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

  1. #31
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    Default Re: High efficient 5A/9A Buck Converter

    Quote Originally Posted by aurum View Post
    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@ 8A
    Thanks, now i understand it

    @Der Wichtel
    Do you know when the multi mod driver will be available?
    Last edited by Kaulquappe; 06-03-2010 at 01:04 PM.

  2. #32
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    Default Re: High efficient 5A/9A Buck Converter

    Quote Originally Posted by Kaulquappe View Post
    But why are there several lines and not only one?
    Because it was tested under multiple output conditions.

  3. #33
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    Default Re: High efficient 5A/9A Buck Converter

    Quote Originally Posted by Stereodude View Post
    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.
    Well, it is not a real mistake. The driver still works but with reduced output.

    Quote Originally Posted by aurum View Post
    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
    That is correct, thanks for the quick answer.


    I'm keeping a list of changes for the next datasheet update.
    Next time there will be efficiency graphs with 5A and 9A output however they won't be much different.

    If there is anything else that is unclear, please let me know

  4. #34
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    Default Re: High efficient 5A/9A Buck Converter

    Quote Originally Posted by Drywolf View Post
    It's the left pic below which must be potted closest to the heatsink, right? Should I pot the entire assembly?
    Thanks,
    Frank
    It's enough to glue the left pic which can be glued with heat conductive glue to the heatsink
    You don't have to pot everything

  5. #35

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

    Received mine today, thank you. I'm using a Britelumens sst-90 heatsink which doesn't accomdate the preinstalled 18 gauge wire. Any advice?

  6. #36
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    Default Re: High efficient 5A/9A Buck Converter

    Der Wichtel: Can you tell us when the multi mods driver will be available?

    Regards Luca

  7. #37
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    Default Re: High efficient 5A/9A Buck Converter

    Quote Originally Posted by Nenth View Post
    Received mine today, thank you. I'm using a Britelumens sst-90 heatsink which doesn't accomdate the preinstalled 18 gauge wire. Any advice?
    The only thing you can do is replacing the wires I think or widen the holes.
    With 9A the losses are pretty high on thin wires.

    Quote Originally Posted by Kaulquappe View Post
    Der Wichtel: Can you tell us when the multi mods driver will be available?

    Regards Luca
    Sorry but I can't really say when I have them. Currently all LED projects are paused because I need to finish another project this month for university:
    http://www.youtube.com/watch?v=kJVJ3MyinGA

  8. #38
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    Default Re: High efficient 5A/9A Buck Converter

    Quote Originally Posted by Der Wichtel View Post
    Sorry but I can't really say when I have them. Currently all LED projects are paused because I need to finish another project this month for university:
    How can you let your schoolwork take priority over making a bunch of random crazy flashlight fanatics you know from the internet happy?

    Clearly you don't have your priorities straight.

    Just kidding...

    On a serious note you need to make a multi-level 5A driver so you can offer a 3 x SST-50 version of your 3 x MCE / P7 kit.

  9. #39
    Flashaholic* PapaLumen's Avatar
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    Default Re: High efficient 5A/9A Buck Converter

    Not to mention a multimode 9A driver for the 3 x sst-90 kit

  10. #40
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    Default Re: High efficient 5A/9A Buck Converter

    Quote Originally Posted by PapaLumen View Post
    Not to mention a multimode 9A driver for the 3 x sst-90 kit
    What kind of batteries do you plan on using for that?

  11. #41
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    Default Re: High efficient 5A/9A Buck Converter

    Who knows, 4D dual-bored 8 x imr18650?
    Last edited by PapaLumen; 06-05-2010 at 09:40 PM.

  12. #42
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    Default Re: High efficient 5A/9A Buck Converter

    Quote Originally Posted by PapaLumen View Post
    Who knows, 4D dual-bored 8 x imr18650?
    4 X 18650 would be too long for a 4D

  13. #43
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    Default Re: High efficient 5A/9A Buck Converter for SST-50, SST-90

    I can't find L+ or L- on the board. Can you tell me which wires are correct out. I'm guessing orange is L+, and Grey is L- ??
    Vinh K40. Vinh S6330. Vihn X10. Vinh TX25C2. Vinh RRT-01. Vihn XM-L2 P60 Thrower (40K Lux!!) Three Oveready Z2's. One Oveready C2. Two Zebralight H31's.

  14. #44
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    Default Re: High efficient 5A/9A Buck Converter for SST-50, SST-90

    Quote Originally Posted by kengps View Post
    I can't find L+ or L- on the board. Can you tell me which wires are correct out. I'm guessing orange is L+, and Grey is L- ??
    That's correct.


