Luxeon 5V Vd-based driver

142

01:48:06

Vd of the rectifier seems to be WAY off, the "normal" diode config is too confusing for me.
I might be missing something simple, like how Vd of any diode is marginally influenced by the aamount of passing current.

It is supposed to simulate a 5V line, fullwave bridge rectifier IC (primarily to drop voltage but added safety is nice), 1W LED with 3.3 V Vf and 330mA If and a current limiting resistor which I want If to be ~ 250mA to avoid full If(/brightness/heat dissipated) but this shows a current around 100mA.

Not sure how accurate this is compared to the real world but I intend to find out (probably resulting in thermal runaway since my old 1W LEDs came without heatsink/PCB).

published 10 years ago

faceblast

10 years ago

yeah it's not going to be good. use a constant current sink instead

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