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Thread: High efficient 5A/9A Buck Converter for SST-50, SST-90

  1. #1

    Default High efficient 5A/9A Buck Converter LED Driver for SST-50, SST-90



    The wait is finally over.

    There are two driver versions: 5A and 9A (please specify while ordering).

    Here are the specs:

    - High efficiency ( 94% - 98%)
    - Input voltage range: 6V-22V
    - Output current: fixed to 5A or 9A
    - The input voltage must be at least 2V higher than the output voltage, otherwise output current will get lower.
    - 1mm˛ silicone wires preinstalled
    - Diameter: 26mm
    - Height: 13mm

    The driver must be potted to the heatsink, at least if output power goes over a single SST-90.

    More information can be found in the datasheet:
    http://www.wichtel.kilu.de/images/us...werBuck_DS.pdf
    Please read it closely until the last page

    and as always please contact me via pm or email for order information.


    Price:
    standard version 35 Euro
    adjustable version 41 Euro

    Shipping:
    ( only has to be paid once each order)
    - Germany 2.20 Euro
    - International 3.45 Euro

    - optionally registered mail 2.15€

    Shipping can take a little bit longer because soldering these drivers became much harder

  2. #2
    Flashaholic* Icarus's Avatar
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    Default Re: High efficient 5A/9A Buck Converter

    I'll take one (5A).

    Last edited by Icarus; 05-19-2010 at 03:40 PM.

  3. #3
    Flashaholic* SmurfTacular's Avatar
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    Default Re: High efficient 5A/9A Buck Converter

    NICE!!!! Can't wait to get a hold of one! I'll definitely buy one when I get my funds together.
    I have a few questions if you don't mind.

    Will these be available with multiple modes? Or even (as donn mentioned) a potentiometer/dimmer?

    What gauge of wire would you recommend? is 18 gauge OK?

    How exactly do you mount the driver onto the heatsink?
    Last edited by SmurfTacular; 05-19-2010 at 03:58 PM.

  4. #4
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    Default Re: High efficient 5A/9A Buck Converter

    I'll take two 9A and one 5A model.

    Last edited by Drywolf; 05-19-2010 at 04:14 PM.

  5. #5
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    Default Re: High efficient 5A/9A Buck Converter

    Quote Originally Posted by SmurfTacular View Post

    Will these be available with multiple modes?
    Or can they be used in conjunction with one of George's dimmers?

  6. #6

    Default Re: High efficient 5A/9A Buck Converter

    Hi,
    unfortunately it is not possible to dim the output.
    The regulation is a little bit complex so that simple pwm won't work.

    the dimming part on this one will be as difficult to realize as the driver part. I'm working on it and I already have two ideas of how to do it.

    One simple way and one much more difficult. The circuit for the simple way is already on the driver but I don't think it will work that easy. Well only a test will clarify which way will work.

    The more difficult way will be able to use a potentiometer AND a microcontroller.

    Good night

    EDIT: 18 gauge / 1mm heat resistant silicon wires are preinstalled. Potting can be done with Arctic Alumina for example.
    I'm using epoxy mixed with 65% aluminiumoxid which works very good for this. Besides of that it is cheap

  7. #7
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    Default Re: High efficient 5A/9A Buck Converter

    just saw this, super cool!

  8. #8
    Flashaholic* TorchBoy's Avatar
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    Default Re: High efficient 5A/9A Buck Converter

    Quote Originally Posted by Der Wichtel View Post
    Here are the specs:

    - High efficiency ( 90% - 98%)
    - Input voltage range: 7V-20V
    - Output current: fixed to 5A or 9A

    ...

    More information can be found in the datasheet:
    Datasheet ( let me know if there is something unclear or somthing I should add )
    The datasheet appears to indicate 6 V to 20 V and 5.6 A or 8.6 A. Which is it?
    No, a torch does not always mean flames.
    Ian.
    LED Driver List - now database driven and with new search features.

  9. #9

    Default Re: High efficient 5A/9A Buck Converter

    Quote Originally Posted by TorchBoy View Post
    The datasheet appears to indicate 6 V to 20 V and 5.6 A or 8.6 A. Which is it?
    It should be 6-20V.

    The efficiency tests were done with 5.5A and 8.6A because I did not have the correct current setting resistors during the test. However the results are similar.

