in real life. Here's a simulation attached to show the idea (there's also a pregulator switch mode too, since the input is over twice the output of the LDO, to keep things cool).
I'd appreciate any help, if this is possible, I think it's a nice cool circuit!