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Old 09-28-2011, 04:48 AM #1
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Default New Linear driver! ST-DRIVE

Okay so as some of you know i have been working on a new driver.
This driver i designed had only a few rules.
As many features as possible and no high wattage components.
Well it is done.
There are 2 versions.
1 high powered 2a version and one lower powered 1a version.
The 1a version will fit inside an aixiz module where the other fits behind.
In this post we will be talking about the 2A version.

Feature list!
■ Up to 40 V input voltage
■ Less than 0.5 V voltage overhead
■ Up to 2 A output current
■ PWM dimming pin
■ Shutdown pin
■ LED disconnection diagnostic
■ Slope control with external cap (first batch is lacking this)

So now for some phone pics of the driver!



The driver has good thermal properties.
When driven with 2 3v cells it barley needs heatsinking for long run times.
When driven with 2 3.6v cells it can run for over 2-3min before the chip turns off.
I also have a 12mm round heatsink that is half moon shape that attaches to the driver so when it is slid in behind your diode it presses firmly to the wall and then has a constant duty cycle.



Order info:
The 2 drives for 15$ is for only 10 drivers. once 16 driver has been sold they will no longer sell like this.
Shipping in the USA will be 2$
shipping out side the USA without tracking will be posted shortly.
After 16 units / 8 sets have been sold they will go back to 15$ for 1 or maybe 10$ for 1.
I Set the current before shipment.
Current value.
1970.60
1670.60 (waiting on shipment)
1570.60
1470.59
1000.00
500.00
100.00
so please state the power you want them set at
or you can as for them unset and use your own 805smd resistor


Now the driver has interesting features such as the shut down pin.
When the shutdown pin get zero power the laser turns off.
When used with the correct thermistor you could even build it so when the diode gets past a certain temp the driver is force shut off.
This driver is capable of monitoring not only the drivers temp but also the temp of the laser with this mod.
These are not just used for pointers.
I have them in my scanner using the PWM as TTL, and it works perfectly.
Also the PWM port allows me to use the programed led driver memory chips to give this driver the ability to have modes.


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Last edited by kiyoukan; 10-04-2011 at 05:28 AM.
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Old 09-28-2011, 04:55 AM #2
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Default Re: New Linear driver! ST-DRIVE

Quote:
Originally Posted by kiyoukan View Post
When used with the correct thermistor you could even build it so when the diode gets past a certain temp the driver is force shut off.
This driver is capable of monitoring not only the drivers temp but also the temp of the laser.
No other driver i have seen is even near capable of doing this.
That's a feature I would absolutely love to have... When do you plan to start selling them, and for how much?
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Old 09-28-2011, 05:17 AM #3
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Default Re: New Linear driver! ST-DRIVE

Very soon.
The price will be around 10-15$ a driver max.
But i will have sales going on to get 2 for 15$
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Old 09-28-2011, 12:40 PM #4
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Default Re: New Linear driver! ST-DRIVE

Quote:
Originally Posted by kiyoukan View Post
Very soon.
The price will be around 10-15$ a driver max.
But i will have sales going on to get 2 for 15$
Count me in for at least 2 drivers for that
introductory price....


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Old 09-28-2011, 01:12 PM #5
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Default Re: New Linear driver! ST-DRIVE

These do sound nice!
I'll take two at your introductory price as well.
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Old 09-28-2011, 01:19 PM #6
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Default Re: New Linear driver! ST-DRIVE

I've looked at that IC, and it's very cool! But I never thought there'd be a way to fit that inside an Aixiz - It's like 9.5mm wide isn't it?
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Old 09-28-2011, 01:30 PM #7
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Default Re: New Linear driver! ST-DRIVE

Great job ! How do you set the current ?
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Old 09-28-2011, 01:57 PM #8
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Default Re: New Linear driver! ST-DRIVE

Quote:
Originally Posted by Blord View Post
Great job ! How do you set the current ?
IIRC, that IC has a low voltage (like 200mV) reference voltage that you bridge with a low wattage resistor.
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Old 09-28-2011, 02:05 PM #9
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Default Re: New Linear driver! ST-DRIVE

Yeah - how big is the board? If it's smaller than a 16mm round board, I will take two at your intro price as well!

EDIT: Aww, yeah... these are kind of big. Why didn't you use the STCS1? It's much smaller. Only difference is that it can only go up to 1.5A, which is perfectly fine.

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Old 09-28-2011, 03:35 PM #10
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Default Re: New Linear driver! ST-DRIVE

Very nice driver ! How do you solder the componements ?
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Old 09-28-2011, 05:28 PM #11
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Default Re: New Linear driver! ST-DRIVE

I will take 2 at that awesome price too!
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Old 09-28-2011, 05:31 PM #12
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Default Re: New Linear driver! ST-DRIVE

At that price... can't really go wrong.. count me in please
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Old 09-28-2011, 06:36 PM #13
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Default Re: New Linear driver! ST-DRIVE

I am designing the board for the stcs1a, and im even thinking of putting 2 of them on a single board so that you could have a 3A driver.
The stcs1a will be the smaller board that will fit inside the aixiz module.
The driver in the picture is 11.5mm wide by about 17mm long.
The current is set with a low wattage resistor.

As i am waiting for my digi key order of my solder paste for my reflow oven. (toaster oven with thermal probes)
But for the moment im using my hot air and soldering iron along with a pair of micro tweezers.
Soldering 805smd parts is a pita.

The fact that this driver has a PWM port is cool because it can have modes from those cheap led drivers.
Sorry to say that having modes along with the diode thermal shut off will cost a bit extra.
if you want them pre built.
Or i can sell you a driver with instructions on how to assemble the thermal protection and thermistor, but due to the tiny part size it would only go to those who are good at soldering.

The 5 modes would cost 5$ extra
The Temp shut off would cost another 5$
so even at the most with all these features the driver is a max of 25$
The temp shut off has yet to be decided at what temp.
40c to 55c for the diode thermal shut off.
Now the diode may be able to survive at 60C but its damaging it.
This driver would be perfect for the noob as they would not have to worry about duty cycles.
The second it gets to hot it turns off.
The only problem you might have is over drawing the batteries.
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Old 09-28-2011, 08:26 PM #14
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Default Re: New Linear driver! ST-DRIVE

A 3A driver would be great as an option. I'm interested if they happen to turn up!
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Old 09-28-2011, 11:20 PM #15
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Default Re: New Linear driver! ST-DRIVE

Do you have a pdf of the specs of this driver? Full details please! I am very very interested in your work kiyoukan!
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Old 09-28-2011, 11:48 PM #16
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Default Re: New Linear driver! ST-DRIVE

http://www.st.com/internet/com/TECHN...CD00185795.pdf
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I have lots of lasers.
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I have a projector small only 2.5W
I have other toys. What its plain and simple.
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