    Just saw that you have a list of drivers. Nice work!
    So the correct values for your table are:

    Vin: 6-20V
    Number of LEDs: 1-4
    Efficiency: 90%-98%
    Output Current: 5A / 9A
    Number of Modes: 1
    dimension: 26mm diameter, 13mm high

  10. #10
    Flashaholic* TorchBoy's Avatar
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    Default Re: High efficient 5A/9A Buck Converter

    Quote Originally Posted by Der Wichtel View Post
    So the correct values for your table are: ...
    Right, done. Good work, BTW - the 9 A model in particular fills the gap at the top end very nicely.
    No, a torch does not always mean flames.
    Ian.
    LED Driver List - now database driven and with new search features.

  11. #11
    Enlightened
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    Default Re: High efficient 5A/9A Buck Converter



    43.05 Euro sent for:

    9A Buck Converter: 35 Euro
    Outside Europe: 6 Euro
    additionally registered mail: 2.05 Euro
    Jimmy


  12. #12
    Enlightened
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    Default Re: High efficient 5A/9A Buck Converter

    Does the driver shut off below 6v?
    Jimmy


  13. #13

    Default Re: High efficient 5A/9A Buck Converter

    The cut off voltage is 4.5V.
    If the voltage is below 6V output current will decrease slightly

  14. #14
    Flashaholic* lucca brassi's Avatar
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    Default Re: High efficient 5A/9A Buck Converter

    Work of Art ...... Respect!!

    How you done with heat manegment ?....max temp?

    Some potting in the Al or Cu capsule will maybe reduce temp.

    You use PWM I think or current walley on uC ?

    Regards!

  15. #15

    Default Re: High efficient 5A/9A Buck Converter

    Quote Originally Posted by lucca brassi View Post
    How you done with heat manegment ?....max temp?

    Some potting in the Al or Cu capsule will maybe reduce temp.
    yes, as described in the first post.

    Quote Originally Posted by lucca brassi View Post
    You use PWM I think or current walley on uC ?

    Regards!
    no modes yet

  16. #16

    Default Re: High efficient 5A/9A Buck Converter

    for 1 9A

    Cheers

  17. #17

    Question Re: High efficient 5A/9A Buck Converter

    Hi, I'm interested in driving SST-90s with this and I'm using a 10x10Ah 1.2v D cell NiMH battery pack. As I don't want to fry the battery pack (nor the SST-90s), what configuration would you recommend as being "safe" please?

    Can I drive three or four SST-90s at the same time or just one? What would be best with your driver please? (I'd go 5A or 9A on your recommendation)

    Sorry for the Noob question but I don't want a moment!
    Thread-killer.

  18. #18
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    Default Re: High efficient 5A/9A Buck Converter

    Quote Originally Posted by Mdemon View Post
    Hi, I'm interested in driving SST-90s with this and I'm using a 10x10Ah 1.2v D cell NiMH battery pack. As I don't want to fry the battery pack (nor the SST-90s), what configuration would you recommend as being "safe" please?

    Can I drive three or four SST-90s at the same time or just one? What would be best with your driver please? (I'd go 5A or 9A on your recommendation)

    Sorry for the Noob question but I don't want a moment!
    that's an easy one. you would wire the LEDs in series. as long as your battery pack is more than 2V higher than the Vf total of your LEDs it will run at 5A or 9A. For simplicity if your LEDs were 3.5V each, you could only run AT MOST 3 LEDs with your battery pack, assuming the cells in your pack are in series for 12V.

  19. #19

    Default Re: High efficient 5A/9A Buck Converter

    Thank you. Is it as simple as that? 3 x 3.5 = 10.5v + whatever else is needed. That would mean that the thing would be out of regulation pretty quick wouldn't it? How long would that be?

    Would 2 x SST-90s mean I could use around half of the battery power "within regulation"? Math not my strong point...
    Thread-killer.

  20. #20

    Default Re: High efficient 5A/9A Buck Converter

    Yes, it will be out of regulation very fast and the output will get lower.
    Furthermore there are voltage drops at the switch and the cables.

    With 12V I wouldn't use more than 2x SST-90. But with one or two more NiMh batteries you can think of powering up 3 LEDs. However keep in mind that your batteries must be able to handle the current

  21. #21
    Flashaholic
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    Default Re: High efficient 5A/9A Buck Converter

    Got my 5A driver yesterday ... it works just perfectly. I used it to replace the faulty driver of a Trustfire ST-50 light. Thinking about the cooling of the driver took me a while. The hint using aluminiumoxid mixed with epoxy is probably good, but I had no clue where to get aluminiumoxid quickly without a couple of days "delay" . So I used the classic approach: Using (lots) of arctic alumina to connect the important parts of the PCB to an aluminiun piece which itself is glued to the light engine. Should be fine with approx. 1.2W loss at the driver. Powered by 2x protected 18650 battery current starts just below 3A, so I´m pretty sure that the SST-50 gets its full 5 amps.

