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| High power LED damage reasons |
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| roman.isaikin:
Hi! Burned down a 500$ LED today (YJ-BC-270H-G02-56-G/S) and trying to figure out what I did wrong. It was connected to TTi CPX-400S 60V/20A 420W power supply, so my assumption was that it cannot damage it, because power limit would be hit first. Obviously this is not true.. Power supply was in CC mode, I cranked up the current knob a little bit too fast and short circuit protection triggered. Could it be that some of the die's didn't had time to heat up evenly and caused Vf drop (assuming that LEDs have negative temperature coefficient, can't seem to find that far sure). Or maybe 40cm wire inductance caused an instability in the power supply current controller. Either way would it have helped to set PSU voltage protection on the 40V or not? |
| Benta:
Silly question perhaps, but is this the model with thermal radiator and fan, or is it the one without? |
| rpiloverbd:
Hello, Sorry if I am wrong. YJ-BC-270H-G02-56-G/S can withstand 35V- 42V input voltage, right? Was the power supply giving 60V input to it? Without any current limiting resistor? |
| Benta:
OP states that the power supply was in CC mode. No need for resistors. |
| roman.isaikin:
With the radiator of course. Theoretically it can output more than the LED is rated for, I'm just trying to figure out why would that happen in CC mode + 420W power limit of the PSU and whether setting an overvoltage protection or cranking up the current more slowly would have helped. |
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