D1 and D2 are simultaneously shorted out by the FETs......doing this diverts current away from the LEDs...and hence dims them.
The circuit works well, but has this "blemish" 70us after start up.................after this it behaves beautifully....(on the sim).............but i wonder of the blemish is the harbinger of future poor operation?
I am definetely not trying to do syncronous rectification here, or active rectification.
...i am simply dimming the leds by periodically diverting the current away from the leds, and through the loop contained by the two fets