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Old 12-16-2009, 01:18 AM #1
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Default 2.3V @ 1.3A Case Positive Driver?

They shouldn't let speech teachers build lasers

The subject line is the need. I need to drive a case positive 2.3V diode @ 1.3A.

Can someone build a driver that can do this that is small enough to fit into a hand held unit (MXDL 3405)?

Peace,
dave


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Old 12-16-2009, 01:26 AM #2
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Default Re: 2.3V @ 1.3A Case Positive Driver?

Quote:
Originally Posted by daguin View Post
They shouldn't let speech teachers build lasers

The subject line is the need. I need to drive a case positive 2.3V diode @ 1.3A.

Can someone build a driver that can do this that is small enough to fit into a hand held unit (MXDL 3405)?

Peace,
dave
Man, I so wish I could do this to help give back for all you help us out around here. Unfortunately I'm ignorant. Perhaps Jerry can?
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Old 12-16-2009, 01:35 AM #3
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Default Re: 2.3V @ 1.3A Case Positive Driver?

AMC7135. Link coming soon.

http://www.dealextreme.com/details.dx/sku.1885

You trying to drive an IR diode right? each AMC7135 gives you 350mA output, so you'd need like 3 or 4 depending if you want to over or under drive it.
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Old 12-16-2009, 01:50 AM #4
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Default Re: 2.3V @ 1.3A Case Positive Driver?

Quote:
Originally Posted by bryce007 View Post
AMC7135. Link coming soon.

DealExtreme: $16.58 AMC7135 1050mA Regulated Circuit Board for DIY Flashlights 10-Pack

You trying to drive an IR diode right? each AMC7135 gives you 350mA output, so you'd need like 3 or 4 depending if you want to over or under drive it.

It's a 9mm 635nm diode. I'm finally getting a chance to look at it

Peace,
dave
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Old 12-16-2009, 01:55 AM #5
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Default Re: 2.3V @ 1.3A Case Positive Driver?

AMC7135's also come in 1400mA versions. And would most likely be under spec by a little...

So it would be the right power. But I'm just not sure if it would put out the 2.3 volts or not.
http://www.dealextreme.com/details.dx/sku.1886


I'm sure Igor could build the driver you need...
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Old 12-16-2009, 02:04 AM #6
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Default Re: 2.3V @ 1.3A Case Positive Driver?

Quote:
Originally Posted by daguin View Post
It's a 9mm 635nm diode. I'm finally getting a chance to look at it

Peace,
dave
Dave,

Is it the SDL-7501?
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Old 12-16-2009, 02:21 AM #7
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Default Re: 2.3V @ 1.3A Case Positive Driver?

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Dave,

Is it the SDL-7501?
No. It's a 2W, 9mm open can diode. I won't be driving it to 2W. If I can get 500mW out of it, I will be ecstatic.

Peace,
dave
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Old 12-16-2009, 02:26 AM #8
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Default Re: 2.3V @ 1.3A Case Positive Driver?

Quote:
Originally Posted by daguin View Post
No. It's a 2W, 9mm open can diode. I won't be driving it to 2W. If I can get 500mW out of it, I will be ecstatic.

Peace,
dave
WOW!

Where (if I may ask) did you get it from?

Ray
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Old 12-16-2009, 02:29 AM #9
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Default Re: 2.3V @ 1.3A Case Positive Driver?

Dave I actually have a few 1050mA AMC7135 drivers on hand if you don't want to wait for DX shipping. Each board has three chips, with each chip driving 350mA. You could swap a chip from one board to the other to get 1400mA if needed. The board is normally around 17mm in diameter but I have sanded one down to 14mm (if needed). Let me know if you want to work something out.
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Old 12-16-2009, 02:49 AM #10
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Default Re: 2.3V @ 1.3A Case Positive Driver?

Hey Dave, I just remembered that Gazoo used to use the AMC7135/350mA drivers to power red LOC's...

So that means that they will put out the voltage you need.

I'll bet the 1400mA AMC7135 will work for you...
http://www.dealextreme.com/details.dx/sku.1886
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Last edited by jayrob; 12-16-2009 at 03:45 AM.
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Old 12-16-2009, 05:44 AM #11
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Default Re: 2.3V @ 1.3A Case Positive Driver?

Quote:
Originally Posted by Raybo View Post
WOW!
Where (if I may ask) did you get it from?
Ray
I got it from Milos, who got it from Chris.

Peace,
dave
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Old 12-16-2009, 06:28 AM #12
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Default Re: 2.3V @ 1.3A Case Positive Driver?

