Old 02-24-2012, 06:23 AM #1
Class 2 Laser
 
Join Date: Jan 2012
Posts: 462
Rep Power: 3528
Machinist Joe has a reputation beyond reputeMachinist Joe has a reputation beyond reputeMachinist Joe has a reputation beyond reputeMachinist Joe has a reputation beyond reputeMachinist Joe has a reputation beyond reputeMachinist Joe has a reputation beyond reputeMachinist Joe has a reputation beyond reputeMachinist Joe has a reputation beyond reputeMachinist Joe has a reputation beyond reputeMachinist Joe has a reputation beyond reputeMachinist Joe has a reputation beyond repute
Machinist Joe Machinist Joe is offline
Class 2 Laser
 
Join Date: Jan 2012
Posts: 462
Rep Power: 3528
Machinist Joe has a reputation beyond reputeMachinist Joe has a reputation beyond reputeMachinist Joe has a reputation beyond reputeMachinist Joe has a reputation beyond reputeMachinist Joe has a reputation beyond reputeMachinist Joe has a reputation beyond reputeMachinist Joe has a reputation beyond reputeMachinist Joe has a reputation beyond reputeMachinist Joe has a reputation beyond reputeMachinist Joe has a reputation beyond reputeMachinist Joe has a reputation beyond repute
Default Driver heat. Why?

Hello guys. I am powering a 445 with a 1.3A jib drive I bought off a member here. I am using the case pin for the v- supply. The laser works, and it works well, but after about 15 seconds, the driver gets too hot to touch... Why is this? I have tested it with two different drivers. I am powering them from 2 18350s in a guidesman host.


Machinist Joe is offline   Reply With Quote


















Old 02-24-2012, 06:28 AM #2
Sigurthr's Avatar
Class 3B Laser
 
Join Date: Dec 2011
Location: Michigan's U.P.
Posts: 4,382
Rep Power: 3121
Sigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond repute
Sigurthr Sigurthr is offline
Class 3B Laser
Sigurthr's Avatar
 
Join Date: Dec 2011
Location: Michigan's U.P.
Posts: 4,382
Rep Power: 3121
Sigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond repute
Default Re: Driver heat. Why?

Because you're pumping 1.3A through tiny PCB traces, components, and wires? All electronics have less than 100% efficiency, and losses are almost always turned in to either noise or heat (if not both). 2x Li-Ion = 8.4V top voltage x 1.3A (lets assume it is unrealistically efficient, there will actually be more draw from the batteries) = 10.92W of heat the components need to dissipate. IIRC the Easy Bake oven runs off a 10W bulb. Make sense now?
__________________
Amateur Multispectral Photographer - [X-Ray, UV, Vis, IR]
Amateur Electrical Engineer
Autodidact
Tesla Coil Expert
Sigurthr is offline   Reply With Quote
Old 02-24-2012, 06:32 AM #3
Class 2 Laser
 
Join Date: Jan 2012
Posts: 462
Rep Power: 3528
Machinist Joe has a reputation beyond reputeMachinist Joe has a reputation beyond reputeMachinist Joe has a reputation beyond reputeMachinist Joe has a reputation beyond reputeMachinist Joe has a reputation beyond reputeMachinist Joe has a reputation beyond reputeMachinist Joe has a reputation beyond reputeMachinist Joe has a reputation beyond reputeMachinist Joe has a reputation beyond reputeMachinist Joe has a reputation beyond reputeMachinist Joe has a reputation beyond repute
Machinist Joe Machinist Joe is offline
Class 2 Laser
 
Join Date: Jan 2012
Posts: 462
Rep Power: 3528
Machinist Joe has a reputation beyond reputeMachinist Joe has a reputation beyond reputeMachinist Joe has a reputation beyond reputeMachinist Joe has a reputation beyond reputeMachinist Joe has a reputation beyond reputeMachinist Joe has a reputation beyond reputeMachinist Joe has a reputation beyond reputeMachinist Joe has a reputation beyond reputeMachinist Joe has a reputation beyond reputeMachinist Joe has a reputation beyond reputeMachinist Joe has a reputation beyond repute
Default Re: Driver heat. Why?

