Mike cz
Newly Enlightened
A large problem was the power 6xSSC P7. I did not want to connect SSC P7 directly to the 2x18650. After a long search, I found this switching power supply: LSM2 T30 W12 DC-DC switch!
http://www.murata-ps.com/data/power/lsm2-t30-d12.pdf
Technical parameters DC-DC switch are amazing:
Iout = 30A (set to ~15A) (Uout = 0,8-3,6 V) total 125W!
Uout = 0.8-5V
Uin = 5-15V
Size 33x13,5mm
Efficiency 94%!
Price € 25
-the OFF-mode (electronically) flows into switch regulator 0.9 mA (at uin = 8.4 V), but this is still very much ..
-it is a voltage buck regulator, which is totally unsuitable for LED. It must reckon with the fact, that when the LED heat up, current to the LED is larger. This can be easily solved with PTC thermistor ...
-so strong boost converter is not, and if yes, it was very expensive.
DC-DC switch LSM2 T30 W12 is very small!!!
I cleaned the thread Romisen, because the current of 2x18650 is 7-8A.
I made for DC-DC switch auxiliary PCB with a special spring. On the PCB is soldered 40x10uF capacitors Taiyo Yuden with 50miliohm ESR for DC-DC switch.
Added 3-mode switch. Each mode is arbitrarily set by trimmer.
Comparison with the original (15W) DC-DC switch
Cooler for P7 with thread, this is not original.
Drilling 1,5mm holes with thread gave me a lot of work. SSC P7 are soldered to Cu washer. It was difficult, because the whole washer must be warmed up
220 °C. On the picture is also seen PTC thermistor for temperature compensation.
This is a komplete flashlight.
Technical parameters:
Mid: 20W (efficiency 105 lm/W*20=2100lm!)*
Low: 5W (efficiency 120 lm/W*5=600lm!)*
High 50W (current over 15A)*
On high 50W is between 4300-4800 lm
*These mode's is not PWM
With 2xPanasonic 2900mAh:
Mid: 1hour
Low: 4hours
High: 20min
Theoretically SSC P7 DSVMI has 2,8A/3,25V(testing) and 800-900lm => 88-99 lm/W!
The 6xSSC P7 DSVMI => 6*2,8A*3,25V=> 54,6W*88lm/W=> min 4800lm (max 5400lm)!!!
I could set even more power: 60-70W or more :naughty: - over 55OO lm, but then is poor efficiency and the problem with the coolin...
For more information and pictures on the Czech forum http://forum.fotonmag.cz/index.php?showtopic=436&st=40&start=40 on 17/9/2009 (in Czech).
http://www.murata-ps.com/data/power/lsm2-t30-d12.pdf
Technical parameters DC-DC switch are amazing:
Iout = 30A (set to ~15A) (Uout = 0,8-3,6 V) total 125W!
Uout = 0.8-5V
Uin = 5-15V
Size 33x13,5mm
Efficiency 94%!
Price € 25
-the OFF-mode (electronically) flows into switch regulator 0.9 mA (at uin = 8.4 V), but this is still very much ..
-it is a voltage buck regulator, which is totally unsuitable for LED. It must reckon with the fact, that when the LED heat up, current to the LED is larger. This can be easily solved with PTC thermistor ...
-so strong boost converter is not, and if yes, it was very expensive.
DC-DC switch LSM2 T30 W12 is very small!!!
I cleaned the thread Romisen, because the current of 2x18650 is 7-8A.
I made for DC-DC switch auxiliary PCB with a special spring. On the PCB is soldered 40x10uF capacitors Taiyo Yuden with 50miliohm ESR for DC-DC switch.
Added 3-mode switch. Each mode is arbitrarily set by trimmer.
Comparison with the original (15W) DC-DC switch
Cooler for P7 with thread, this is not original.
Drilling 1,5mm holes with thread gave me a lot of work. SSC P7 are soldered to Cu washer. It was difficult, because the whole washer must be warmed up
220 °C. On the picture is also seen PTC thermistor for temperature compensation.
This is a komplete flashlight.
Technical parameters:
Mid: 20W (efficiency 105 lm/W*20=2100lm!)*
Low: 5W (efficiency 120 lm/W*5=600lm!)*
High 50W (current over 15A)*
On high 50W is between 4300-4800 lm
*These mode's is not PWM
With 2xPanasonic 2900mAh:
Mid: 1hour
Low: 4hours
High: 20min
Theoretically SSC P7 DSVMI has 2,8A/3,25V(testing) and 800-900lm => 88-99 lm/W!
The 6xSSC P7 DSVMI => 6*2,8A*3,25V=> 54,6W*88lm/W=> min 4800lm (max 5400lm)!!!
I could set even more power: 60-70W or more :naughty: - over 55OO lm, but then is poor efficiency and the problem with the coolin...
For more information and pictures on the Czech forum http://forum.fotonmag.cz/index.php?showtopic=436&st=40&start=40 on 17/9/2009 (in Czech).
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