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

Bacuse most of surface is covered with copper top layer (it's visible in pictures),drilling holes is too risky. Even sanding it down to 17mm is problematic,but in theory it can be done, dielectric layer is very thin,so risk of short is bigger.

Thanks for the response led4power. Plan bit is then.

any word on new products? new mcpcbs and stuff?

From when can you buy the Luxeon V again without mcpcb ?

New stuff just came today:

16mm 3535 (XP) Cu DTP

20mm 5050 (XM) Cu DTP

20mm triple 3XP Cu DTP

20mm quad 4XP Cu DTP

All Cu DTP boards have 1.5mm thickness,70um copper layer,gold plated top surface,nickel plated bottom surface and pads for 0402 NTC thermistor as temp. sensor.

31.4mm mosX 3x 3535 and 3x 4040 for CUTE-3

31.4mm mosX 4x 3535 and 4x 4040 for CUTE-4

31.4mm mosX 4x 3535 and 4x 4040 for ANGIE

34mm mosX 6x 3535 and 6x 4040 for ANNA

31.4mm mosX boards are compatible to Eagle Eye X6 and fit without PCB drilling and sanding (except small edges from V-cut). Spacer is required of course.

34mm mosX boards are designed for use in Convoy C8 host with 6x or 7x ANNA optics (in case of 7x ANNA central tir is not used). Spacer is required of course.

First fit-test pictures:

I assumed no one would want bare Luxeons after I got PCBs,because I'm the only one who has 4040 DTP boards in stock.

Anyway, just relisted bare Luxeon V again.

I will put some pcbs in my store tomorrow,

prices for Cu DTP boards will be:

16mm (single led) - 1,07€/pc

20mm (single led) - 1,17€/pc

20mm 3XP,4XP - 1,37€/pc

Please contact me over store contact form or here on PM for higher quantity discounts.

Where to get them?

I will have them soon, also whole DIY kits for EE X6 and Convoy C8 with Luxeon V and Samsung 351D and different power levels.

Will the 6x MCPCB fit Convoy BD01, BD06 or other 26650 Flashlight?
Or do you know an 3x 18650 Flashlight for it?

Edit: perhaps:

@Wieselflinkpro

When the 21700 C8F comes out I plan to start a campaign for kiriba-ru to make exactly this spacer

Wow, those are looking good. FYI, the Manta Ray C8.2 also has the same size head as a C8 and will fit the 7 anna. I highly recommend this host, since it’s powered by a 26650 which will improve run times for so much light. I made a custom spacer for a quad here: What did you mod today? - #5538 by vinte77 .

Any update on the ETA for the MZ emitters?
:smiley:

Great

I am looking forward to the driver of 2 bat+.

@Wieselflinkpro

Don't have those lights so I don't know, PCB diameter is 34mm ,thickness is 1.5mm,if that helps.

@contactcr

That's the host I'm waiting for also, 21700 will enable 10000 OTF lumens from 6x Luxeon Vs.

@vinte77

Interesting host, is tailcap switch compatible with Convoy (threads)?

@eas

4 weeks maximum, it's been 8weeks since I ordered them.

@steel_1024

What is 2 bat+?

Hey Neven

Newbie question :smiley:

Can other drivers run with your 34mm mosX mcpcb or it have to run with your driver?

Just like with other mosX boards, you can short MOSFET source and drain pads, and use it as normal MCPCB.

What’s good about mosFET compare to other FET driver?

I think he mean Hosts with 2 or more batteries, like this one, I have already posted: Page Not Found - Aliexpress.com
or this one: What did you mod today? - #5551 by Cereal_killer

I will answer in form of small "glossary":

MOSFET (shot for Metal Oxide Semiconductor Field Effect Transistor) - act as a electronic valve,its resistance (how "open" is) can be controlled with voltage on gate

FET - more general term, there are other types of FETs other than MOSFET, but for drivers MOSFET is only used,so FET is just short term for MOSFET

FET driver - driver that uses FET as control valve, on BLF "FET driver" means DD (Direct Drive) FET driver, which is simple type of driver that uses FET either in fully opened or fully closed state; medium and low modes are accomplished by using PWM (pulse width modulation). In short, good sides are low cost and low generated heat in FET (but that depends a lot on FET and max. current); bad sides are driver doesn't actually regulate anything,it's just like open or closed mechanical switch,so current is not regulated,and low Vf emitters can be fried,LED operates at usually significantly lower efficiency on lower modes,lower modes are not regulated too so brightness depends a lot on battery,resistances etc.

Linear driver - for ex. 7135 IC,LD-A4/B4 also uses FET as control valve, but in a way that valve can be anywhere between "opened" and "closed" state, not just fully opened or closed. Driver adjusts control signal (which controls valve resistance) so that output current remains constant and independent on LED,battery voltage,resistances,temperature etc. Linear drivers can use also PWM to get lower currents (like with 7135), but also can be controlled without any PWM (like LD-A4/B4). Because LEDs have significantly better efficiency(lm/W) at lower currents, driving LEDs with lower constant current is better than driving it with pulses of high current.

For example, any LED will be much more efficient if you drive it with constant 100mA , and not with 2% PWM pulses of 5A (which DD FET drivers do).

That's why there are drivers that use one or more 7135 chips in combination with DD FET to get better efficiency on lower modes. 7135 are still PWMed to get any modes in between 350mA steps.

LD-A4/B4 is linear driver that doesn't use PWM so on any mode current is "real" - no pulses,just a DC current,and LED runs on max. theoretical efficiency. That's equivalent to DD FET with almost infinite number of discrete constant current chips like 7135.

So good sides of linear(non-PWM) drivers are true current regulation (equals to constant brightness and you don't have to worry if LED would survive) and maximized LED efficiency on lower modes; bad sides are increased complexity and heat that's generated in MOSFET. In DD FET driver that heat is "transferred" to LED which causes lower efficiency of LED, so in linear drivers FET acts as sacrificial component that dissipates extra energy from battery.

Problem with heat dissipation in MOSFET is not problem by definition,it is only problematic because FET on linear drivers are on FR4 boards and have relatively poor thermal connection to heatsink (flashlight body). In that case max. power dissipation in MOSFET can be only 1-3Watts which is enough for single cell-single LED,<6A typically, for anything more powerful it's a problem.

So,to get rid of heat at higher powers, one of ideas is to move that MOSFET somewhere else, where it can be better cooled. Simplest place for that is somewhere on LED board because it's well cooled and only one extra (Gate signal) wire is required compared to standard driver connections.

Next problem is that MCPCB with LED+MOSFET must be:

1.Isolated from core - MOSFET drain is usually also thermal pad, and since drain is not connected to GND potential, board must be electrically isolated from core - classical DTP boards are not allowed!

2.Have very high thermal conductivity - this is obvious requirement if LED current/power is high, to reduce LED die temperature and increase efficiency/lumen output

mosX boards are example of solution, they are isolated because they use anodized alumina ceramic as electrical insulator, and at a same time thermal conductivity is very high compared to standard non-DTP boards because alumina is good thermal conductor and it's much thinner than typical non-DTP laminated insulators. Thermal conductivity is not as high as on DTP boards,but it's close enough and mosX is good solution for multiple LED PCBs,where LEDs are usually not driven to its absolute maximum.