Hi,
I'm designing LED driver in my pulse oximeter. It would be two LED's, I would like to auto adjust current by DAC and be able to turn off one LED at time. I came up with an idea. In simulation, I got what I wanted. What about real circuit? The mosfet is actaully IRLML6244TR. 5V is for. ex. MAX619 from two AAA batteries. DAC has 3.3V logic and is powered by 3.3V DC-DC pump.
LED are IR and RED SMD, max 20mA.
IRLML6244TR
I'm designing LED driver in my pulse oximeter. It would be two LED's, I would like to auto adjust current by DAC and be able to turn off one LED at time. I came up with an idea. In simulation, I got what I wanted. What about real circuit? The mosfet is actaully IRLML6244TR. 5V is for. ex. MAX619 from two AAA batteries. DAC has 3.3V logic and is powered by 3.3V DC-DC pump.
LED are IR and RED SMD, max 20mA.
IRLML6244TR