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Old 03-04-2011, 06:45 PM #1
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Default What driver do you recommend for 1.5W?

Hi, i am going to be building a 1.5W 445nm laser, i will be powered the diode at 1.5A and i want to know what driver you recommend for it. Can i have a link too please.

Thanks


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Old 03-04-2011, 06:55 PM #2
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Default Re: What driver do you recommend for 1.5W?

That depends on which and how many batteries you are planning to use.
And that in turn depends on the host you are planning to use....
So, once you have that figured out, a driver recommandation can and will be made.
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Old 03-04-2011, 06:57 PM #3
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Default Re: What driver do you recommend for 1.5W?

well, i am making a "lab" style laser. I am getting a box which can fit a nice big heatsink in. Size is not a problem, so i can use any batteries. I was thinking of 1 or 2 18650 3.7v batteries. If i used a flex drive maybe? I am not sure really what i am talking about though with drivers that why i have asked you.
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Old 03-04-2011, 07:06 PM #4
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Default Re: What driver do you recommend for 1.5W?

Well if you have a lot of free space and hence freedom in your choice of batteries,
you can just whip up a LM317 driver, it is the cheapest and works fine.
Have you visited the 2n link in my signature?
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Old 03-04-2011, 07:30 PM #5
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Default Re: What driver do you recommend for 1.5W?

Yes, my first idea was to build a LM317 driver which can power up to 1.5A but i really didn't want to risk destroying the diode. I'm getting a A-140 so it is capable of 2w which is probably about 2A. I want to power it at about 1.5W with 1.5A. Maybe i should consider the LM317 driver. The idea is that i will have the LM317 driver set to 1.5A and i will have another pot extra which will come out of the box so i can adjust the power to my likings. Thanks for the inspiration again! What ohm resistor should i use for 1.5A?

Thanks
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Old 03-04-2011, 07:34 PM #6
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Default Re: What driver do you recommend for 1.5W?

LM317 Current Calculator - Electric Circuit
or you can get 2 jib drives set at 750-800mA each
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Old 03-04-2011, 07:42 PM #7
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Default Re: What driver do you recommend for 1.5W?

If the diode can hit 2W which will depend on its efficiency it will do so with 1.8A.

I have thought about a labby with a flexdrive sinked running @ Max with this beast. 10,000mAh. Or two in parallel for 20,000mAh.

It is a little wider than a D cell and twice as long as an 18650.
LiFePO4 38120P (M size) Cell: 3.2V 10 Ah, 100A Surge Rate, 32Wh with 6M screw Terminal - UN Approved (3.0)


Or you could go for the gold. 16,000mAh.

LiFePO4 40160S Cell: 3.2V 16 Ah, 160A Surge Rate, 51.2Wh with M3.4 screw Terminal
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Old 03-04-2011, 07:46 PM #8
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Default Re: What driver do you recommend for 1.5W?

If i build my own, the LM317 can go as high as 1.5A. If i just put 1.5A through does that mean i do not need a resitor?

Sorry if this seems like a really stupid question!
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Old 03-04-2011, 08:18 PM #9
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Default Re: What driver do you recommend for 1.5W?

OMG I almost wet my pants just now..... holy battery!

Quote:
Originally Posted by itsmei View Post
If i just put 1.5A through does that mean i do not need a resitor?
You do need a resistor. I tried bypassing the resistor, and it did work for a few
seconds, making the poor litle LM317 push over 1.8Amperes, but it was
scary, overheating and shutting itself down....
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Old 03-07-2011, 05:33 PM #10
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Default Re: What driver do you recommend for 1.5W?

