Old 10-09-2010, 01:30 PM #1
Member
 
Join Date: Oct 2009
Location: Australia
Posts: 46
Rep Power: 0
HTID is on a distinguished road
HTID HTID is offline
Member
 
Join Date: Oct 2009
Location: Australia
Posts: 46
Rep Power: 0
HTID is on a distinguished road
Exclamation need help with 455nm laser, current and voltage questions... PLEASE HELP....

Hello,

i am trying to install a 445nm laser diode inside a laser projector, i have already set up the optics and the red and green diode, that all works fine,

-the 445nm is using a micro boost driver set at 500ma

my question is mainly regarding that current and voltage to use to prevent the diode from heating up too much, if i run it just of a 3.7 cr2 battery (ratted at 1000mah) the diode barely heats up so that works fine untill battery drains...

if i use an existing power source installed inside the laser projector it heats up really quickly ( the power source inside is 5.2V and 720mA)

if i use a resistor and bring the voltage down to 3.2V i am guessing the amps will remain the same at 720ma? will running it at the 3.2v with the micro boost driver prevent it from heating up so much or is it the fact that the power source inputs to the micro boost driver the 720ma and that heats it up?

and last question, if i use a regular wall adapter that outputs 3v at 150mA and plug that to the micro boost driver what will happen? will it kill the diode cause the amps are too low? i tried running it at 4.5v with 500ma and that works but diode heats up after about 3min... i dont want to blow this diode as its my last one so can i power it with 3v and only 150ma to the micro boost driver?


HTID is offline   Reply With Quote


















Old 10-13-2010, 05:56 PM #2
magonegro's Avatar
Class 1M Laser
 
Join Date: Aug 2009
Location: Spain
Posts: 190
Rep Power: 157
magonegro has a reputation beyond reputemagonegro has a reputation beyond reputemagonegro has a reputation beyond reputemagonegro has a reputation beyond reputemagonegro has a reputation beyond reputemagonegro has a reputation beyond reputemagonegro has a reputation beyond reputemagonegro has a reputation beyond reputemagonegro has a reputation beyond reputemagonegro has a reputation beyond reputemagonegro has a reputation beyond repute
magonegro magonegro is offline
Class 1M Laser
magonegro's Avatar
 
Join Date: Aug 2009
Location: Spain
Posts: 190
Rep Power: 157
magonegro has a reputation beyond reputemagonegro has a reputation beyond reputemagonegro has a reputation beyond reputemagonegro has a reputation beyond reputemagonegro has a reputation beyond reputemagonegro has a reputation beyond reputemagonegro has a reputation beyond reputemagonegro has a reputation beyond reputemagonegro has a reputation beyond reputemagonegro has a reputation beyond reputemagonegro has a reputation beyond repute
Default Re: need help with 455nm laser, current and voltage questions... PLEASE HELP....

Heatsinking is *VERY* important for this diodes. Pick up a good heatsink.
A 1000mah CR2 battery seems to me like impossible for now. It is well known that this little batts can't handle the input required by a microboost for a 445 diode.

The microboost is a boost-only driver, so you have to keep low the voltage. Lets say under 5.5v. With 5.2v 720ma you should be ok, according to microboost specs.

A 3v 150ma for a microboost at 500ma is not enough juice to work, remember that threshold current for this diodes is around 200ma.

What is feeding the current to the diode is the microboost, so if you feel that 500ma makes hot the heatsink, simply turn down the current in the microboost till your needs. If you need more light, heatsink it better. Remember these diodes runs HOT.


Quote:
Originally Posted by HTID View Post
Hello,

i am trying to install a 445nm laser diode inside a laser projector, i have already set up the optics and the red and green diode, that all works fine,

-the 445nm is using a micro boost driver set at 500ma

my question is mainly regarding that current and voltage to use to prevent the diode from heating up too much, if i run it just of a 3.7 cr2 battery (ratted at 1000mah) the diode barely heats up so that works fine untill battery drains...

if i use an existing power source installed inside the laser projector it heats up really quickly ( the power source inside is 5.2V and 720mA)

if i use a resistor and bring the voltage down to 3.2V i am guessing the amps will remain the same at 720ma? will running it at the 3.2v with the micro boost driver prevent it from heating up so much or is it the fact that the power source inputs to the micro boost driver the 720ma and that heats it up?

and last question, if i use a regular wall adapter that outputs 3v at 150mA and plug that to the micro boost driver what will happen? will it kill the diode cause the amps are too low? i tried running it at 4.5v with 500ma and that works but diode heats up after about 3min... i dont want to blow this diode as its my last one so can i power it with 3v and only 150ma to the micro boost driver?
__________________
The more you know, the more is left to know.
magonegro is offline   Reply With Quote
Reply





Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

























Privacy Policy | Advertising Disclaimer | Terms of Use


 


All times are GMT. The time now is 05:50 AM.


Powered by: vBulletin
Copyright ©2000 - 2018, Jelsoft Enterprises Ltd.
Search Engine Friendly URLs by vBSEO
Privacy Policy | Advertising Disclaimer | Terms of Use
Copyright (C) 2017 Laser Pointer Forums, LLC