[Sale] Buck drivers 20, 21, 22, 24, 30mm L6, MF01, MF02/04(S), TN40S/42, BLF GT, Acebeam X45/65

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BlueSwordM
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Oh OK then. Thank you again Lexel.

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Leon
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Hello, I’m interested too.

vestureofblood
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Lexel wrote:
40€ are just the parts for 30A
development and labor add up at least another 40€
on CFT-90 LED 3.7V 40A possible

400W is possible going to 5S battery carrier would add enough voltage overhead for 30A @13.5V XHP-70.s maybe the MF03 becomes a 400W Buck if they choose me to do it
sounds odd but only add about 5.5mm Carrier diameter to fit a 5. cell

I don’t think that price sounds unreasonable for a driver like that. I would be interested in a driver for 5s, 6s, 8s. Higher voltage is fine for the projects I have in mind. Some of the light builds I am considering are as high as 14s.

I have added a link to to this thread in my new BLFGT video as well. If I had know about this driver before I would have included it as an option in the video.

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Lexel
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vestureofblood wrote:
Lexel wrote:
40€ are just the parts for 30A
development and labor add up at least another 40€
on CFT-90 LED 3.7V 40A possible

400W is possible going to 5S battery carrier would add enough voltage overhead for 30A @13.5V XHP-70.s maybe the MF03 becomes a 400W Buck if they choose me to do it
sounds odd but only add about 5.5mm Carrier diameter to fit a 5. cell

I don’t think that price sounds unreasonable for a driver like that. I would be interested in a driver for 5s, 6s, 8s. Higher voltage is fine for the projects I have in mind. Some of the light builds I am considering are as high as 14s.

I have added a link to to this thread in my new BLFGT video as well. If I had know about this driver before I would have included it as an option in the video.

Powerful buck for 36V COB is planned with up to 12S and 5-6A output, above we have to consider how to get proper input MLCCs not cheap in 100V,
also LDOs in more than 60V and fast enough MOSFET above 50(60V rated) is an issue
Nothing speaks against Endermans quad buck driver design I made with just 2-4 circuits equipped, if mounted flsat to a heatsink as it is designed

Lexel
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So I found today a very odd problem with the LM3409 Buck driver

Its related to the voltage regulator, it seems in this case 10 Ohms resistor was to big get the LDO in a stable regulation,
it had a voltage drop over C1 from 16 to 10.5V, which is very bad, the resistor should decouple battery and LDO input voltage from spikes,
but the battery side looked pretty clean while the LDO side had every 20ms a big drop from the LDO probably resetting

output voltage had about 1.4V ripple on about 70% of the ramping very low working fine, then at a level it started
resulting in an unstable max. current as the current control voltage was not stable at 5V

Replacing the LDO and trying to solve probably capacitor issues replacing them as well did not help

I lowered R1 from 10 to 4.7Ohms this cleared all ripple on the LDOs input and output side

I recommend if you can solder SMD to do this on all drivers add a 10 Ohms resistor above R1

Mark M
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I am interested in a MF02 driver with battery boards and springs, my stock driver failed. Sad

m1llie
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Interested in one of the next-gen super high current buck drivers (like the CFT-90 driver for the BLF GT). Intended application is driving 7 ~6v Nichia 144 LEDs in parallel, from either 4s or 2s2p (which would work best?) in an SRK style light. If there’s a driver in this series that fits the bill, please put me down for it.

scr79423
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would a XHP35 HI D4 1A from kaidomain give higher lm/cd then D4 NW?

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scr79423 wrote:
would a XHP35 HI D4 1A from kaidomain give higher lm/cd then D4 NW?

It’s hard to say. The D4 bin has a tolerance of plus or minus 7%. Assuming you had two that put out the same lumens at the same amperage, you’d need a lux meter that read the different color temps the same. Most of the inexpensive lux meters seem to be more sensitive to CW.

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Using a single E Switch are the connections to S and G pads?

 

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JasonWW
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MRsDNF wrote:
Using a single E Switch are the connections to S and G pads?