    Quote Originally Posted by Norm View Post
    4 X 18650 would be too long for a 4D
    4x 18650 do fit in a 4D

  15. #45
    Flashaholic* PapaLumen's Avatar
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    Default Re: High efficient 5A/9A Buck Converter for SST-50, SST-90

    Indeed they do as my newly completed 4D 3xp7 4x18650 mag would suggest.
    Cheers DW , pics soon.
    Although its a different ball game to have dual bore, it would have to continue into the tailcap.

  16. #46
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    Default Re: High efficient 5A/9A Buck Converter for SST-50, SST-90

    Quote Originally Posted by Der Wichtel View Post
    That's correct.



    4x 18650 do fit in a 4D
    I worded that badly, 4 may fit because you can use the extra depth in tailcap, but would 4D dual-bored 8 x imr18650 really fit as you can no longer use the extra length in the tailcap?

  17. #47
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    Default Re: High efficient 5A/9A Buck Converter for SST-50, SST-90

    for 1x SST-50 5A driver

    It's my 5th driver from you now .

    rayman
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  18. #48
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    Default Re: High efficient 5A/9A Buck Converter for SST-50, SST-90

    This is a very long shot due to resistive losses, but will there be be a converter any time soon with an output of 13.5A? Hoping to drive a CBT-90 at max output (evidently not in a small torch!).

    Also, how conservative is the 20V max input spec? Given that 5 Li-Ions in series gives 21V when fully charged, it seems a pity to be just 1 volt over.
    Last edited by Th232; 06-19-2010 at 04:45 AM.
    Finning does help dissipate heat. This is why the fins are removed before cooking fish. Otherwise it will throw off the heat and not reach the proper cooking temperature. --Duglite

  19. #49
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    Default Re: High efficient 5A/9A Buck Converter for SST-50, SST-90

    Currently the inductor and the heat is the limiting factor.

    So theoretically with thicker inductor wires and a bigger core it should be possible. But I'm already having problems winding the currend inductor wires with 1.2mm dia.

    I got the input voltage up to 24V but I wouldn't go higher since the capacitors are only rated at 25V
    Last edited by Der Wichtel; 07-18-2010 at 03:23 AM.

  20. #50
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    Default Re: High efficient 5A/9A Buck Converter for SST-50, SST-90

    Thanks for the info! My build just became a fair bit easier.

    Can understand the issues with winding wire that thick, didn't know you made them by hand though! Very neat. If you ever do make a higher power version though, I'll definitely be up for one.
    Finning does help dissipate heat. This is why the fins are removed before cooking fish. Otherwise it will throw off the heat and not reach the proper cooking temperature. --Duglite

  21. #51

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

    1 x SST-90, 9A driver please.
    Last edited by Mdemon; 06-23-2010 at 03:04 PM.
    Thread-killer.

  22. #52
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    Default Re: High efficient 5A/9A Buck Converter for SST-50, SST-90

    @Der_Wichtel
    Any News about the multimod driver?

  23. #53
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    Default Re: High efficient 5A/9A Buck Converter for SST-50, SST-90

    Sorry but had not time to work on that. Maybe in a few months

  24. #54

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

    Can this driver be used in an automotive application?

    Will it survive the surges and dirty inputs?
    Maker of Aspheric Lenses and Headlamps.

  25. #55
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    Default Re: High efficient 5A/9A Buck Converter for SST-50, SST-90

    I don't know if it can be used. How high are the voltage ripples?
    Unfortunately I don't have a car.
    Adding some capacitors and a mosfet should work I think.

  26. #56

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

    Quote Originally Posted by Norm View Post
    I worded that badly, 4 may fit because you can use the extra depth in tailcap, but would 4D dual-bored 8 x imr18650 really fit as you can no longer use the extra length in the tailcap?
    yep,
    4 fit fine i have 20w mr16 running on 4 18650, and you need space in the tailcap for the smaller spring, 4th 18650 stops right before the cap. that are unprotected cells, protected might be longer.
    but dual borred only will fit 3 .
    4 will stick past the thread. i tried, really no way.
    ,

  27. #57

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



    For a 9A SST-90 converter.

    snargfarg@aol.com

    Thanks,
    NC

  28. #58
    Flashaholic dan1million's Avatar
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    Default Re: High efficient 5A/9A Buck Converter for SST-50, SST-90

    Hi Der Wichtel,

    Can you apply pwm to a input on this on or alternatively can you pwm the whole circuit ?

    -Dan

  29. #59
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    Default Re: High efficient 5A/9A Buck Converter for SST-50, SST-90

    Unfortunately it is not that simple in this case otherwise I would already have a dimmable version.

  30. #60
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    Default Re: High efficient 5A/9A Buck Converter for SST-50, SST-90

    fair enough.

    i was wondering if the whole circuitcan be turend on and off via a mosfet able to handle the full supply current @ say 250Hz ?

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