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Old 11-29-2014, 09:56 AM #1
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Question Scheme for 2W m140 diode driver

Hello Guys, I just joined LPF.

I ordered 2W m140 with G2 lens(1.8 amp suggested)

Now, I need a driver scheme.I have tons of resistors, variable resistors, regulators and capacitors.

I have questions about diode's working principal
1-) Can I use 2 of LM317T regulator to give diode 5V and 3amps? Will diode die @5V 3Amps?
2-) When I give 5V 3 amps, will diode comsume 1.8amps or consume 3amps and die?
3-) Can I reduce 3amps to 1.8amps from regulator"S" output?If the answer is yes, which components can do it?
4-) Will 1.5 amps enough for m140, will diode be stable?
5-) Can I use 2 of L7805 regulator instead of LM317T?

Please help me at this sitation.Sorry for bad English.Thank you guys.


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Old 11-29-2014, 03:40 PM #2
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Default Re: Scheme for 2W m140 diode driver

1) Yes, that will toast your diode
2) You don't hold both voltage and current constant it's one or the other. Again though, 3A = toast, and relying on constant voltage of 5V is a bad strategy too.
3) This doesn't make any sense.
4) A clean regulated constant current of 1.5A from a proper constant current driver (like an xdrive) would be fine.
5) No. The 7805 isn't a constant current regulator.

I don't think you've done enough research to be building your own driver. There are major concepts that you're missing here.
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Old 11-29-2014, 03:54 PM #3
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Default Re: Scheme for 2W m140 diode driver

Can you help about building a driver? Is this scheme fine for my diode?

http://i.imgur.com/abLcZ59.png

If is not, I will send a PM for help. thank you.

Last edited by Tuuurker; 11-29-2014 at 04:12 PM.
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Old 11-29-2014, 04:34 PM #4
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Default Re: Scheme for 2W m140 diode driver

Quote:
Originally Posted by Tuuurker View Post
Can you help about building a driver? Is this scheme fine for my diode?

http://i.imgur.com/abLcZ59.png

If is not, I will send a PM for help. thank you.
What's your power source?
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Old 11-29-2014, 07:11 PM #5
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Default Re: Scheme for 2W m140 diode driver

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Originally Posted by rhd View Post
What's your power source?
Will be 2 x 18650, 3400 MAh i guess.MAh can change.

Thanks.
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Old 11-29-2014, 07:27 PM #6
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Default Re: Scheme for 2W m140 diode driver

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Originally Posted by Tuuurker View Post
Will be 2 x 18650, 3400 MAh i guess.MAh can change.

Thanks.
Then no, LM317 is not an appropriate option for an M140 diode. Too much voltage drop.

I recommend a buck driver.
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Old 11-29-2014, 08:29 PM #7
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Default Re: Scheme for 2W m140 diode driver

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Originally Posted by rhd View Post
Then no, LM317 is not an appropriate option for an M140 diode. Too much voltage drop.

I recommend a buck driver.
How can i make a driver like x-drive?I can use 3 x 18650 if it will be fine and I can use capacitors too.

Last edited by Tuuurker; 11-29-2014 at 08:31 PM.
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Old 11-29-2014, 09:10 PM #8
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Default Re: Scheme for 2W m140 diode driver

Quote:
Originally Posted by Tuuurker View Post
How can i make a driver like x-drive?I can use 3 x 18650 if it will be fine and I can use capacitors too.
No disrespect intended, but based on your initial questions, I think building a switching buck or boost is a couple levels above where you're at right now. But if you are intent on building your own, give this a read:

www.linear.com/docs/4120

Linear drivers have their place, but that place isn't driving M140s. 3x lithiums would imply 12+ Watts of heat from your driver at full charge, and 2x isn't enough to clear the vdrop once voltage sags.

Go with a switching buck or boost. That's my recommendation. That's how people drive them reliably. No need to try and reinvent the wheel.
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Old 11-29-2014, 10:41 PM #9
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Default Re: Scheme for 2W m140 diode driver

Quote:
Originally Posted by rhd View Post
No disrespect intended, but based on your initial questions, I think building a switching buck or boost is a couple levels above where you're at right now. But if you are intent on building your own, give this a read:

www.linear.com/docs/4120

Linear drivers have their place, but that place isn't driving M140s. 3x lithiums would imply 12+ Watts of heat from your driver at full charge, and 2x isn't enough to clear the vdrop once voltage sags.

Go with a switching buck or boost. That's my recommendation. That's how people drive them reliably. No need to try and reinvent the wheel.
I am really appreciated, but this text is just too much for my english."when you are not busy and can't find something to do" pls send me a parts list and scheme, I'll buy them.I am waiting for hearing from you soon.

Thanks Sir
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Old 11-29-2014, 10:53 PM #10
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Default Re: Scheme for 2W m140 diode driver

Quote:
Originally Posted by Tuuurker View Post
I am really appreciated, but this text is just too much for my english."when you are not busy and can't find something to do" pls send me a parts list and scheme, I'll buy them.I am waiting for hearing from you soon.

Thanks Sir
The part you are looking for is called:

- X-drive V6 1.8A
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- Info release from Laserglow - Default Canadian restrictions on portable lasers (link)
- The Necessity of Safety Goggles (link)

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