Hi guys
Please anyone know how to work this driver?
I can not understand how is possible that have 5 modes (Hi/mid/low/strobo/sos) without MCU :-/
Only see 4 sense resistor + 1 resistor + 1 capacitor and a mini mosfet ….
Many thanks
Bump
If it has 1 mode then it was a lie in the listing, something many chinese sellers are good at, fake lumen numbers and fake LEDs are good examples
The 3-legged MOSFET you mentioned is actually a mini controller. It’s not a standard design - I think someone actually designed and mass produced it just for FL purpose. Generally rated around 1-1.5A (it controls current directly).
Search for “CX2859 IC” and you will find more details.
Thank you very much everyone for your answers 
Now yes! The CX2859 IC is not a simple mosfet 
Thanks again