LM317 has a 'Design Load' of 1.5A for the big cases, less for the smaller cases. It is quoted as capable of delivering in excess of 1.5A (with adequate heatsinging),,But that don't mean you are supposed to design for that. if you look at the data sheet, the formula for calculating the resistance in the current source application is Vref/Resistance= Iout. Vref is always 1.25V. Anything less then 0.8 Ohms makes the regulator try to supply OVER 1.5 amps ( so, that's what you need minimum). A short, theoretically, tells the regulator to try to supply infinite current and is real hard on the thermal shutdown circuitry.
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Old 03-07-2011, 05:54 PM #11
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Default Re: What driver do you recommend for 1.5W?

I slightly disagree-

Hop over to digikey and grab:

- A two-18650 battery holder
- 1084 or 1085 Adjustable Positive Voltage regulator
- 2x 10uF ceramic capacitors
- 1N500x diode
- Resistor 2W, 0.81 Ohm (I think that's the closest common value)

(in reality, you may want to order a couple extra of the cheap componants... they're cheap)

Then basically build the normal LM317 DDL circuit, but do it with the 1085, and add an additional capacitor accross the battery outputs (driver input).

Why?

- The 1084 or 1085 are low dropout, so they'll work better for blue diodes, especially as the batteries start to run out of juice. The 1084/1085 needs ~1 to 1.5V, instead of ~2.5V
- You can wire the 1084 or 1085 exactly like an LM317 (pin for pin), don't need to rethink anything.
- The 1084 / 1085 can handle 3 or 5 amps, instead of ~1.5A of the LM317. That's important here, because you're trying to actually run at 1.5 A, which is just about the borderline for an LM317, but well UNDER what either a 1084 or 1085 can handle.
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Old 03-07-2011, 06:12 PM #12
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Default Re: What driver do you recommend for 1.5W?

^ only if in your country can be found Axelite products ..... as example, here in Italy they does not have any distribution, and no shops sells their products, including AX1804 ..... (i know this, cause are some weeks that i'm exchanging emails with their sales office, trying to get some of their boost converters ICs ..... damn crappy Italian distribution system )
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Old 03-07-2011, 06:21 PM #13
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Default Re: What driver do you recommend for 1.5W?

Surely digikey ships to the uk?
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Old 03-11-2011, 02:59 AM #14
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Exclamation Re: What driver do you recommend for 1.5W?

Quote:
Originally Posted by anselm View Post
OMG I almost wet my pants just now..... holy battery!


You do need a resistor. I tried bypassing the resistor, and it did work for a few
seconds, making the poor litle LM317 push over 1.8Amperes, but it was
scary, overheating and shutting itself down....
Yup, RC batteries have deep cycle of about 8000mA/hr @ 7.4v.
They can discharge 80A to 200A through a brushless motor.

I would strongly advise using a Die4driver 445nm version (V1.3) or a Dr.lava flexmod P3
Both of these are EXCELLENT drivers! Die4driver allows real time current monitoring in addition to TTL modulation!
Me.. I am thinking about a making a 445nm lab laser, next project using a 3000mA/hr 7.4v RC cell.
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Old 03-11-2011, 03:50 AM #15
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Default Re: What driver do you recommend for 1.5W?

Farnell is a distributor in the UK and they have the LD1085:

STMICROELECTRONICS|LD1085V|V REG ADJ 1.25/28V, 1085, TO-220 | Farnell United Kingdom

Italia too:
http://it.farnell.com/stmicroelectro...ile/dp/1087152
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Old 03-11-2011, 03:55 AM #16
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Default Re: What driver do you recommend for 1.5W?

For 10 cents more, you could go with the 1084 couldn't you?
STMICROELECTRONICS|LD1084V|V REG ADJ 1.25/28V, 1084, TO-220 | Farnell United Kingdom

Is there any logic to my thinking that at the same current settings, a 1084 will stay cooler than a 1085, given the 1084 can accept a higher upper level of current? (5A instead of 3A)
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SAFETY & IMPORTANT READING (threads authored and contributed to by various members of LPF):
- Federal Aviation Administration - Laser Safety Initiative (link)
- Info release from Laserglow - Default Canadian restrictions on portable lasers (link)
- The Necessity of Safety Goggles (link)

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