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| Constant Current LED Driver - BJT |
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| bullonwheels:
Hello All, I am designing a constant current LED driver for driving multiple LED's each having the following circuit: Any issues I would face or any changes required? VG1 = 2.4V VG = 4.2V D1 would have around 0.65V drop similar to VBE across drop. |
| FenTiger:
That's a lot of parts per LED. How many are you driving? Would you be better off putting them into longer series strings? |
| T3sl4co1l:
What's R2 for? Tim |
| OM222O:
how about using an op amp + a BJT / mosfet in order to do that? you just need a high voltage supply. you can also use constant current LED driver ICs (both linear and switching) which usually ends up being cheaper actually. |
| Zero999:
--- Quote from: T3sl4co1l on July 11, 2019, 02:32:17 am ---What's R2 for? Tim --- End quote --- To reduce the power being dissipated in the BJT maybe? |
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