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

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Chatika vas Paus
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led4power wrote:
Spacer is required of course.

Where to get them?

led4power
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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.

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

Edit: perhaps:
- https://de.aliexpress.com/item/UF-T80-CREE-XHP50-2500lm-Stepless-Adjusted-USB-Rechargeable-LED-Flashlight-3×18650/32581169523.html

contactcr
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@Wieselflinkpro

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

vinte77
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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: http://budgetlightforum.com/comment/1354143#comment-1354143 .

eas
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Any update on the ETA for the MZ emitters? Big Smile

.

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Great

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

Sorry for my poor english.

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@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+?

 

 

 

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Hey Neven

Newbie question Big Smile

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

Nico -.-

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

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

Nico -.-

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led4power wrote:

@steel_1024


What is 2 bat+?


I think he mean Hosts with 2 or more batteries, like this one, I have already posted: https://de.aliexpress.com/item/UF-T80-CREE-XHP50-2500lm-Stepless-Adjusted-USB-Rechargeable-LED-Flashlight-3%C3%9718650/32581169523.html
or this one: http://budgetlightforum.com/comment/1354434#comment-1354434
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Nicolicous wrote:
What's good about mosFET compare to other FET driver?

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.

nitroz
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I love these LEDs but will you be doing any of these on a 10mm boards?

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I don't think there is enough interest in 10mm boards,and setup fees are high.

But if you're going to use 10mm pcbs,that means you will use it in small light (AAA/AA), and if that's the case, Luxeon V on 0.8mm FR4 board (OSH park etc.) with thermal vias would work just fine,no need for DTP.

 

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If it was for small light i would bet you can just force it onto 3535 board but some people put 10mm pcb on copper disc to make custom multi emitter pcb

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contactcr wrote:
If it was for small light i would bet you can just force it onto 3535 board but some people put 10mm pcb on copper disc to make custom multi emitter pcb

This and other things.

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There is not enough of those "some people" to make it affordable. One option is to sand down 16mm pcb.

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Hello.
Isn’t possible to buy the LD-B4 but without the CPU?
I’m thinking about modding one of my FL, but I would like to use my own MCU (because of other stuffs) so I just need to “convert” PWM to analogue FET drive.
If I got it right, this is what the SOT-23-5 IC on your driver do.
Or if isn’t possible to buy just these ICs (because I would like also my own PCB with the MCU because of the space so I would use only the IC anyway).

Thank you Smile

Sorry for my English Sealed

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Benik3 wrote:
Hello.
Isn’t possible to buy the LD-B4 but without the CPU?
I’m thinking about modding one of my FL, but I would like to use my own MCU (because of other stuffs) so I just need to “convert” PWM to analogue FET drive.
If I got it right, this is what the SOT-23-5 IC on your driver do.
Or if isn’t possible to buy just these ICs (because I would like also my own PCB with the MCU because of the space so I would use only the IC anyway).

Thank you Smile


So, you want BOTH a driver without MCU AND a MCU without driver?

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led4power wrote:

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

No the tailcap on the Manta Ray is not compatible with Convoy threads, since the it’s sized for 26650 batteries. It’s only the bezels that are interchangeable. The MR is pretty hefty and has a lot of meat on it to help with heat sinking as well. When I was drilling the center hole on the shelf I was pleasantly surprised at how long it took me to drill through, the shelf is very thick. I’m a big fan of the host.

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Benik3 wrote:
Hello. Isn't possible to buy the LD-B4 but without the CPU? I'm thinking about modding one of my FL, but I would like to use my own MCU (because of other stuffs) so I just need to "convert" PWM to analogue FET drive. If I got it right, this is what the SOT-23-5 IC on your driver do. Or if isn't possible to buy just these ICs (because I would like also my own PCB with the MCU because of the space so I would use only the IC anyway). Thank you :)

In theory it's possible,you need PWM signal from your CPU/MCU, driver will provide constant current,but everything else (modes,LVP,OTP protections,UI...) must be done by your MCU.

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vinte77 wrote:
No the tailcap on the Manta Ray is not compatible with Convoy threads, since the it's sized for 26650 batteries. It's only the bezels that are interchangeable. The MR is pretty hefty and has a lot of meat on it to help with heat sinking as well. When I was drilling the center hole on the shelf I was pleasantly surprised at how long it took me to drill through, the shelf is very thick. I'm a big fan of the host.

 

I meant switch PCB size and switch hole threads, could you check?

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You have some nice products there led4power, will be ordering some soon.

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Ordered Silly

 

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Added new copper DTP boards:

https://led4power.com/product-category/mcpcbs/copper-dtp/

 

Price for 16mm DTP pcbs:

1pc - 1,07€

50pcs - 0.95€

100pcs - 0.8€

Price for 20mm DTP pcbs:

1pc - 1,17€

50pcs - 1.0€

100pcs - 0.9€

Price for 20mm 3XP and 4XP DTP pcbs:

1pc - 1,37€

50pcs - 1,2€

100pcs - 1.1€

 

If you want to buy 50+pcs, please contact me so I can give you coupon code, currently page doesn't automatically calculate discount.

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DavidEF wrote:
So, you want BOTH a driver without MCU AND a MCU without driver?

Nope, you got it wrong. I want the driver without MCU (PIC). The IC is the SOT-23-5 chip which “convert” PWM to linear drive.

led4power wrote:

In theory it’s possible,you need PWM signal from your CPU/MCU, driver will provide constant current,but everything else (modes,LVP,OTP protections,UI…) must be done by your MCU.

Yes, that’s exactly what I want Smile

Sorry for my English Sealed

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led4power wrote:

I meant switch PCB size and switch hole threads, could you check?

Ok, I will check tonight after work.

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Benik3 wrote:
DavidEF wrote:
So, you want BOTH a driver without MCU AND a MCU without driver?

Nope, you got it wrong. I want the driver without MCU (PIC). The IC is the SOT-23-5 chip which “convert” PWM to linear drive.

led4power wrote:

In theory it’s possible,you need PWM signal from your CPU/MCU, driver will provide constant current,but everything else (modes,LVP,OTP protections,UI…) must be done by your MCU.

Yes, that’s exactly what I want Smile


Yep, I definitely read it wrong. Facepalm

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vinte77 wrote:
led4power wrote:

I meant switch PCB size and switch hole threads, could you check?

Ok, I will check tonight after work.

 

Did you maybe check it? I just bought one MR C8.2 host,looks interesting enough for extreme power.

What is currently the best 26650 cell for high discharge (25-40A)?

 

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