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

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led4power
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I never had problems with pads coming off pcb, it seems you are using way too high soldering temperature, do you have any pictures of your soldering work?

You can solder wire to those resistor pads, but be careful, if you are holding soldering tip for too long or temperature is too high, you could easily desolder/remove resistor since it's very small.

Which mosX board and which 6V LED are you using? "M" pad is connected to LED cathode. There should be no continuity between + and M, maybe you've soldered LED rotated by 90deg? You should check LED and MCPCB first, of course driver can't work if LED pads are shorted.

In third picture is Luxeon MZ (3V LED) driven by LD-B4 driver (not LD-B4HV which is >1S driver), LD-B4 has moonlight support so M wire is for moonlight modes.

 

 

Buoyen
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Thanks for quick reply! Smile

My soldering is probably the cause Smile
I’m using a regular 25-30W soldering iron without temperature control. Heating the wire/pad until the solder is melted and then let go.

I might have soldered the LED wrong also, but if M is connected to LED cathode there should be continuity between “+” and “m” on the mosx when measure through the LED? Like in the photo:

https://photos.app.goo.gl/7zJkgkEzvu6Ewvh58

Don’t know if this is usual, but the LED lights up when I use my voltmeter on continuity setting so I know the LED is working at least. Just like in the picture when I measure between + and m.

And at first I did connect battery and all and discovered I wasn’t able to adjust brightness or enter setup mode. The LED was running direct drive I guess. Luckily the battery wasn’t full and I jused just thin wires to test with. It was bright Big Smile Big Smile

The LEDs are a XHP70.2 6V on the mosX connected in series with a XHP50.2 6V on separate pcb. Driven by 4 samsung 18650 batteries in series. The driver is the 4s/6A version.

The curcuit seems to be fine when the gate wire is not connected between driver and mosx. When this wire is connected it seems like the FET is shorted or connected somehow, like this:
https://photos.app.goo.gl/y7t1gmPpkZ4z7LgE9

led4power
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 Try to measure exact resistance (instead of continuity) between + and M pads, with LED should still see high resistance. Best way to set LED is to set multimeter to diode test, if LED is ok it will emit some light, but that usually only works for 3V LEDs.

Since you are running 2 LEDs on separate PCBs, how did you connect those PCBs? Diagram for one LED looks ok.

Buoyen
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Ok, thanks again!
Will see when I get home.

Btw when I say continuity I mean diode test. Sorry Smile

Added the other pcb/LED to my scheme Smile

https://photos.app.goo.gl/gMhamVpvTYJU51z77

This other LED did come on sinkpad pcb. It’s only the XHP70 og mosX i did myself.

Buoyen
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Measured resistanse between + and M. Even at 20M it is out of range.

Tried new driver. Soldered gate very carefully Smile went ok.

Same result though when I have my meter on diode test and measure between + and – on mosx the LED lights up as if the FET is on.

Adding some pictures. Is it possible the LED itself sit wrong on the pcb allthough I cant measure any shorts?

The driver
https://photos.app.goo.gl/zD7FrEAZbGh84Y5cA
https://photos.app.goo.gl/6T5JUNVrtyFr6aAr8

MosX
https://photos.app.goo.gl/K6AEKF3prcprw3Qb7

From led4power website to see how the pads look
https://photos.app.goo.gl/RKm4gKoJFVk25Sef8

XHP 70 datasheet shows what is anode and cathode
https://photos.app.goo.gl/x7qc3BpDYKGLPtYa8

Buoyen
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I followed this video on how to flow the LED onto the mosx. Only difference was that I did it in the kitchen using an old frying pan (don’t use it for cooking anymore Wink ).

Used low temperature solder paste. I don’t think the solder on the fet melted while I did it.

https://youtu.be/B3F68ubfBkk

djozz
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So your FET is in series with two leds? Does it get the right voltage to function?

Buoyen
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Yes it is. Input voltage on the driver is 16V. Two series LEDs in series.

Maybe I should switch them around so the mosx is closest to ground?

But this was my next question: do I need to hook up the battery for the FET to function? I thought it was normally open curcuit. A bit scared to power on after yesterday when I think it was direct drive..

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Buoyen wrote:
Ok, thanks again! Will see when I get home. Btw when I say continuity I mean diode test. Sorry Smile Added the other pcb/LED to my scheme Smile https://photos.app.goo.gl/gMhamVpvTYJU51z77 This other LED did come on sinkpad pcb. It's only the XHP70 og mosX i did myself.

 

mosX board should be last in chain from battery + to gnd (or closest to gnd), so if you connect it like in diagram it's not good.

