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Old 12-30-2011, 09:57 AM #17
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Default Re: NCP1529 Driver For RED LASER DIODES - What do you think?

Quote:
Originally Posted by foulmist View Post
Can I get one for testing then?
It isn't a problem, if you promise to write review in this thread. Send me your address in PM.



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Old 12-30-2011, 10:03 AM #18
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Default Re: NCP1529 Driver For RED LASER DIODES - What do you think?

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Originally Posted by HTV View Post
Constant voltage makes driver more efficient and permit increase temperature stability of LDs . But, constant voltage canít be used for all types LDs. For example, it canít be used for BR or Blue LDs.
You're going to have to explain that one, because I'm not sold.

1) Why would constant voltage be more efficient than constant current.

2) Why would it be any safer to run a RED or IR with constant voltage than a BR?

In fact, now is a great time for this:
Constant Current vs. Constant Voltage in use with Laser Diodes - YouTube
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Old 12-30-2011, 10:09 AM #19
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Default Re: NCP1529 Driver For RED LASER DIODES - What do you think?

Quote:
Originally Posted by rhd View Post
You're going to have to explain that one, because I'm not sold.

1) Why would constant voltage be more efficient than constant current.

2) Why would it be any safer to run a RED or IR with constant voltage than a BR?

In fact, now is a great time for this:
Constant Current vs. Constant Voltage in use with Laser Diodes - YouTube
rhd thanks for the video I would have included it myself.

I am for constant current all the way in. When constant voltage is used current will change (increase more likely) with temperatures. If the driver or diode exceeds a certain temp the current will rise keeping the voltage the same and thus will kill the diode.

I must agree though that efficiency might be better with a constant voltage. I have managed to suck 1A out of LM3410 in constant voltage mode. But in constant current I could only get about 700mA tops. I am talking about the same output voltage here.
EDIT: I guess that's why Dr.Lava wired his IC on the flex drive as constant voltage output and then regulate the current with the INA regulator.

BUT constant current is what laser diodes need.

It's been tested many times. If I receive a free sample of the driver I will confirm this (unless the driver is really special and doesn't do that)

Last edited by foulmist; 12-30-2011 at 10:44 AM.
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Old 12-30-2011, 10:53 PM #20
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Default Re: NCP1529 Driver For RED LASER DIODES - What do you think?

Hi laserpointerforums.com

Me from that russian site too.
Nice to meet you.
Quote:
Originally Posted by foulmist View Post
I am for constant current all the way in. When constant voltage is used current will change (increase more likely) with temperatures. If the driver or diode exceeds a certain temp the current will rise keeping the voltage the same and thus will kill the diode.
The fact is, that different diodes have different volt ampere characteristic and thermal stability. The most linear are red 660nm, so the constant voltage driver might be perfect. But 405nm and 445nm diodes are not linear and certainly require constant current drivers.
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Old 12-30-2011, 11:08 PM #21
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Default Re: NCP1529 Driver For RED LASER DIODES - What do you think?

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Originally Posted by docTV View Post
The fact is, that different diodes have different volt ampere characteristic and thermal stability. The most linear are red 660nm, so the constant voltage driver might be perfect. But 405nm and 445nm diodes are not linear and certainly require constant current drivers.
I think the concern relates less to whether the relationship is linear, and more to whether the Vf curve itself is steep or relatively flat. A flat Vf curve will give you less security re: current, when you're regulating voltage.

Voltage reg is just the wrong way to go. I'll take diode safety over an extra 10% of driver efficiency ANY day.
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Old 12-31-2011, 08:10 PM #22
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Default Re: NCP1529 Driver For RED LASER DIODES - What do you think?

What I want to know is

A. Does it have a max current limit that is safe for red diodes (I assume we are talking about lpc-815/826)?

B. How do you set the current? You can't use a test load because it's constant voltage, so do you just set it with your multimeter in current mode in series with the diode? This won't work well either simply because of the way the meter measures current it drops some voltage. It may not drop much voltage, but it will drop enough to change the current once you hook it straight up to the diode.

@foulmist

What input and output voltages were you using with the lm3410?
I could get 1.2A with a load a bit over 5v in constant current.
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Old 12-31-2011, 09:22 PM #23
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Default Re: NCP1529 Driver For RED LASER DIODES - What do you think?