I got this information from Bill , he sent it to me in a pm , i hope he doesnt mind me posting it. I had asked him how he drives his multiwatt handheld IR diode builds:


The 2W 808nm handhelds use 1 x 18650 power, diode is a snoctony 2W c-mount that requires 2.8A, so I used 2 x 1400mA DX flashlight regulator disks as my current regulator. IR laser diodes have a low Vf, so only one lithium battery is needed.

The 1W handhelds require 1400mA, so I used 1 x 18650 and a single DX 1400mA regulator disk. I have also used a DDL type driver in these based on an LM337 negative regulator.

In my 4W 960nm, power is 2 x 25500, regulator is 3 x 1400mA DX disk + 1 x 350mA DX disk. This laser is being rebuilt to use a regulator based on LM338. May also try one based on LM358 and mosfet.

The 4W 808nm uses 2 x 25500 and 2 x LM338 regulators, diode requires 6.4A.



I hope it helps.
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Old 12-16-2009, 10:00 AM #13
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Question Re: 2.3V @ 1.3A Case Positive Driver?

Uhm, i don't have a MDXL host for check, sorry ..... can you say me what exactly is the space that you have (lenght and diameter), and if you need a pcb unit or something that can also be "dipped" in thermal silicone inside your host ? (cause that level of current can produce a lot of heat, and a not good heatsinked driver can fry easily)

And, ofcourse, what is the power source ? ..... single li-ion, or two cells ?

BTW, fixed or a little bit adjustable ? (cannot be adjusted too much, anyway, with that current)
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Old 12-16-2009, 11:33 AM #14
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Default Re: 2.3V @ 1.3A Case Positive Driver?


The new stuff!! Constant Current Source #1
these can be up to 20A (or higher with other transistor), dropout 0.6V
someone (I can't remember name) here used this schematic with an 2W c-mount in kryton host, powered by 1x 18650
btw, how much costed your diode?
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Old 12-16-2009, 12:49 PM #15
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Default Re: 2.3V @ 1.3A Case Positive Driver?

Quote:
Originally Posted by HIMNL9 View Post
Uhm, i don't have a MDXL host for check, sorry ..... can you say me what exactly is the space that you have (lenght and diameter), and if you need a pcb unit or something that can also be "dipped" in thermal silicone inside your host ? (cause that level of current can produce a lot of heat, and a not good heatsinked driver can fry easily)

And, ofcourse, what is the power source ? ..... single li-ion, or two cells ?

BTW, fixed or a little bit adjustable ? (cannot be adjusted too much, anyway, with that current)
The space for a driver in this host is relatively large. It is a "stepped" cylinder. The upper portion of the cylinder is 27mm dia. X 10mm Deep. The lower portion of the cylinder is 16.5mm dia. X 15mm deep. Any "dip" would be limited to the lower portion of the cylinder as the upper portion must be able to turn to screw on and/or off

The host has a three AAA-sized battery carriage. By utilizing dummy batteries and switching from rechargeable AAA's, to primary AAA's, to 10440's a wide variety of power levels can be had. So it can have roughly 1.2V - 12V with the voltage variable as batteries are added, taken away, or switched as to type. I will use whichever voltage is needed. The available voltages then are:

1.2V, 1.5V, 2.4V, 3V, 3.6V, 4V. 4.5V, 8V, 12V

The battery compartment is 22mm dia X 55mm deep. I could adapt a single larger li-on battery that is shorter than 56mm.

For what I am doing here, fixed would be fine. The diode is supposedly rated to 2W with active cooling. The host has passive cooling so I am not going anywhere close to rated output.

Peace,
dave
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Old 12-16-2009, 01:32 PM #16
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Default Re: 2.3V @ 1.3A Case Positive Driver?

Uhm, at the moment i have nothing as switching / boost at home, that can reach this current, but if for you is enough also a linear, can arrange a paralleled unit with 3 x LM1117 (same producion lot) in SOT223, decoupled with 0,1 ohm resistors at the inputs, with a 0,96 ohm (or better said, a combination with that value) as current sensor resistor ..... the 3 IC can hold 800mA each, so for the current must be enough (can also be enough 2, but are close to the limit, and i always prefer stay abundant)

the LM1117 have a declared dropout of 1.2V, so you need at least 3.5V, but is better use at least 4V ..... a 3,7V LI-ION may be enough, but when it discharge and go under 3.5, it become too low ..... a 4,5V supply can be good, just a bit more dissipation, but using AAA batteries, are you sure that they can give you 1.3A ?

As alternative, i'm waiting some samples from on-semi, that they claim can be used for make switching boost/buck converters until 1,5A, but i don't know how much time they take for arrive here, and then i also need to do some experiments on them, before build something useful (is a new product, and i never got them before, so until i don't have them in my hands for test, i know nothing about them, except that what they printed on the datasheets), so no ideas at all, about the time that this may take .....
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