Yes.

In this pic for instance

The G pad is connected to ground.

The S pad is connected to leg 2 of the MCU.

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MRsDNF
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Thanks Jason. The Lexel driver I have works like a charm.

 

djozz quotes, "it came with chinese lettering that is chinese to me".

                      "My man mousehole needs one too"

old4570 said "I'm not an expert , so don't suffer from any such technical restrictions".

Old-Lumens. Highly admired and cherished member of Budget Light Forum. 11.5.2011 - 20.12.16. RIP.

 

Mark M
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Just finished modding my MF02 with Lexel’s driver and it is awesome! Better output than my stock driver and of course Narsil UI. Thanks Lexel!
.

scr79423
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what driver gives more output for the MF02S? TA driver or Lexel driver?

JasonWW
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scr79423 wrote:
what driver gives more output for the MF02S? TA driver or Lexel driver?

If they are both FET, they should be the same. It’s more about what battery gives the most power.

Does Lexel make a buck driver for the MF02S? I’m not sure.

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Mark M
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I thought Level was using the same buck driver for both the MF02 and MF02S?

JasonWW
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Mark M wrote:
I thought Lexel was using the same buck driver for both the MF02 and MF02S?

If we are comparing a Buck driver to a FET driver, the FET is always more powerful. It delivers as much power as the batteries can give and slowly tapers off as battery voltage starts to go down.

The buck driver starts off at a lower amperage and power level but maintains steady output until the voltage gets too low to stay in regulation and then it starts to either taper off or step down to a lower power level.

Honestly, Lexel makes so many drivers they are hard to keep track of. Once he see this question I’m sure he’ll go into more detail.

I know Texas_Ace prefers the FET driver to run xhp70.2, but Lexel prefers to run it on his buck driver.

According to the info I can find on Lexels threads, his buck driver can do 7.5A@12v (you convert the battery carrier from 6v to 12v).

A FET driver can pull from 9 to 11 amps at 12v depending on the emitter, etc…

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Mark M
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Nevermind it seems his new driver is FET driven.

JasonWW
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Mark M wrote:
Nevermind it seems his new driver is FET driven.

I think he offers both.

I added to my post above.

Texas Ace Lumen Tube and JoshK Sphere calibrated with Maukka lights

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Mark M
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Poor guy must stay really busy

Lexel
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MRsDNF wrote:
Using a single E Switch are the connections to S and G pads?

on my Buck drivers I went right from the beginning on all with
G Ground
S Switch
L for indicator LED
later LS was added as permenent LED
Mark M wrote:
Poor guy must stay really busy

yes I am too busy to keep track and got no notification that this topic was updated

The new MF02S buck driver has only about 0.2V more voltage drop over a DD driver, but it is limited to 8A from the voltage sense resistors
on the middle currents it gets of course more efficient

anyways 6A is sort of the highest current I would do to a XHP70.2 having very high output
and not going to the limit of the LED where you gain very little brightness with tons of heat

MF02S (originally MF02 XHP70.2 mod) driver is out now a few months
basically there had do be made a few improvements and parts change to get it more efficient
as well get some ringing problem on the LDO fixed that occured on higher currents

MOSFET was changed to a far better one
less voltage drop 5.5 vs. the old 12.8mOhms,
It has 1/4 of the switching losses as it switches faster
I could go up in switching frequency a lot which was reduced on the first XHP70.2 mods
total loss compared to old 1/3

Inductor value cut to half now 2.2uH with new FET and resistance as well (XHP35 has 10uH, old XHP70.2 4.7uH)
Output and Input caps sustained to handle the more current

scr79423
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Lexel wrote:
MRsDNF wrote:
Using a single E Switch are the connections to S and G pads?

on my Buck drivers I went right from the beginning on all with
G Ground
S Switch
L for indicator LED
later LS was added as permenent LED
Mark M wrote:
Poor guy must stay really busy

yes I am too busy to keep track and got no notification that this topic was updated