It seems very strange to me that they would go to the trouble of adding THREE additional ICs simply for the battery monitor *frosting*, yet not bother to make this a proper current regulating driver with the addition of just ONE further IC.
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Old 01-01-2012, 05:26 PM #24
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Default Re: NCP1529 Driver For RED LASER DIODES - What do you think?

Quote:
Originally Posted by benmwv View Post
What input and output voltages were you using with the lm3410?
I could get 1.2A with a load a bit over 5v in constant current.
I always use 3.6V/3.7V as input voltage as this is the Li-Ion battery nominal operating voltage.

Btw Happy New Year to all!

-Tom
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Old 01-03-2012, 02:39 AM #25
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Default Re: NCP1529 Driver For RED LASER DIODES - What do you think?

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Very interesting, i did not know LED's and LD's have a Negative Temperature Coefficient!
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Old 01-04-2012, 08:34 PM #26
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Default Re: NCP1529 Driver For RED LASER DIODES - What do you think?

Quote:
Originally Posted by rhd View Post
1) Why would constant voltage be more efficient than constant current.
Red LDs have rather stable current-voltage characteristic that allow to supply its with voltage. Also, red LDs consume lower current under undercooling. It means that risk of LDís death becomes lower, because its efficiently and radiated power increase under frost. Though, this is not considerable changes. But, we still have the main advantage of supplying with voltage: absence of current sensor that dissipates the power; stable work of stabilizer that was created for voltage stability; we can use soft start; etc.

We use this driver more than 3 years. Practice shows that Red LDs like this type of supply. Also, IR LDs 780nm like too.


Quote:
2) Why would it be any safer to run a RED or IR with constant voltage than a BR?
BR LDs have high temperature instability of current-voltage characteristic. Current will change high, so high that LD will become into sell-heating and die. Therefore, BR LDs need supply with current. We can use a little back-coupling with voltage for thermal stabilization of BR LDsí radiated power. These principles were implemented in our driver for BR LDs. Its name is Indigo. In this time, converterís effectiveness is higher at the expense of voltage dip considerable decreases at current setting resistor; we can use soft start; etc.

Quote:
In fact, now is a great time for this
A main sense of this video is decreasing voltage with increasing temperature of LED. It isnít a problem for red LD in pointers. We use constant current driver for supply Red LDs in projectors. But, this is another story.
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Old 01-04-2012, 09:00 PM #27
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Default Re: NCP1529 Driver For RED LASER DIODES - What do you think?

Quote:
Originally Posted by benmwv View Post
A. Does it have a max current limit that is safe for red diodes (I assume we are talking about lpc-815/826)?
No, it doesn’t. But, we make measurements of popular LDs and recommends current and voltage for them. For example, we recommend 2.95V for 815 and 2.73V for 826. It means that LDs will work 100 hours in laser pointer.

Quote:
B. How do you set the current?
We use current-voltage characteristic for it.

Quote:
You can't use a test load because it's constant voltage
By the way, we can. There is a possibility to set a current in Inferno.

Last edited by HTV; 01-04-2012 at 09:37 PM.
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Old 01-04-2012, 09:09 PM #28
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Default Re: NCP1529 Driver For RED LASER DIODES - What do you think?

Quote:
Originally Posted by rhd View Post
It seems very strange to me that they would go to the trouble of adding THREE additional ICs simply for the battery monitor *frosting*, yet not bother to make this a proper current regulating driver with the addition of just ONE further IC.
Itís simple. There isn't necessary in constant current driver for red LDs. But, there was a necessary in protection of Li-Po.
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Old 01-04-2012, 09:13 PM #29
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Default Re: NCP1529 Driver For RED LASER DIODES - What do you think?

Quote:
Originally Posted by foulmist View Post
I always use 3.6V/3.7V as input voltage as this is the Li-Ion battery nominal operating voltage.
Li-Po has voltage range from 4.2V to 2.8V during a supply.

Last edited by HTV; 01-04-2012 at 09:14 PM.
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Old 01-09-2012, 10:03 PM #30
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Default Re: NCP1529 Driver For RED LASER DIODES - What do you think?

Today I received the Inferno drive from HTV ) and it's time for the review which I promised. click here
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