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

[Kaulquappe]

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?

[Stereodude]

But why are there several lines and not only one?

Because it was tested under multiple output conditions.

[Der Wichtel]

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.

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

[Der Wichtel]

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

[Nenth]

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

[Kaulquappe]

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

Regards Luca

[Der Wichtel]

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.

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

[Stereodude]

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.

[PapaLumen]

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

[SmurfTacular]

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?

[PapaLumen]

Who knows, 4D dual-bored 8 x imr18650?

[Norm]

Who knows, 4D dual-bored 8 x imr18650?

4 X 18650 would be too long for a 4D

[kengps]

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- ??

[Der Wichtel]

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.

4 X 18650 would be too long for a 4D

4x 18650 do fit in a 4D

[PapaLumen]

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.

[Norm]

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?

[rayman]

for 1x SST-50 5A driver

It's my 5th driver from you now .

rayman

[Th232]

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.

[Der Wichtel]

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

[Th232]

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.

[Mdemon]

1 x SST-90, 9A driver please.

[Kaulquappe]

@Der_Wichtel
Any News about the multimod driver?

[Der Wichtel]

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

[ahorton]

Can this driver be used in an automotive application?

Will it survive the surges and dirty inputs?

[Der Wichtel]

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.

[alpg88]

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.
,

[Nuclear Cowboy]

For a 9A SST-90 converter.

snargfarg@aol.com

Thanks,
NC

[dan1million]

Hi Der Wichtel,

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

-Dan

[Der Wichtel]

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

[dan1million]

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 ?