Low cost DC-LED driver circuit schematic

Industrial Router Crystal 3.2*2.5mm 3225 26M (26.000MHZ) 12PF 10PPM 20PPM 30PPM

AVX tantalum capacitor low resistance TPSD107K016R0100 original 2011+

SMD LED

Overview:
The DC-LED driver circuit is a power supply circuit that controls the power required to illuminate an LED (Light Emitting Diode). The forward voltage drop (VF) of the LED changes with manufacturing error and ambient temperature, and constant voltage drive cannot be used. Therefore, it is generally necessary to use a constant current drive to keep the current supplied to the LED constant.
(Please read the PDF for details)