rgbphil
Enlightened
Hi,
I'm looking for good data on the forward voltage vs junction temperature characteristics of medium (~50mA-150mA) to high power (>=350mA) LEDs at a fixed current or any other data detailing the operating characteristics of LEDs at diferrent juction temps, eg power vs Tj would be OK depending on the measuring cct.......(If v Tj at a fixed Vf wouldn't make much sense, Vf will vary regardless, however If can be controlled).
Anyway, looking to design a cct that can predict the most reliable current/voltage to drive an LED or LED array under variable thermal environments (eg sometimes bad heat sinks...sometimes good....sometimes excessive ambient heat, sometimes good convection cooling etc). I'm guessing the characteristic curves will show some sort of indication of when an LED is driven too hard, some sort of sweet spot.....I hope it's not too linear!
Phil
I'm looking for good data on the forward voltage vs junction temperature characteristics of medium (~50mA-150mA) to high power (>=350mA) LEDs at a fixed current or any other data detailing the operating characteristics of LEDs at diferrent juction temps, eg power vs Tj would be OK depending on the measuring cct.......(If v Tj at a fixed Vf wouldn't make much sense, Vf will vary regardless, however If can be controlled).
Anyway, looking to design a cct that can predict the most reliable current/voltage to drive an LED or LED array under variable thermal environments (eg sometimes bad heat sinks...sometimes good....sometimes excessive ambient heat, sometimes good convection cooling etc). I'm guessing the characteristic curves will show some sort of indication of when an LED is driven too hard, some sort of sweet spot.....I hope it's not too linear!
Phil