Hi all, not really sure what to call this. (Or I'd search the web and find something.) I'm sending about 50 watts to a heater (~50V @1 amp.) I was going to do a current control thing, (see top pic here.)
But that puts about 1W into the current sense resistor at max power.
So I drew the bottom drawing, with a transistor to sorta level shift the output up near the 50 V rail. (Bottom picture.) Is this kosher? I need to switch the opamp inputs. Is there a better way?
Thanks,
George H.