Led4power.com : LD-4 CC linear drivers, ILC-0/1 illuminated tailcaps, optics, MOSX, copper DTP MCPCBs...

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giorgoskok
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Awesome , thanks !

led4power
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Added couple IR LEDs: new 4715AS-EA (upgraded AS), Luxeon IR 850nm 90deg and 150deg variants, all on 20mm mosX board:

https://led4power.com/product-category/leds/infrared/https://led4power.com/product-category/leds/infrared/

 

 

 

 

 

Enderman
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Hows does the efficiency of the 1S LD-A4 driver compare to a common 7135 driver?

led4power
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LD-A4 doesn't use PWM, so overall light efficiency is higher at lower currents.

On high mode driver efficiency is theoretically the same: Eff=Vled/Vbatt.

Average LD-A4/B4 efficiency (from full to empty battery) is around 85-90% for most LEDs.

 

The_Driver
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Did you ever explain anywhere how it actually works? How do you use a FET to make a linear driver?

BlueSwordM
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Variable linear regulator.

A FET can work as a variable linear regulator.

More expensive, but allows for higher efficiency since it is not using PWM.

My very own high current Beryllium Copper springs Gen 3:
http://budgetlightforum.com/node/67401
Liitokala Aliexpress Stores Battery Fraud: http://budgetlightforum.com/node/60547

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That's probably ~100years (almost) old technology, FET works in linear mode (hence the name linear regulator) as variable resistor (from few MegaOhms to few miliOhms), analog electronics+ uC controls FET so that output current remains constant.

In theory it's simple, in practice not so much if you want wide output current range (from mA to 10-20A),low internal resistance,small size etc.

Agro
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led4power, I so wish I could have Andruil with your driver….

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That would be quite difficult to do, ad the LD A4 and B4 does not support e-switches if I remember well.

My very own high current Beryllium Copper springs Gen 3:
http://budgetlightforum.com/node/67401
Liitokala Aliexpress Stores Battery Fraud: http://budgetlightforum.com/node/60547

led4power
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I will start with driver firmware/hardware upgrade soon, I was too busy with other stuff for quite a bit of time. But since change will not be cosmetic (pretty much complete redesign+e-sw+high power variants), this will take some time.

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I got an impression that it wouldn’t be a quick job as it requires porting software to ATTiny1617 or to Pic16 or finding board space for ATTiny85. But nothing terrible either, especially that there’s good change someone would provide porting assistance.
Other than this I don’t think it would be hard. But then – I know very little about how it’s really done, so I may be very wrong.

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led4power wrote:

I will start with driver firmware/hardware upgrade soon, I was too busy with other stuff for quite a bit of time. But since change will not be cosmetic (pretty much complete redesign+e-sw+high power variants), this will take some time.

That’s fantastic news! I am already excited thinking about a new Sofirn C8F with LD4 driver, triple XP-E2 red and side switch. Smile

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Agro wrote:
I got an impression that it wouldn't be a quick job as it requires porting software to ATTiny1617 or to Pic16 or finding board space for ATTiny85. But nothing terrible either, especially that there's good change someone would provide porting assistance. Other than this I don't think it would be hard. But then - I know very little about how it's really done, so I may be very wrong.

I already use PIC16 on LD-x4 and always write my own firmware, so that's not problem, only problem currently is lack of time.

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I was referring to how awesome it would be to run Andruil with your driver…and to be able to customize it to fit my needs perfectly.
Open source makes your hardware more valuable.

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@led4power: I plan to mod an Astrolux S41 with Quad XP-E2 red (overcurrent up to 2.5A per LED if they sustain it). Do you think the LD4A driver would work in that flashlight. I’m not sure if the power dissipation might be too high for it. If it works, can you give me some recommendations what I should consider in terms of configurations, please? Thank you!

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XP-E2?  This test shows maximum at  only 2A.

At 10Amps total LD-B4 is better option (in combination with mosled 4xp board) because its much larger heat dissipation capability.

 

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Agro wrote:
I was referring to how awesome it would be to run Andruil with your driver…and to be able to customize it to fit my needs perfectly.
Open source makes your hardware more valuable.

It is fair enough that, having designed them from scratch and trying to make a small business out of his unique designs, l4p decided to not share his driver designs and just sell the drivers as is.
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Looking at prices of other BLF drivers, I don't think someone can make and sell them for 10€ anyway. And in that price firmware development is included.

Much simpler FET+7135 costs about that,  LD-x4 has much more expensive 4-layer PCB and 2x more components which are all very small, 0402 mostly.

I'm already hearing "what about China?", they even can't make BLF A6 work properly, plus LD-x4 is calibrated via precision external volt. reference, and tested before shipping, so I doubt even China can make it for 10€, definitely not in <1000pcs quantity.

 

Agro
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djozz wrote:
Agro wrote:
I was referring to how awesome it would be to run Andruil with your driver…and to be able to customize it to fit my needs perfectly.
Open source makes your hardware more valuable.

It is fair enough that, having designed them from scratch and trying to make a small business out of his unique designs, l4p decided to not share his driver designs and just sell the drivers as is.

