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Old 10-18-2010, 02:52 AM #1
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Default 1.5 amp Options

Whats the best way to power a a140 diode to 1.5 amp?

I know some people use multiple drivers or larger drivers but I dont see a consensus on what works best for a handheld.

Im currently debating between a single flexdrive at 1.5A or two flexdrives at 750mA. Any opinions or experience with this?



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Old 10-18-2010, 03:02 PM #2
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Default Re: 1.5 amp Options

Anyone? This is an opinion thread so no wrong answers really.

Im thinking 2 flexdrives running at 750 or even 800mA will be the best because they are each spreading the workload and I would assume this reduces overheating problems. Is my logic sound? Are there better options out there?
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Old 10-18-2010, 03:21 PM #3
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Default Re: 1.5 amp Options

Why don't you just go with one V5 and heatsink it?
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Old 10-18-2010, 04:42 PM #4
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Default Re: 1.5 amp Options

That is what I am going to do. I did more searching and was able to find a thread about parallel drivers (just needed the right search terms haha) which explained that heat was for some reason still I big issue and this for me makes the dual drivers not worth the extra $$.
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Old 10-18-2010, 04:50 PM #5
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Default Re: 1.5 amp Options

If you're only going to drive at 1.5A then you may as well use a single Flexdrive. It's only if you want more grunt than that does two drivers make sense.

Then you can go with either two Flexdrives or two Microboosts. My preference would still be Flexdrives though; they are slightly more efficient; more easily mounted to sink heat and are more suited to the voltage requirements, (although this last one is really not an issue, it could come into play when choosing a power source as the Flexdrive is also a buck driver, meaning you can use an input voltage above the requirement of the LD, whereas the Microboost is a boost only).

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Old 10-18-2010, 04:58 PM #6
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Default Re: 1.5 amp Options

I have a flexdrive on its way. Thanks all
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Old 10-19-2010, 03:18 AM #7
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Default Re: 1.5 amp Options

I did driver for 1.5A myself using TPS61030 chip

The driver:


and my laser with it:
Attached Thumbnails
1.5 amp Options-pa091724-small.jpg   1.5 amp Options-pa091735-small.jpg  
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Old 10-19-2010, 03:28 AM #8
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Default Re: 1.5 amp Options

Wow! nice work on all of it!
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Old 10-19-2010, 03:46 AM #9
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Default Re: 1.5 amp Options

Mad soldering skillz
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Old 10-23-2010, 06:28 AM #10
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Default Re: 1.5 amp Options

Cool one
I think you can get the FlexMod P3. It can push 2A.
Setting him to 1.5 is easy.

I'm now building 1.6W with the FlexDrive V5 and I think if you give him a good heatsink it will be great. I saw a cool heatsink here - 1 gold doller that DTR used and it is COOL
I'm thinking using it also ( I have time until I get all the parts I orded).
Good Luck
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Old 10-23-2010, 05:10 PM #11
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Default Re: 1.5 amp Options

The flexmod can do up to 6A according to Dr. Lava's site. But I have yet to see how using a $40 flexmod is any better than using a $3 lm338 for a pointer application.
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Old 10-23-2010, 05:20 PM #12
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Default Re: 1.5 amp Options

Is that a pre-built driver using the LM388 Cyparagon or building from scratch? Similar to the LM317 circuit? Apologies, I feel I should know that off the top of my head but I don't. Others may find it interesting too for a look at. As the Flexmod is really setup for the display laser world then it could be overkill as half the functionality is not used, (threshold, (does it have these settings?), maximum output, etc).

@ kobi G - Do you know the output is 1.6W at this stage or are you just following a tutorial for a build that ended up at 1.6W? It may not be the same for your laser. 1.5A input cannot be assumed to be 1.6W output just by the figures. It has to be measured and could be a lot lower. Just for information... Good luck though and post some pics when you're done! Tel Aviv... It's a fun city with a lovely beach!

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Old 10-23-2010, 05:31 PM #13
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Default Re: 1.5 amp Options

[QUOTE=Morgan;
@ kobi G - Do you know the output is 1.6W at this stage or are you just following a tutorial for a build that ended up at 1.6W? It may not be the same for your laser. 1.5A input cannot be assumed to be 1.6W output just by the figures. It has to be measured and could be a lot lower. Just for information... Good luck though and post some pics when you're done! Tel Aviv... It's a fun city with a lovely beach!

M
[/QUOTE]


Thanks Morgan,
Yes I'm building it following a tutorial by DTR.
and I'll put pics while building it.

As for the beach.. come over to the city that never stops and I'll show you some lasers I use.

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Old 10-27-2010, 06:10 PM #14
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Default Re: 1.5 amp Options

Quote:
Originally Posted by ArtDen View Post
I did driver for 1.5A myself using TPS61030 chip

The driver:


and my laser with it:

You should provide a tutorial on that driver

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Old 10-27-2010, 07:57 PM #15
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Default Re: 1.5 amp Options

Quote:
Originally Posted by ArtDen View Post
I did driver for 1.5A myself using TPS61030 chip

The driver:


and my laser with it:
I'd like to see some more shots of that laser you built. Do you have your own thread?
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Old 10-28-2010, 09:37 AM #16
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Default Re: 1.5 amp Options

lm338 looks to be a linear regulator - my personal interest is in efficent boost regulators.

LM338 - 5 Amp Adjustable Regulator
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