Okay guys. Need a little help here. I found a driver for a project I'm working on but I have a couple questions about it. It accepts 10.8 - 35 vdc in and gives 35-63 vdc out. There is an adjustment for voltage and current. Current is adjustable from 0.5 to 2.5 amps. I'm good with the voltage adjustment but don't understand how the current adjustment would work. If someone could explain how to adjust it that would be great. Also it states that its good for 100 watts. Would that mean that if I was running XM-L2 leds at 2500ma and the forward voltage of the LEDs is about 3.2 they would be running at 8 watts and I could run 10 leds in series and be safe? Thanks for the help everyone.
Help with LED drivers
- Thread starter 72turbo74
- Start date
Difficult to say without seeing the data sheet for the actual driver you are looking at.. Can you post a link to where you are seeing this driver?
MikeAusC
Enlightened
10 in series means you'll want 32 volts at at 2500ma - that's 80watts - so it's within the power ratings.
As it's a boost converter, it'll work with the input less than 32 volts.
The power to an LED is controlled most easily by setting the current going through it, so set the current to 2500mA and set the voltage around 34 volts.
If you set the voltage higher and there's a break to the wiring or you connect input with no LEDs connected the output capacitors will charge to a high voltage and when the LEDs are connected they will force a cuurent surge through the LEDs, as the capacitor current is not limited by the current setting.
As it's a boost converter, it'll work with the input less than 32 volts.
The power to an LED is controlled most easily by setting the current going through it, so set the current to 2500mA and set the voltage around 34 volts.
If you set the voltage higher and there's a break to the wiring or you connect input with no LEDs connected the output capacitors will charge to a high voltage and when the LEDs are connected they will force a cuurent surge through the LEDs, as the capacitor current is not limited by the current setting.
Very cool. Thanks for the info. How would I check the current output with a meter? I don't understand how I would adjust the current knob to a certain amperage. If I had 10 LEDs in series and wanted them set to 2.0 amps would I just do an amp draw test between V-out from the driver and the positive of the LED and adjust the driver knob until the meter reads 2 amps? Is it that easy? Here is a link to the driver.
http://www.amazon.com/dp/B00CD19TWO/?tag=cpf0b6-20
http://www.amazon.com/dp/B00CD19TWO/?tag=cpf0b6-20
Quatermass
Newly Enlightened
- Joined
- Aug 26, 2013
- Messages
- 4
Sounds right to me.
BTW, 10x 3.2V is only 32V. You indicated the output min. is 35V?
Ok each LED will vary slightly. But usually by +-0.1V.
Should average out.
BTW, 10x 3.2V is only 32V. You indicated the output min. is 35V?
Ok each LED will vary slightly. But usually by +-0.1V.
Should average out.
MikeAusC
Enlightened
Yes.
Firstly adjust the output voltage at open circuit to 34 v and set the current to minimum.
![Pampers Sensitive Baby Wipes, Clinically Proven, Fragrance Free, Unscented, Water Based, Hypoallergenic, Multi-Use, Hand Wipes 336 Wipes Total (6X Flip-Top Packs) [Packaging May Vary]](https://m.media-amazon.com/images/I/41KLBHu9CAL._SL500_.jpg)
Thanks for the tip MikeAusC. Good call on the 35 volt min. I'll have to add an LED or something. What would happen if a string of 10 XMLs in series were getting 3.5 volts at 2.5 amps instead of the 3.2 they call for? Would they be damaged or be okay? Now to hijack my own thread I have another question. Say a guy had 2 XML LEDs and a 2.1 amp LuxDrive BuckBlock driver. I understand that if wired in series that they would each get 2.1 amps. Does that mean that if wired in Parallel they would each get 1.05 amps? Thanks for the help guys.
