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Go Back   Laser Pointer Forums - Discuss Laser Pointers > Lasers > 445nm Lasers



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Old 09-05-2011, 03:54 PM #1
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Post 1w 445nm Laser Case Pin?

Ok so I've been searching a lot around the forums, and I cant seem to find a solid answer. I want to build a lab laser using a FlexDrive v5 at 1.25a and i dont really know whether i should bridge the case pin and negative, or not. So would it work it i just wired the cathode and the anode of the diode to the - and + of the driver and just cut off the case pin. And then wired the - and + input of the driver to the - and + of my battery pack.




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Old 09-05-2011, 03:57 PM #2
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Default Re: 1w 445nm Laser Case Pin?

These diodes are case neutral, there is no electrical connection from either pin to case, so you can bond either positive or negative pin to the case pin, your choice. If you want to fully isolate the heatsink electrically, then you can do as you described, and not use the case at all.

Last edited by GBD; 09-05-2011 at 03:59 PM.
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Old 09-05-2011, 04:20 PM #3
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Default Re: 1w 445nm Laser Case Pin?

ok so i also read about esd and how bridging the case pin to the negative protects it. If i did isolate the heatsink electrically, would i need to do that? Also what would be the easiest way to isolate the heatsink?


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Old 09-05-2011, 04:38 PM #4
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Default Re: 1w 445nm Laser Case Pin?

bridging any pin won't protect you from ESD, only way I can see is maybe have -/+ shorted out during storage. What will protect you from ESD is proper handling with anti-static messures, and TVS or other transient suppression to put on the diode itself. Generally with 445nm diodes, they have been proven pretty robust, so as long as its within reason, I won't worry about it.

445nm, just do as you described and it will give you an isolated heatsink. Just so long nothing of your driver or battery comes in contact with it (if its that important). the die is already isolated from the diode's case to begin with. Reason people bridge thier pins to the case, is when it goes into a handheld host, its just easier to use your host as negative or positive. (seeing the host is typically a conductor, and will finish the circuit)

Last edited by GBD; 09-05-2011 at 04:40 PM.
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Old 09-05-2011, 07:46 PM #5
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Default Re: 1w 445nm Laser Case Pin?

oh ok thanks
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Old 09-11-2011, 06:03 AM #6
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Default Re: 1w 445nm Laser Case Pin?

Quote:
Originally Posted by GBD View Post
there is no electrical connection from either pin to case, so you can bond either positive or negative pin to the case pin, your choice.
No, that means they are isolated from the case, Hence case isolated.
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Last edited by Fiddy; 09-11-2011 at 06:03 AM.
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