IS: Info/Announcements: Quad and Triple XP Series 20mm Copper Direct Thermal Boards (7/3)

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djozz
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The third configuration lets 2 strings of 2 leds in series run on two li-ions, using a common lineair driver. But because the driver MCU can not run on 2xli-ions in series (max for Attiny is 5.5V if i remember well), the voltage for running the MCU is picked up in between the two leds, that will be about half of the battery voltage. A bit unusual set-up, but it should work I guess.

CalvinIS
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Sorry, here is the relevant information I got from Alexey.

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leaftye
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The picture above of the 2P2S doesn't make sense to me.  Why isn't there anything touching the inner pads?  4S I don't understand at all.  I'd probably always run it as 4P, and at least that makes sense to me.

 

Here's an album with 4 pictures.  I tried to exaggerate the shading to show the traces. Actually, most of the board is trace.  It's the cuts, the low areas, that are important.  You can also see how the center pads are lifted up.

 

The low mode should be lower.

ohaya
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leaftye wrote:

The picture above of the 2P2S doesn’t make sense to me.  Why isn’t there anything touching the inner pads?  4S I don’t understand at all.  I’d probably always run it as 4P, and at least that makes sense to me.

 

Here’s an album with 4 pictures.  I tried to exaggerate the shading to show the traces. Actually, most of the board is trace.  It’s the cuts, the low areas, that are important.  You can also see how the center pads are lifted up.

 

Hi,

Which part of “4S” don’t you understand (sorry – couldn’t help that :)…)?

Is it that you don’t understand why anyone would want to power the 4 emitters in series?

Or, that you don’t understand how that wiring configuration works?

If it’s the former, then I guess that you’d want that if you had a 4xLi-ion battery configuration (4S batteries), or if you had a boost driver that could support ~12V.

Jim

CalvinIS
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leaftye wrote:

The picture above of the 2P2S doesn't make sense to me.  Why isn't there anything touching the inner pads?  4S I don't understand at all.  I'd probably always run it as 4P, and at least that makes sense to me.

Picture above the 2P2S? The blank board?

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leaftye
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It's the configuration.  Both left pads are connected to each other, both middle pads are connected to each other, and both right pads are connected to each other.  If I drew some diagrams I might possibly figure it out, but looking at it I can't see how it's possible to go 4S with those paired connections.

The low mode should be lower.

Werner
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You have to think of the position of the emitters…

ohaya
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Come to think of it, how ARE the emitter pads arranged on this board (since there aren’t any +/- symbols)?

Also, does that small star-shaped exposed area/pad have any purpose?

leaftye
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Oh wait, I can see 4S if the traces are cut. 

 

CalvinIS wrote:

leaftye wrote:

The picture above of the 2P2S doesn't make sense to me.  Why isn't there anything touching the inner pads?  4S I don't understand at all.  I'd probably always run it as 4P, and at least that makes sense to me.

Picture above the 2P2S? The blank board?

The one just below blank board and directly to the right of "2P2S =>".  I see an open connection.  Nothing would light.

 

ohaya wrote:
Come to think of it, how ARE the emitter pads arranged on this board (since there aren't any +/- symbols)? Also, does that small star-shaped exposed area/pad have any purpose?

It's which ever way you want.  For parallel it could be - on the outside and + on the inside, or the other way around.

 

I think the star's proximity to the pad for the lead is supposed to be an approximation of the crescent and star.

The low mode should be lower.

Werner
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Why does IS only have the10624 and not the 10623…?

CalvinIS
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Werner wrote:
Why does IS only have the10624 and not the 10623...?

I'm working on overhauling the Carclo listings and inventory. If I recall correctly, we stopped carrying 10623 because it took 2 years to sell a tray.

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Werner
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Lol I just looked at the specifications and the 10623 seemed better maybe I have overseen something…

10623

10624

10621 looks even better on the specs but it is not frosted and I have read somewhere that this can cause ugly beam patterns or so but on the example picture it looks very nice

If I compare the xpg2 values the 10623 seems to be a bit more efficient and has a tighter angle than the 10624, but if I compare the example pictures for the XPG1 the 10624 seems to have a smaller hotspot….?

I hope anyone has ordered one of each and makes a real world comparison…

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Well, some explanation about Quad needed as I see )

There are three possible option (without cutting)

I declare square pad as central and crescent ones as side. All others small signs (star, F in hexagon, batman) just decor.

A: Parallel. For parallel connection you must connect both side pads together, like this:

This type connection may be used with 1xLiIon and buck or linear driver. There are all pads (central and side) used

We must deliver about 3.5V volt in this config, and current from driver divided by 4; this type connection ideal for 1×18650 EDC

B: (2P)x2S. Here we have two pair of diodes: each pair parallel and these pairs serial connected. There are only side pads used. We need boost driver with 1xLiFePo4 or buck with 2xLiIon. We must deliver about 7V to our board in this configuration and current from driver divided by 2.

C: Tricky linear. Well, here we need to isolate battery (+) from driver and wire it directly to board; then, after some voltage drop, we deliver it to Linear regulator (because no matter there linear works: it regulate current for the whole scheme). This configuration for 2xLiIon and current divided by 2 too.

Hope it help

leaftye
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Now I understand how 2P2S is done.  It was a good graphic, but I was paying too much attention to the wires coming out of the middle hole to see what was happening.  If the wires came in from the outside like this, it would have been plain as day.

 

 

I was just being dumb.  Thank you for bearing with me and providing all those explanations.  

The low mode should be lower.

ohaya
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Question about the parallel configuration again:

So is that with the positive (red) lead going to both crescents, and the negative (black) lead going to the 3-bar-shaped pad?

EDIT: Answering my own question: It appears that one of the pads for each emitter on a given side is connected to the crescent shaped pad on that side, and the 3-bar-shaped pad is connected to the “other” pad for each emitter, so what I said above appears to be correct.

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