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Old 04-06-2012, 10:30 PM #1
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Default 5 mode LED driver with a 405nm build?

Would it be okay for me to use this driver from DX: 5-Mode LED Driver Circuit Board for Flashlight (DC 0.9~4.2V) - Free Shipping - DealExtreme
in my next 405nm build @ 420mA?

2 reasons:
It's super cheap
It has 5 modes which I find nice

I was planning to use this driver instead of a boost driver with 1 14500 battery.

If not, oh well:P


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Old 04-06-2012, 11:25 PM #2
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Default Re: 5 mode LED driver with a 405nm build?

I think some people have had success using those in the past but I'm not 100% sure

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Old 04-06-2012, 11:56 PM #3
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Default Re: 5 mode LED driver with a 405nm build?

you need to make sure the diode can run at 3% power like it says one of the modes is.
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Old 04-07-2012, 08:58 PM #4
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Default Re: 5 mode LED driver with a 405nm build?

Hmmm, I was planning to use a S06J Diode @ ~420mA but here are the testing results

Vf-----ma-----mW
3.96----50-----32
4.3-----75-----71
4.56---100----108
4.8----125----146
5------150----188
5.18---175----228
5.32---200----266
5.45---225----307
5.55---250----345
5.65---275----384
5.73---300----418
5.8----325----457
5.86---350----495
5.91---375----533
5.96---400----564
6------425----595
6.04---450----633
6.08---475----670
6.11---500----701

So I'm guessing I would need at least a forward voltage of 6? A single 14500 battery is only at max 4.2V:/ I guess I'll need to use a different host and driver in order to run this diode at 420mA? Correct me if I'm wrong. I'm still learning:P
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Old 04-07-2012, 11:12 PM #5
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Default Re: 5 mode LED driver with a 405nm build?

Sometimes you have to do a bit of guesswork to figure out exactly what type of driver you're looking at. Here are some clues / deductions:

1) This one takes an input voltage of 0.9 to 4.2V. If it's meant to drive an LED, that's certainly going to be a higher Vf than 0.9V. So you know, at the very least, that this is a BOOST driver.

2) An LED is probably also going to have a Vf that is lower than 4.2V. So it's possible that this driver is also a BUCK. However, the fact that they cap it at 4.2V, instead of giving you the option of going with 8.4V, makes me a little cautious about treating it like a buck driver. Many ICs that are BOOST and BUCK cap the bucking at an input of ~5.5V.

So, thus far, I would only be confident in the fact that it can at the very least BOOST. The next questions that you need to answer are:

A) Whether something that can boost 0.9V to ~3.5V, can also boost from 4V to ~6V. You're not likely to find the answer to that question by any means other than testing. I think there's a decent possibility that it will, but there's also a decent possibility that it won't.

B) Whether this is constant voltage or constant current. The "specs" say that the current is "420mA +/- 50mA". That's a pretty specific figure to be giving if it was a constant voltage driver that had variable current based on a LED's IV curve. So my money would be on constant current (which is good). But, again, you'll want to use a good test load to verify.
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Old 04-08-2012, 03:46 AM #6
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Default Re: 5 mode LED driver with a 405nm build?

Hmmm... so if it were a boost driver, it would draw the required voltage from a single battery, correct? I know this diode needs a higher Vf than a 445nm M140 diode, so I might just go ahead and get the ben boost driver or a microboost(what are the dif's anyways?)

Thanks everyone! This is a great forum and community
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Old 04-08-2012, 03:54 AM #7
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Default Re: 5 mode LED driver with a 405nm build?

Hey man,

I attempted this with a linear 3 mode LED driver here: FandyFire XG-V5 405nm 3 Mode Build in the quest for high power drivers with modes.

as you can see, the power is soo low because the Vf of the laser diode (S06J) is a bit higher than the LED the driver was intended for.

Hopefully the driver you linked to can boost to higher voltages tho, it looks like it has a inductor ontop so there is hope!

Have you purchased the driver yet?
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Old 04-08-2012, 07:13 AM #8
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Default Re: 5 mode LED driver with a 405nm build?

Quote:
Originally Posted by Fiddy View Post
Hey man,

I attempted this with a linear 3 mode LED driver here: FandyFire XG-V5 405nm 3 Mode Build in the quest for high power drivers with modes.

as you can see, the power is soo low because the Vf of the laser diode (S06J) is a bit higher than the LED the driver was intended for.

Hopefully the driver you linked to can boost to higher voltages tho, it looks like it has a inductor ontop so there is hope!

Have you purchased the driver yet?
Ahh, I see. What was the the mA set at with your driver? No, I haven't purchased the driver yet :/
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Old 04-08-2012, 09:21 AM #9
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Default Re: 5 mode LED driver with a 405nm build?

it was a fixed current driver, it was designed to run at ~1000mA but because of the Vf of the 12x 405nm diode, it would only be pushing tiny amounts of current, like 50mA or something, well inside the threshold i think.

i might purchase a couple of the different types of mode drivers to play with
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