Buoyen
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Cool. I’ll try Big Smile

led4power
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Buoyen wrote:
Yes it is. Input voltage on the driver is 16V. Two series LEDs in series. Maybe I should switch them around so the mosx is closest to ground? But this was my next question: do I need to hook up the battery for the FET to function? I thought it was normally open curcuit. A bit scared to power on after yesterday when I think it was direct drive..

FET is normally open (high resistance) but if gate pin is free floating it can be charged for example via testing with mulitmeter and FET will be in closed (low Ohm) state for quite a few seconds even without any voltage applied to gate becasue of gate capacitance.

Actually this is the way I test mosX boards with FET: I charge gate by applying x.xV for 1-2sec, and then I connect mosX board with LED to power supply to + and - pads like standard (non mosX ) MCPCBs.

Buoyen
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Worked like a charm! Excellent, thank you. Smile Smile

contactcr
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Some test fitting while I wait on LEDs

New LD-B4 12A 20MM. The pads are huge on this and easy to solder. Looking forward to finishing this build..

Finished product:

LEDs: 6x LH351D 3500K 90CRI

12A CC mode
~11.55A tail – 3,205lm

FET mode (VTC5D)
~19.4A tail – 4,370lm

contactcr
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Was there never a MOSLED Extreme 4*XP*? Only the black board one was made?

led4power
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Yes, no 4xp mosX in 20mm size.

contactcr
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led4power wrote:

Yes, no 4xp mosX in 20mm size.

The black mosled should be ok with M2 quad at 12A right? Sitting on big chunk of copper

led4power
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Which LEDs?

contactcr
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351D or SST-20 probably

led4power
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At 3Amps per LED they are within rated manufacturer current which means they would be ok even on ultra cheap standard dielectric MCPCBs, so black mosled 4x is more than fine.

 

Buoyen
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My new helmet light.

Ldb4 hv 6A driving 1 xhp70.2 and 1 xhp50.2 in series off a 4S battery. CNC milled housing in aluminium for good thermal properties. 3d printed gopro mount. And remote control of course. Looking forward to try it on the trails Big Smile

 

Next step is anodizing and paint.

 

https://photos.app.goo.gl/iitiGKdBAruXCwbD8

https://photos.app.goo.gl/sNYXwPNi9yMg6Vkm8

https://photos.app.goo.gl/MjQkugScJjMPFXzb8

https://photos.app.goo.gl/km6Etn64wY469faA9

https://photos.app.goo.gl/bPFP5v5H3x48W7if8

https://photos.app.goo.gl/YtoXnkFL3t3JSvMf9

 

 

contactcr
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Damn that is fancy. Nice work

Buoyen
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Thanks Wink

KevinZA1988
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Neven, is your website down for maintenance? I’m struggling to get it loaded.

Astrolux MF01 Mini, BLF Q8, BLF A6, BLF FW3A, BLF FW3C, Convoy L6, Convoy C8+ , Convoy S3, Convoy M21A, Convoy S11, Emisar D4, Fireflies E07, Jaxman E2L, Lumintop EDC18, Manta Ray C8.2 long version, Olight S1R Baton II special edition series, S2R Baton II, Nitecore HC65, Olight H1R Nova.

https://photos.app.goo.gl/JaJaDv4V838AEJf39

led4power
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Hosting provider issues, I hope they will fix that today.

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Thumbs Up

Astrolux MF01 Mini, BLF Q8, BLF A6, BLF FW3A, BLF FW3C, Convoy L6, Convoy C8+ , Convoy S3, Convoy M21A, Convoy S11, Emisar D4, Fireflies E07, Jaxman E2L, Lumintop EDC18, Manta Ray C8.2 long version, Olight S1R Baton II special edition series, S2R Baton II, Nitecore HC65, Olight H1R Nova.

https://photos.app.goo.gl/JaJaDv4V838AEJf39

led4power
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It should work now.

KevinZA1988
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Thanks it’s working…

Astrolux MF01 Mini, BLF Q8, BLF A6, BLF FW3A, BLF FW3C, Convoy L6, Convoy C8+ , Convoy S3, Convoy M21A, Convoy S11, Emisar D4, Fireflies E07, Jaxman E2L, Lumintop EDC18, Manta Ray C8.2 long version, Olight S1R Baton II special edition series, S2R Baton II, Nitecore HC65, Olight H1R Nova.

https://photos.app.goo.gl/JaJaDv4V838AEJf39

flightless22
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The server is up but the store is not accessible.

led4power
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It's back now, but until some updates are done I'm not sure how long it will work (again), so if you plan to order, it's good to do it now.

led4power
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After some updates web is working stable now.

Luxeon MZ (on all PCBs), Osram IR and Luxeon IR  are on clearance sale:

https://led4power.com/product-category/leds1/lumiledsluxeon/luxeon-mz-4x2mm2-die/

https://led4power.com/?s=4715as+osram&post_type=product

 

 

 

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