[MOD] Astrolux MF02 NarsilM XHP 70.2 280kcd @8A 14V

18 posts / 0 new
Last post
Lexel
Lexel's picture
Offline
Last seen: 7 hours 5 min ago
Joined: 11/01/2016 - 08:00
Posts: 3678
Location: Germany
[MOD] Astrolux MF02 NarsilM XHP 70.2 280kcd @8A 14V

Modded today a MF02 with XHP70.2 P2 5700K

just after the mod I realized that was a bundled LED to send someone with a driver while in that light should get a shaved XHP50.2 J4-1A Facepalm

still results show 282kcd at 8A 12V LED configuration, so over 100W feed to the LED

25mm DTP MCPCB

12V cut and solder points

added 12V mod bridge

Reflow time, of cours the bridge will unsolder again

Compared to old MCPCB and centering ring

first fit in the light, not as good as original PCB but it fits
I used the Dremel fron driver side to remove some material of the MCPCM and hole to get the thich wires through

Driver flashing, calibrating and testing

Soldering the leads, but the centering ring does not fit

using a Dremel to remove some material of the washers and solder spots to get the centering ring fit flat on the MCPCB

pinkpanda3310
pinkpanda3310's picture
Offline
Last seen: 4 hours 49 min ago
Joined: 12/28/2013 - 08:45
Posts: 1363
Location: Perth

Nearly 300kcd from an xhp70 Shocked

Well done Thumbs Up

EasyB
Offline
Last seen: 1 hour 52 min ago
Joined: 03/09/2016 - 15:24
Posts: 1297
Location: Ohio

Nice result! Good to see these powerful buck drivers being developed. 8A has got to be close to “direct drive” so it wouldn’t stay in relation long, right?

Lexel
Lexel's picture
Offline
Last seen: 7 hours 5 min ago
Joined: 11/01/2016 - 08:00
Posts: 3678
Location: Germany
EasyB wrote:
Nice result! Good to see these powerful buck drivers being developed. 8A has got to be close to “direct drive” so it wouldn’t stay in relation long, right?

Yeah the driver changes to DD when the voltage drops
The resistance of the coil and FET in this case is pretty low with 27.4mOhms
As well as 28mOhms for the sense resistor

So at 8A the voltage drop of buck parts is only 0.44V which is good for 4S

The main advantage of the this regulator chip is the low dropout voltage of the boost part

EasyB
Offline
Last seen: 1 hour 52 min ago
Joined: 03/09/2016 - 15:24
Posts: 1297
Location: Ohio

I would love to see what a good slice dedomed would do. Should see at least a 50% increase in lux.

Myers
Offline
Last seen: 5 hours 55 min ago
Joined: 04/05/2014 - 17:03
Posts: 36

Can you take beamshots? Original XHP35, this 70.2 mod, and sliced 70.2? Big Smile

EasyB
Offline
Last seen: 1 hour 52 min ago
Joined: 03/09/2016 - 15:24
Posts: 1297
Location: Ohio

So I’m not up on you guys’ latest work on buck drivers. How much power can you send with a 4s setup? And what is the efficiency of the above driver?

giorgoskok
giorgoskok's picture
Offline
Last seen: 14 hours 59 min ago
Joined: 11/13/2015 - 10:46
Posts: 2554
Location: Greece

Nice mod lexel !

I would be interested to see a rutime graph , 2s2p with dd driver VS 4s with this buck driver .

Lexel
Lexel's picture
Offline
Last seen: 7 hours 5 min ago
Joined: 11/01/2016 - 08:00
Posts: 3678
Location: Germany

The 4S goes into DD if needed
losses in all conductors are reduced

if we would say a DD light has 50mOhms total resistance 16A 12.5W loss
added Buck parts resistance to 100mOhms 6.4W losses when it gets in DD

I have no unmodded XHP35 to compare right now but working to get one

EasyB
Offline
Last seen: 1 hour 52 min ago
Joined: 03/09/2016 - 15:24
Posts: 1297
Location: Ohio

What about when it is switching to reduce the output voltage? Say I have a 4s battery with a 9V emitter. What is the max current that could be sent to the emitter before burning up the driver components?

Lexel
Lexel's picture
Offline
Last seen: 7 hours 5 min ago
Joined: 11/01/2016 - 08:00
Posts: 3678
Location: Germany

8A is the max current I would go, basically the power loss on the driver should stay at about 4W

9V Emitter has the advantage to be in full regulation till the cells hit LVP

EasyB
Offline
Last seen: 1 hour 52 min ago
Joined: 03/09/2016 - 15:24
Posts: 1297
Location: Ohio

What about 3s battery with 6V XHP70.2. What is the max current it could send to the emitter? Could it do 12A? Sorry if that is a dumb question but I’m not as familiar with buck drivers.

MRsDNF
MRsDNF's picture
Offline
Last seen: 1 hour 2 min ago
Joined: 12/22/2011 - 21:18
Posts: 11910
Location: A light beam away from the missus in the land of Aus.

Very creative Lexel. Love your work. Thumbs Up

My current and or voltage measurements are only relevent to anything that I measure.

Budget light hobby proudly sponsored by my Mastercard and unknowingly paid for by a hard working wife. 

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

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.

 

Lexel
Lexel's picture
Offline
Last seen: 7 hours 5 min ago
Joined: 11/01/2016 - 08:00
Posts: 3678
Location: Germany
EasyB wrote:
What about 3s battery with 6V XHP70.2. What is the max current it could send to the emitter? Could it do 12A? Sorry if that is a dumb question but I’m not as familiar with buck drivers.

8A is pretty much the limit, above that current the power loss on the shunt gets an issue, as well as the FET at
The Buck chip uses a special method to detect the current that is differential measuring the inductor ripple as well

I could get the shunt reduced as well as limit the 0-1.24V PWM input value, this needs also a new ramping table on the moon modes
On the other hand I would have to reduce the inductor value as well to get the ripple increased
Also slowing Buck frequency even more to get less switching loss on the MOSFET, for that I have to order bigger lower voltage capacitors

ramptosd
Offline
Last seen: 1 hour 21 min ago
Joined: 03/13/2017 - 18:32
Posts: 88
Location: United States

Lexel, do you know how many lumens you get with this 70.2 mod?

Lexel
Lexel's picture
Offline
Last seen: 7 hours 5 min ago
Joined: 11/01/2016 - 08:00
Posts: 3678
Location: Germany

The LED is at its max lumens so likely close to 9000 LED lumens that got tested by other members, lets say 12-15% losses in optics

Redlyne22
Redlyne22's picture
Offline
Last seen: 34 min 58 sec ago
Joined: 12/25/2017 - 07:02
Posts: 12
Location: United States
Anybody jave beam shoots by anychane? BtW, lexel, track8ng says the driver just hit new york. Few more days until i get it.maybe I’ll be the one posting the beam shots.

Some times being a newbie is the best.
M.O.B. I mean C, cause it's money over chickens.

Lexel
Lexel's picture
Offline
Last seen: 7 hours 5 min ago
Joined: 11/01/2016 - 08:00
Posts: 3678
Location: Germany

Ill do a wallshot when I have time

Working on some new things