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

Only way is to manually change stock qty of all items to 0.

As I learn about drivers sometimes there’s a thing that surprises me.
This happened with LD4 recently.
5mΩ resistance is quite low considering that you probably need to sense current somehow.
I wonder if you do this with a really low value resistor or use some other sensing technique or sidestep this in an entirely different way.
I know that the exact construction of LD4 is a trade secret and I don’t ask you to reveal any special sauce but if this actual thing is not something special it would be great to read it.

5mOhm driver resistance is accomplished by using 1mOhm sense resistor (nothing special about it), FET adds about 3-3.5mOhm, traces 0.5-1mOhm. LD-2/3/4 design comes from era when XM-L2 and XP-G2 were most popular LEDs, and they both have very high Vf, so driver with lower resistance allowed higher output on max. mode. But there is always trade-off, in this case lower resolution on low currents.

These days basically all good emitters have quite low Vf and there is no need for such low parasitic/internal resistance (that's why my next drivers will have 10mOhm sense resistor for 5Amp driver).

I see, thanks for the explanation. :slight_smile:

Neven, some time ago I installed one of yours 9A driver on a 14500 flashlight, powering 3x XP-G2 Leds.

It worked fine until some weeks ago, and I just wanted to perceive what may have happened.
What happens now is that it only works with 2 modes, like Moonlight and Turbo, no matter how many times I click, I can’t enter the programming mode.

Could it be some component that “burned” or got damaged, and that originated this inability to have more modes or enter the programming?

BTW, the host is a Jaxman E3 and I am using a forward clicky switch.

Thanks in advance!

PM sent.

Thanks Neven, PM replied! :+1:

Triple in Jax E3? How did you do that?

Yup! :slight_smile:

I would say with lots of time and effort, but I did it this way :
What did you mod today? - #7136 by MascaratumB :wink:

What happened to the website? I cannot access led4power.com anymore since some time (weeks, I’d say). The problem might be on my side, but don’t know how to fix it.

Post #1315:

Mentioned even on this page! Overlooked it :person_facepalming:

Thanks!

How long do you plan to keep it closed?
Constantly closing stores to avoid paying taxes is a very bad attitude towards customers :confused:

"To avoid paying taxes" statement is not true, I'm paying taxes either way, but I can't explain my local bureaucracy and laws in one sentence. Store will be closed probably for another two weeks until new generation of DTP PCBs arrive.

Looking forward to the reopening. Best of luck to you and your business!

Looking forward to the store resuming operations, I have 2 hosts in need of emitters and drivers.

And some nice dedicated Osram emitter series drivers?

I'm working on new driver generation, but it will take some time.

With the LD-x4, when DD mode is enabled in the menu, does DD replace the constant current high mode? Like if I have a 6A driver and am using with a low Vf LED so DD is say 12A, does enabling DD mode mean I don’t have a 6A mode?

Yes it’s one or the other.

I think weird things would happen if you allow both so I see the point but a shortcut like 2 or 3 clicks for DD might be nice for next gen.

Since it’s possible for DD to be the same as CC high due to battery and LED combo it could have 2 identical modes in a row if it worked that way i guess.