This is my first post here.
I just made this a while ago and haven't test it yet.
My main intention was to use this circuit to power my 3W LED for my project.
The goal is to keep component count minimal and no special-chip being use.
Top red trace is the input power from battery, and bottom green one is output at the LED.
The circuit is configured as constant current SMPS, with V2 as Vref.
A Sziklai-pair is being use as switcher.
I might use a common LM311 comparator for the circuit.
The problem is, the efficiency is not as high as I expected.
Well, maybe 90%?
Is there anything that I can tweak?
Thanks...
Afdhal Atiff Tan