LT3083 as current booster

Before I completely give up on LT308X parts maybe I can try to use one LT3083 as I need 4.5A & hoped that this was also a better way of using the LT3083 as using it in voltage out mode is proving problematic - it's not regulating correctly

According to the LT3083 datasheet this example gives 4.5A current output @ 3.3V

Two questions:

- I presume I could use this with an any adjustable voltage regulator - it doesn't have to be fixed voltage output & there's no special adjustment to make for this?

- the LT3083 is operating in current mode which is determined by the connection of the SET pin through 20mohm to OUT pin through 10mohm R. But the SET pin has 33K R to ground just as if it was operating in voltage mode (2.5V output, I believe) - so what is this 33K for - if the LT3083 was operating in voltage out mode (3.3V) this would be 66K, not 33K ?



According to the LT3083 datasheet this example gives 4.5A current output @ 3.3V
[edited by: dweeb99 at 12:08 PM (GMT 0) on 8 Feb 2020]