What Driver for MC-E?

[Doc Savage]

Looking for Suggestions for 17mm dia driver for an MC-E driven by 18650. I can either have parallel or serial MC-E. Thanks to everyone in advance.

 

[AaronM]

Maybe this will help:

http://www.candlepowerforums.com/vb/showthread.php?t=188227

 

[spencer]

A shark with the sense resistor changed to give only 700mA output. This would work for the MC-E wired in series.

 

[Nos]

my MC-E is fine with 1000ma each die in my shark setup :sssh:

 

[waTom]

I thought about using a 7882 driver from one of our two "suppliers" :)

Has anyone experiences in combining the two, a mc-e and a 7882 driver?

 

[olrac]

my MC-E is fine with 1000ma each die in my shark setup :sssh:

Then you are overdiriving them and shortening the emitter life I would guess, by how much I don't know

 

[Doc Savage]

my MC-E is fine with 1000ma each die in my shark setup :sssh:

Are the 4 dies soldered in parallel or series or parallel/series ?

 

[Doc Savage]

Could I use a GD750 Driver from the shoppe to drive one MC-E in parallel? I know it is 14mm and not 17mm in dia, but I might just have customize converter canister if I can't find a 17mm driver.

 

[TexLite]

Yes you can.As long as you mean straight parallel,it won't work for 2S2P or Serial.You could also stack 2 GD or 2 Nexgen wired in parallel if you have the height available.

The linear regulators based on the AMC7135 are 17mm and would work off of one Li-Ion.One is available with 1400mA output current,350mA to each die in parallel.The linear regulator won't have the constant current regulation of the drivers from the Shoppe however.

-Michael

 

[Doc Savage]

So there isn't a way to drive all four die to 700mA with a single driver? I am looking to get max brightness and not worried about runtime.
And am I correct in assuming that this is the max you can put into each die?

 

[waTom]

I think a 7882 driver with a mc-e wired 2s2p might work.

eprom used it with a incan bulb and according to his pictures and I think it should drive a mc-e wired 2s2p, too.

http://www.candlepowerforums.com/vb/showthread.php?t=176180

However, I'm not sure :)

 

[Doc Savage]

If anybody can answer this for me it would probably help me figure this out myself. so each die can take 700mA max then if the MC-E is mount on a parallel PCB should the max going into the PCB be no greater than 700mA?

And if the MC-E is mounted on a serial PCB would the max to the PCB be 2.8A (4 x 700mA = 2.8A)

And in the 2P/2S configuration max to PCB connections would be 1.4A

Is this correct? Or do I have it backwards?

 

[TexLite]

So there isn't a way to drive all four die to 700mA with a single driver? I am looking to get max brightness and not worried about runtime.
And am I correct in assuming that this is the max you can put into each die?

Yes,700mA per die is the max recommended input current.

The new Blue Shark might drive all for die @700mA from a large Li-Ion,on paper at least.But its too big to fit your requirements.It would pull about 4A out of the cell at 3V,which is the maximum safe input current for the driver.The advantage would be constant current output.

If you don't need multi-modes,just max out,then it might be possible to build a 7135 style driver sandwich or hybrid.The 1400mA version has four chips,if your handy with a soldering iron you could add an additional four chips on top of the existing,it would put them in parallel for 2.8A output.It would be shorter than a true sandwich style and retain the 17mm diameter requirement.This would be semi-regulated,because of the characteristics of the linear chips.My guess is though it wouldn't output the full 2.8A,but it might be reasonable.

I don't have any idea whether that DX board would work or not,there aren't enough specs to know and there are different models being shipped.

-Michael

 

[TexLite]

If anybody can answer this for me it would probably help me figure this out myself. so each die can take 700mA max then if the MC-E is mount on a Serial PCB should the max going into the PCB be no greater than 700mA?

And if the MC-E is mounted on a serial PCB would the max to the PCB be 2.8A (4 x 700mA = 2.8A)

And in the 2P/2S configuration max to PCB connections would be 1.4A

Is this correct? Or do I have it backwards?

I typed the other reply before I saw this one.

Yes,with the one correction you have it correctly.



-Michael

 

[Doc Savage]

I typed the other reply before I saw this one.

Yes,with the one correction you have it correctly.



-Michael

so than And if the MC-E is mounted on a Parallel PCB would the max to the PCB be 2.8A (4 x 700mA = 2.8A)

And in the 2P/2S configuration max to PCB connections would be 1.4A

Sorry if this are really basic questions, but I really do appreciate all your help

 

[TexLite]

so than And if the MC-E is mounted on a Parallel PCB would the max to the PCB be 2.8A (4 x 700mA = 2.8A)

And in the 2P/2S configuration max to PCB connections would be 1.4A

Sorry if this are really basic questions, but I really do appreciate all your help

Yes,all correct.

I think your only option might be the linear regulator,because the size requirements,the Shark unfortunately is too big.

That or direct drive in parallel if you have some way to measure the current.

Your welcome,glad to be able to help.

-Michael