I never said it was wrong. And never asked to open source his work (though that would be awesome). I just pointed out that IMO leveraging open source work of the community would make the LDx drivers better.
djozz
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It did sound like some sort of request to make his work open source and that made me respond to it Smile

I agree that open source developments are very much fun for hardcore modders, who want ultimate control of every single aspect of their flashlight. But for the type of modders that want or need a little bit more work taken out of their hands, led4power makes awesome quality components available.

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led4power wrote:

XP-E2? Are you sure? This test shows maximum at  only 2A. Also that LED is quite old and has low lumen output.


At 10Amps total LD-B4 is better option (in combination with mosled 4xp board) because its much larger heat dissipation capability.


 

Thank you! You are right, 2.100mA seems to be better than 2.500mA. Is there any better red LED compared to the XP-E2? I could not find anything else so far.

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After quite some years already since it came out, I have not found a better red led than the XP-E2.

The red Nichia 219B has similar performance both in current and output (I never posted my test results for it), and there is a red chinese XM-size led recently on aliexpress (also tested it without posting the results), that one can handle more current (over 3A) and has a bit more output than the red XP-E2 but at the cost of a considerably bigger die (so worse performance in an optic). And there is no triple board with the XM footprint as far as I know.

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Thank you djozz! Would you mind sharing your results with me/us about the red Chinese XM-size LED? Do you have a specific link to the LED on Aliexpress? Maybe I could put this one into a single emitter light.

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FlashTom wrote:
Thank you djozz! Would you mind sharing your results with me/us about the red Chinese XM-size LED? Do you have a specific link to the LED on Aliexpress? Maybe I could put this one into a single emitter light.

Will do. I wanted to make a nice post with graphs at some point but never got round to it. I may get you the bare numbers for the time being…
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djozz wrote:
FlashTom wrote:
Thank you djozz! Would you mind sharing your results with me/us about the red Chinese XM-size LED? Do you have a specific link to the LED on Aliexpress? Maybe I could put this one into a single emitter light.

Will do. I wanted to make a nice post with graphs at some point but never got round to it. I may get you the bare numbers for the time being…

That sounds great to me djozz! I would greatly appreciate it, if you were to send me the raw data you got. Thanks a lot in advance! I would like to try out this Chinese XM-L footprint size LED in some hosts (e.g. 12x in a Skyray King or a single Convoy M1 emitter).

Anyway, I don’t want to hijack Led4Power’s thread any longer for those red LEDs. Sorry for getting a bit offtopic here. Innocent

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FlashTom wrote:
djozz wrote:
FlashTom wrote:
Thank you djozz! Would you mind sharing your results with me/us about the red Chinese XM-size LED? Do you have a specific link to the LED on Aliexpress? Maybe I could put this one into a single emitter light.

Will do. I wanted to make a nice post with graphs at some point but never got round to it. I may get you the bare numbers for the time being…

That sounds great to me djozz! I would greatly appreciate it, if you were to send me the raw data you got. Thanks a lot in advance! I would like to try out this Chinese XM-L footprint size LED in some hosts (e.g. 12x in a Skyray King or a single Convoy M1 emitter).

Anyway, I don’t want to hijack Led4Power’s thread any longer for those red LEDs. Sorry for getting a bit offtopic here. Innocent


One more hijack post: here’s the link, btw the pink ones are lots of fun, they are blue leds partly phosfor converted to red and I get almost 1000 lumen out of them Party (also never posted the test)

https://www.aliexpress.com/item/5PCS-5050-Epileds-XML-XM-L-T6-LED-10W-High-Power-LED-Red-Green-Blue-UV/32840392031.html?spm=2114.search0104.3.2.4f0f2b33cWCQQl&ws_ab_test=searchweb0_0,searchweb201602_5_5722916_10152_10151_10065_10344_10068_5722816_10342_10343_10340_10341_5722616_10696_10084_10083_10618_10304_10307_10820_10301_10821_5722716_10843_10059_306_100031_10103_10624_5722516_10623_10622_10621_10620,searchweb201603_35,ppcSwitch_5&algo_expid=14025a10-ec8d-4ac0-a369-d5d4fc311198-0&algo_pvid=14025a10-ec8d-4ac0-a369-d5d4fc311198&priceBeautifyAB=0

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@FlashTom, I posted the Epileds 5050 red led results here: http://budgetlightforum.com/node/61127

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I just found it. Thank you so much! Thumbs Up

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@ led4power:

I’m afraid the LD4B would not technically fit into the Astrolux S41. Do you think 4 XP-E2 would work fine with the LD4A in terms of power dissipation? There is no alternative MCPCB for the S41, so I have to stick with the integrated board. I plan to use the LD4A with 9 amps, i.e. 2.25amps per XP-E2. As the sweet spot seems to be around 2.4amps there should not be any problem to drive the LED to 2.25amps. Or I could use the 6amps setting which means 1.5amps per XP-E2.

What do you think?

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I don't see where did you find sweet spot of red XP-E2 to be 2.4A? That's past the point of max. lumen,and way over point of sweet spot. Red and yellow LEDs hate heat, lumen drop is much more significant compared to white LEDs at elevated temps.

I think 1.5A per LED is fine, but since Vf is only ~2.5V, worst power dissipation in driver would be ~(4-2.5)*4.5=6.75Watts, LD-A4 can handle that heat if thermal contact is very good, you need to make something similar to this in your light:

https://led4power.com/product/ld-a4-thermal-enhancement-kit-convoy-s2/

 

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