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Request: 5-mode driver @ 1.8A

ryansoh3

ryansoh3

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Greetings LPF,

I've been searching around for drivers that can output 1.8A with a couple of modes, but haven't found any.

The closest I have gotten is with a DX buck driver that outputs 2.0A but I fear it will kill a M140 with its current spikes resulting from a questionable quality build.

So would anybody be brave enough to mass produce a buck or boost driver that has modes? :wave:

Seoul_Lasers told me about a professional driver but that costs 90 bucks, so it might be out of my budget.

Or I'll just mess around with the resistors on the DX driver and add a cap.

Cheers! :beer:
 





sinner

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You can use the 2A buck driver with modes and put another 1.8A linear at output instead of a cap.. that would definitely work imo!!
 
The Baron

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Seems like that would make too much heat. Wouldn't there be a big voltage drop too?
 
sinner

sinner

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Yes this would be much less efficient , but it will get the job done. A better way would be asking Lazeerer i'm sure he has all the good stuff and he is more than happy to help!!
 
LuxorLasers147

LuxorLasers147

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You Could use the AMC "AK-47" driver with 5x ICs to get 1750mA. There are alot of versions of that driver, some have 20 modes xD.

That driver can take a max of 6v.

You would also want to heatsink the ICs.
 
grainde

grainde

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Yeah I was going to suggest an AMC 7135 driver too, but it looks like DX is only selling them in bulk now. I had a quick look around and these people are selling 5 mode drivers and spare chips individually: Driver and Chip. You could buy one of these and add a chip to get 1.75A. :beer:
 
ryansoh3

ryansoh3

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Thanks guys for your helpful replies.

I guess I'll mod the driver by adding one more IC chip.

I'll document the progress here, and if I get stuck, I'll post here or ask Lazeerer for help.

If you add a linear driver onto the 2.0A one, wouldn't the hi, mid, low modes interfere with the linear driver?

Cheers!
 
benmwv

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I think you should talk to lazeerer. Get an x-drive. As far as I know he has an add on board for modes. Ask him about it, I'm sure he will hook you up.

AMC7135s aren't a good match for 445.
 
Fiddy

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yeah AMC's are linear drivers that can only regulate current up to a max of 6V input.

ive been looking for a boost or buck mode driver too!
 
grainde

grainde

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Ah good to know. Ive only used them for the mits 300's so far and theyre brilliant, but I was contemplating giving a 445 a try. I understand that a 405 might be a prob but a 445 should be do able, as I did try one on my test load set for a 445 and it worked fine? ie same current output at 445 setting and 635/650 setting.

Not sure now? :thinking:

Edit: Used the setting for an M140 at the time, ie with forward voltage of around 4.5 V. The new 9 mm 445s could be a prob though, cos these run at a higher VF.
 
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Fiddy

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ive got a amc7135 driver on a 445 A140 diode max it does is ~300mW, it all depends on your battery voltage, for 445 the higher it is the more power you will see.
 
grainde

grainde

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Ok interesting, I was using a new Panasonic 3100 and only wired it up to the test load for a few seconds. Thanks for the info Fiddy. :beer:
 
ryansoh3

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grainde said:
Ok interesting, I was using a new Panasonic 3100 and only wired it up to the test load for a few seconds. Thanks for the info Fiddy. :beer:
Click to expand...

Grainde, what was the driver output when you hooked it up with the 445 setting? I'm curious to know.
BTW, what kind of diodes are you using in the test load? I just built one myself and was wondering how many to use for M140 simulation. :thanks:

So the reason why an AMC 7135 wouldn't work is because a M140's forward voltage is too high for a single battery combination, and the driver can't take a two battery combination... right? :thanks:

Cheers! :beer:
 
grainde

grainde

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ryansoh3 said:
Grainde, what was the driver output when you hooked it up with the 445 setting? I'm curious to know.
Click to expand...

I actually had it set at 700 mA because I was preparing for the new diodes lazeerer is getting. I actually posted here about it if it helps: help with driver

ryansoh3 said:
BTW, what kind of diodes are you using in the test load? I just built one myself and was wondering how many to use for M140 simulation. :thanks:
Click to expand...

I used the ones from Jufran88's kit which uses 10 1N5404 diodes.

ryansoh3 said:
So the reason why an AMC 7135 wouldn't work is because a M140's forward
voltage is too high for a single battery combination, and the driver can't take a two battery combination... right? :thanks:
Cheers! :beer:
Click to expand...

Yes. Acording to what I understand, its because the max input voltage of the driver is 6 V, limiting us to one battery. As one Li battery will supply max 4.2 V and the driver's a linear not boost you cant get enough potential to run the 4.5 V diode esp. as the battery runs down. Maybe it worked on the test load because I had a full battery, was using such a low current and the fact that I only hooked it up to test the current.ie a couple of seconds. Ill have to check the voltage drop across a 1N5404 diode and get back to you on that....

If you could get two batteries with a total of 6 V though, Im sure it would work. I had a look at the LiFePO4 batteries, but these are 3.6 V charged and so (as with the Li's) two of them would also be too much. :beer:
 
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ryansoh3

ryansoh3

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OK, thanks for your reply. So it does output 700mA correctly when using the 445 setting, right?

Yeah, I don't think it'll be appropriate for M140s as their forward voltage is too high for both one li-ion cell and too high for two cells for the driver.

Thanks for your reply! You've been very helpful. :thanks:

Cheers! :beer:
 
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