Really? I thought I read somewhere that these didn't really need heatsinking. But too hot to touch after 15 seconds, I didn't think that was normal...
Machinist Joe is offline   Reply With Quote
Old 02-24-2012, 06:47 AM #4
Sigurthr's Avatar
Class 3B Laser
 
Join Date: Dec 2011
Location: Michigan's U.P.
Posts: 4,382
Rep Power: 3121
Sigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond repute
Sigurthr Sigurthr is offline
Class 3B Laser
Sigurthr's Avatar
 
Join Date: Dec 2011
Location: Michigan's U.P.
Posts: 4,382
Rep Power: 3121
Sigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond repute
Default Re: Driver heat. Why?

I don't know the specifics of the Jib driver, but even a buck driver will need heatsinking at ~11W input.
__________________
Amateur Multispectral Photographer - [X-Ray, UV, Vis, IR]
Amateur Electrical Engineer
Autodidact
Tesla Coil Expert
Sigurthr is offline   Reply With Quote
Old 02-24-2012, 06:50 AM #5
Class 2 Laser
 
Join Date: Jan 2012
Posts: 462
Rep Power: 3528
Machinist Joe has a reputation beyond reputeMachinist Joe has a reputation beyond reputeMachinist Joe has a reputation beyond reputeMachinist Joe has a reputation beyond reputeMachinist Joe has a reputation beyond reputeMachinist Joe has a reputation beyond reputeMachinist Joe has a reputation beyond reputeMachinist Joe has a reputation beyond reputeMachinist Joe has a reputation beyond reputeMachinist Joe has a reputation beyond reputeMachinist Joe has a reputation beyond repute
Machinist Joe Machinist Joe is offline
Class 2 Laser
 
Join Date: Jan 2012
Posts: 462
Rep Power: 3528
Machinist Joe has a reputation beyond reputeMachinist Joe has a reputation beyond reputeMachinist Joe has a reputation beyond reputeMachinist Joe has a reputation beyond reputeMachinist Joe has a reputation beyond reputeMachinist Joe has a reputation beyond reputeMachinist Joe has a reputation beyond reputeMachinist Joe has a reputation beyond reputeMachinist Joe has a reputation beyond reputeMachinist Joe has a reputation beyond reputeMachinist Joe has a reputation beyond repute
Default Re: Driver heat. Why?

Well, my thermal adhesive is drying right now. I will get back with the results after its dried. Thanks for your help.
Machinist Joe is offline   Reply With Quote
Old 02-24-2012, 06:51 AM #6
Sigurthr's Avatar
Class 3B Laser
 
Join Date: Dec 2011
Location: Michigan's U.P.
Posts: 4,382
Rep Power: 3121
Sigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond repute
Sigurthr Sigurthr is offline
Class 3B Laser
Sigurthr's Avatar
 
Join Date: Dec 2011
Location: Michigan's U.P.
Posts: 4,382
Rep Power: 3121
Sigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond repute
Default Re: Driver heat. Why?

Anytime, good luck with the build! Always better to have unnecessary heatsinking than insufficient heatsinking.
__________________
Amateur Multispectral Photographer - [X-Ray, UV, Vis, IR]
Amateur Electrical Engineer
Autodidact
Tesla Coil Expert
Sigurthr is offline   Reply With Quote
Old 02-24-2012, 07:09 AM #7
Class 2 Laser
 
Join Date: Jan 2012
Posts: 462
Rep Power: 3528
Machinist Joe has a reputation beyond reputeMachinist Joe has a reputation beyond reputeMachinist Joe has a reputation beyond reputeMachinist Joe has a reputation beyond reputeMachinist Joe has a reputation beyond reputeMachinist Joe has a reputation beyond reputeMachinist Joe has a reputation beyond reputeMachinist Joe has a reputation beyond reputeMachinist Joe has a reputation beyond reputeMachinist Joe has a reputation beyond reputeMachinist Joe has a reputation beyond repute
Machinist Joe Machinist Joe is offline
Class 2 Laser
 
Join Date: Jan 2012
Posts: 462
Rep Power: 3528
Machinist Joe has a reputation beyond reputeMachinist Joe has a reputation beyond reputeMachinist Joe has a reputation beyond reputeMachinist Joe has a reputation beyond reputeMachinist Joe has a reputation beyond reputeMachinist Joe has a reputation beyond reputeMachinist Joe has a reputation beyond reputeMachinist Joe has a reputation beyond reputeMachinist Joe has a reputation beyond reputeMachinist Joe has a reputation beyond reputeMachinist Joe has a reputation beyond repute
Default Re: Driver heat. Why?