    Now I got a fully powered SST-50 light, which is now the brightest light in my collection, but I doubt that it will be more than a seldom used demo light. Too much heat for the small body and compared to a Mag host with 4x XR-E, the lumen advantage of the SST-50 is barely visible ... maybe I should order a top bin SST-50 from Fred or even jump onto the SST-90 train

    Thanks Yitao for this nice driver!

    One small suggestion is that you could add the pin positions to the datasheet, or maybe the color code of the wires too. A small sketch of the PCB with the pin locations marked would be helpful. V+ and GND markings are easy to find on the PCB, aside from clear wire colors. But on the output side it took me a while to find the L+ mark and I couldn´t find a L- ... color wires are helpful, but I heard rumors that there are lots of color-blind people out there
    Last edited by rantanplan; 05-27-2010 at 07:04 AM.

  22. #22

    Default Re: High efficient 5A/9A Buck Converter

    Nice to hear that it worked fine.

    The writing on the pcb is not very good indeed. I think I chose a too small size for it.

    I will change it in the next update, thanks for the info.

  23. #23
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    Default Re: High efficient 5A/9A Buck Converter

    rantanplan, jump on the '90 train. Even at 5A it should blow you away.
    Fiend got into light re-hab. Getting out for now

  24. #24
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    Default Re: High efficient 5A/9A Buck Converter

    Quote Originally Posted by Drywolf View Post
    I'll take two 9A and one 5A model.

    Got mine today!
    Thanks.

  25. #25
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    Default Re: High efficient 5A/9A Buck Converter

    Quote Originally Posted by Der Wichtel View Post
    I'm using epoxy mixed with 65% aluminiumoxid which works very good for this.

    It's the left pic below which must be potted closest to the heatsink, right? Should I pot the entire assembly?
    Thanks,
    Frank

  26. #26
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    Default Re: High efficient 5A/9A Buck Converter

    DW, I believe you have a mistake in your datasheet. In the efficiency graph on the top of the 2nd page the red line is labeled 13.5V @ 5.6A, but it shows input voltages all the way down to 10V. Since, Vin must be greater Vout on a buck converter, something isn't quite right there.

  27. #27
    Flashaholic aurum's Avatar
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    Default Re: High efficient 5A/9A Buck Converter

    no ... vin is 10-20V, vout is lower (there is no graph for Vout). Iout is 5.6A ... 13.5v is just an example to calculate the generated heat (13.5*5.6=75.6W Pin / -> Pin*efficiency=heat in W 75.6W*0.02=1.5W loss in the driver) I hope I'm right
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  28. #28
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    Default Re: High efficient 5A/9A Buck Converter

    Quote Originally Posted by aurum View Post
    no ... vin is 10-20V, vout is lower (there is no graph for Vout). Iout is 5.6A ... 13.5v is just an example to calculate the generated heat (13.5*5.6=75.6W Pin / -> Pin*efficiency=heat in W 75.6W*0.02=1.5W loss in the driver) I hope I'm right
    You can't plot efficiency unless you fix the output condition and vary the input voltage (or fix the input and vary the output). Given those graphs there must be a fixed output condition as the input is changed. For example driving 3 SST-50's in series at 5A would be the fixed output condition. You would then vary the input voltage, record the data, and create an efficiency plot.

    It seems that the output condition for the red trace is not 5.6A @ 13.5V into a dummy load.

  29. #29
    Unenlightened
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    Default Re: High efficient 5A/9A Buck Converter

    Hi, i'm trying to decode the Efficiency vs. Voltage diagram. In the Y-axis there is the efficiency in % and in the Y-axis the Vin Voltage in Volt.

    But why are there several lines and not only one?

    Regards from Switzerland

    Luca

  30. #30
    Flashaholic aurum's Avatar
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    Default Re: High efficient 5A/9A Buck Converter

    I think it's:

    first line: 1*SST-50/SST-90 @ 5.6A
    second: 3*SST-50/SST-90 @ 5.6A
    third: 1*SST-90@ 8.6A
    fourth: 3*SST-90@ 8.aA
    The Kinks - Death Of A Clown / Smokie - Living Next Door to Alice / Simon & Garfunkel - El Condor Pasa

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