The new MF02S buck driver has only about 0.25V more voltage drop over a DD driver, but it is limited to 8A from the voltage sense resistors

anyways 6A is sort of the highest current I would do to a XHP70.2 having very high output
and not going to the limit of the LED where you gain very little brightness with tons of heat

MF02S (originally MF02 XHP70.2 mod) driver is out now a few months
basically there had do be made a few improvements and parts change to get it more efficient
as well get some ringing problem on the LDO fixed that occured on higher currents

MOSFET was changed to a far better one
less voltage drop 5.5 vs. the old 12.8mOhms,
It has 1/4 of the switching losses as it switches faster
I could go up in switching frequency a lot which was reduced on the first XHP70.2 mods
total loss compared to old 1/3

Inductor value cut to half now 2.2uH with new FET and resistance as well (XHP35 has 10uH, old XHP70.2 4.7uH)
Output and Input caps sustained to handle the more current

If i sent you a MF02S, could you install the new lexel buck driver for me?

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Lexel wrote:
MRsDNF wrote:
Using a single E Switch are the connections to S and G pads?

on my Buck drivers I went right from the beginning on all with
G Ground
S Switch
L for indicator LED
later LS was added as permenent LED
Mark M wrote:
Poor guy must stay really busy

yes I am too busy to keep track and got no notification that this topic was updated

The new MF02S buck driver has only about 0.2V more voltage drop over a DD driver, but it is limited to 8A from the voltage sense resistors
on the middle currents it gets of course more efficient

anyways 6A is sort of the highest current I would do to a XHP70.2 having very high output
and not going to the limit of the LED where you gain very little brightness with tons of heat

MF02S (originally MF02 XHP70.2 mod) driver is out now a few months
basically there had do be made a few improvements and parts change to get it more efficient
as well get some ringing problem on the LDO fixed that occured on higher currents

MOSFET was changed to a far better one
less voltage drop 5.5 vs. the old 12.8mOhms,
It has 1/4 of the switching losses as it switches faster
I could go up in switching frequency a lot which was reduced on the first XHP70.2 mods
total loss compared to old 1/3

Inductor value cut to half now 2.2uH with new FET and resistance as well (XHP35 has 10uH, old XHP70.2 4.7uH)
Output and Input caps sustained to handle the more current


Can you measure the efficiency of the driver in some sensible setting?
Lexel
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Agro wrote:
Can you measure the efficiency of the driver in some sensible setting?

Let me give it a try as I modded today for someone else a MF02S

I am bad at making videos but I post it anyways


actually the PSU voltage meter uses calvin clamps so its reding on contact points on driver to compensate losses on the wires, even if they are 2.5mm²

Measurements

Turbo (measure 3 times and used average later as in video the clamp meter was not prcise)
Input: 15,15V 5.4-5,44A
Output: 13,44-13,51V 5,70-5,74A
Efficiency: 94,4%

I also changed the calibration resistor to get to 6.09A later and did again 2 measurements
15,11V 5,8A
13,6V 6,09A
94,5%

fully charged VTC6 should give this voltage
16,17 5,37A
13,55V 6,04A
94,25%

2A
Input: 15,73V 1,766A
Output: 12,06V 2,12A
Efficiency: 95,5%

500mA switching frequency is over 1 Mhz as outout voltage low and input high
Input: 15,94V 415mA
Output: 11,2V 502mA
Efficiency: 85%

Agro
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Thanks!

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I would like to mod my L6 with a new type Osram KW CSLNM1.TG LED.
In this LED the thermal pad is electrically neutral, this means there is no need for LED PCB/driver GND isolation.
Max suggested current is 5.75A (Vf~3,40V)

Will it work with this buck driver?

Lexel
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Sure 2S 3V buck driver with desired current possible

Lexel
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I did some testing today

with the usual 12V XHP70.2 driver setup I can drop the input voltage on the driver down to 13.6V before we drop output below 6A to the LED

Mmdecp
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Where can I buy driver for my astrolux mf02 ?

Mmdecp
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Please where can I buy a driver for my astrolux mf02 .link pleaseee?

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