Ok, I added some heatsinking, but it is still getting pretty darn hot. Is it supposed to be like this? Does it get hot and stay there or does it keep on getting hotter and hotter?
Machinist Joe is offline   Reply With Quote
Old 02-24-2012, 07:27 AM #8
Sigurthr's Avatar
Class 3B Laser
 
Join Date: Dec 2011
Location: Michigan's U.P.
Posts: 4,382
Rep Power: 3121
Sigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond repute
Sigurthr Sigurthr is offline
Class 3B Laser
Sigurthr's Avatar
 
Join Date: Dec 2011
Location: Michigan's U.P.
Posts: 4,382
Rep Power: 3121
Sigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond repute
Default Re: Driver heat. Why?

What size heatsink are you using? Is it a host heatsink or lab heatsink or generic electronics heatsink? Define hot (~90F, 100F, >110F)? How long did it take to get hot?
__________________
Amateur Multispectral Photographer - [X-Ray, UV, Vis, IR]
Amateur Electrical Engineer
Autodidact
Tesla Coil Expert
Sigurthr is offline   Reply With Quote
Old 02-24-2012, 07:37 AM #9
Class 2 Laser
 
Join Date: Jan 2012
Posts: 462
Rep Power: 3528
Machinist Joe has a reputation beyond reputeMachinist Joe has a reputation beyond reputeMachinist Joe has a reputation beyond reputeMachinist Joe has a reputation beyond reputeMachinist Joe has a reputation beyond reputeMachinist Joe has a reputation beyond reputeMachinist Joe has a reputation beyond reputeMachinist Joe has a reputation beyond reputeMachinist Joe has a reputation beyond reputeMachinist Joe has a reputation beyond reputeMachinist Joe has a reputation beyond repute
Machinist Joe Machinist Joe is offline
Class 2 Laser
 
Join Date: Jan 2012
Posts: 462
Rep Power: 3528
Machinist Joe has a reputation beyond reputeMachinist Joe has a reputation beyond reputeMachinist Joe has a reputation beyond reputeMachinist Joe has a reputation beyond reputeMachinist Joe has a reputation beyond reputeMachinist Joe has a reputation beyond reputeMachinist Joe has a reputation beyond reputeMachinist Joe has a reputation beyond reputeMachinist Joe has a reputation beyond reputeMachinist Joe has a reputation beyond reputeMachinist Joe has a reputation beyond repute
Default Re: Driver heat. Why?

I broke some fins off of a computer heatsink. Its not big, but I would expect its enough. I don't know how hot, too hot to touch, and only about 20 seconds... Maybe I got a freak LD with a really low voltage.
Machinist Joe is offline   Reply With Quote
Old 02-24-2012, 07:43 AM #10
Sigurthr's Avatar
Class 3B Laser
 
Join Date: Dec 2011
Location: Michigan's U.P.
Posts: 4,382
Rep Power: 3121
Sigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond repute
Sigurthr Sigurthr is offline
Class 3B Laser
Sigurthr's Avatar
 
Join Date: Dec 2011
Location: Michigan's U.P.
Posts: 4,382
Rep Power: 3121
Sigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond repute
Default Re: Driver heat. Why?

It is possible you have an inefficient LD, they certainly do exist. We get spoiled by all of Lazeerer, DTR, RHD, etc seeing all these 2W builds, there are a lot of meh diodes out there. Diode efficiency won't cause your driver to overheat though. I trust the diode is pressed in to a rather large heatsink or in a module inside a rather large heatsink, right?

How big of a fin? Normally a driver's heatsink isn't much bigger than the stick on chipset heatsinks, maybe 1/2" by 1" by 3/32" or so.

Again, I'm not familiar with the Jib driver, but if the laser is lasing fine and the driver's pumping out heat, it could just be an inefficient driver, and will need hefty heatsinking. I pretty much stick to LDO Linears and Flexdrives.
__________________
Amateur Multispectral Photographer - [X-Ray, UV, Vis, IR]
Amateur Electrical Engineer
Autodidact
Tesla Coil Expert
Sigurthr 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 12:02 PM.


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