- Joined
- Jan 14, 2011
- Messages
- 3,816
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- 63
Hey there everyone.
I got this driver (http://www.dealextreme.com/p/3-6v-9...rcuit-board-for-cree-and-ssc-leds-4-pack-3256) and it's pretty damn good. Unfortunately, I think I have encountered a bit of a problem with it.
You see, it runs normally at around 920mA. That's all fine and dandy, but I want to use this driver to run a 12x blu-ray, so I need to feed it between 450-500mA. So, I stuck some resistors on the positive output (my normal go-to modification so I don't have to do any SMD soldering) with a resistance equivalent to roughly 4.5 Ohms. Got the current to be about 450mA... until I kept it on longer.
The current gradually rose (a couple of mA every couple of seconds) until it got to 492mA and then I shut it off. But the problem is, I don't want to have it be a driver that increases current as on-time increases... that's dangerous.
I think the problem may be with the resistors I attached. They are normal, 1206 1/8W SMD resistors that I attached, but I put three 3.3 Ohm resistors in parallel (to give me 1.1 Ohms) in series with another three 10 Ohm resistors in parallel (to give me 3.333 Ohms) for a total of roughly 4.4-4.5 Ohms. However, I am thinking the reason it is increasing in current is because maybe these resistors can't handle the power I am feeding them? Or is there just a flaw in this method of modification?
Just so you know, I am using a 6x1N4001 and 10W 1 Ohm resistor for my test load.
Any answers? I don't want to end up killing a 12x 405... even though I don't even have it yet.
I got this driver (http://www.dealextreme.com/p/3-6v-9...rcuit-board-for-cree-and-ssc-leds-4-pack-3256) and it's pretty damn good. Unfortunately, I think I have encountered a bit of a problem with it.
You see, it runs normally at around 920mA. That's all fine and dandy, but I want to use this driver to run a 12x blu-ray, so I need to feed it between 450-500mA. So, I stuck some resistors on the positive output (my normal go-to modification so I don't have to do any SMD soldering) with a resistance equivalent to roughly 4.5 Ohms. Got the current to be about 450mA... until I kept it on longer.
The current gradually rose (a couple of mA every couple of seconds) until it got to 492mA and then I shut it off. But the problem is, I don't want to have it be a driver that increases current as on-time increases... that's dangerous.
I think the problem may be with the resistors I attached. They are normal, 1206 1/8W SMD resistors that I attached, but I put three 3.3 Ohm resistors in parallel (to give me 1.1 Ohms) in series with another three 10 Ohm resistors in parallel (to give me 3.333 Ohms) for a total of roughly 4.4-4.5 Ohms. However, I am thinking the reason it is increasing in current is because maybe these resistors can't handle the power I am feeding them? Or is there just a flaw in this method of modification?
Just so you know, I am using a 6x1N4001 and 10W 1 Ohm resistor for my test load.
Any answers? I don't want to end up killing a 12x 405... even though I don't even have it yet.
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