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Old 11-25-2009, 11:30 PM #1
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Exclamation TEC current settings help (DDL driver)

So, I'm building a TEC labby, and I'm planning to use a 12V 3A wall adapter (unregulated), connected to a fan (for the TEC) and a 7809 regulator (to get a 9V output). The output of this regulator will be connected to two DDL drivers, one plugged to a TEC at 600mA (the TEC is rated 10V at 1A), and the other one set to 190mA (for a 6X ASFW diode; it will also have a 50 ohm pot at the input to change the output of the diode in real time. Yes, this works; I have a labby with this setup).

First question : will this work?

Also, I made some tests with a TEC module (fan, heatsink, and TEC). I tried, using a 12V 500mA, unregulated wall adapter, to set the TEC at 400mA, but I only reached 303mA, and with a 7812 regulator, 298mA. What surprised me most is that I got the exact same results with a 9V battery and with both DDL drivers...

Anybody can explain this and help me?


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Old 11-30-2009, 10:56 PM #2
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Default Re: TEC current settings help (DDL driver)





Any help.....


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Old 11-30-2009, 10:58 PM #3
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Default Re: TEC current settings help (DDL driver)

I can tell you that you don't need anywhere near full current or voltage in the TEC to cool a laser diode, so as long as the TEC is cool I wouldn't worry. Just assemble the system and set the TEC at a decent temp within the spec for the diode. 20-25C works very well.
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Old 11-30-2009, 11:59 PM #4
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Default Re: TEC current settings help (DDL driver)

The TEC is slightly cool to the touch, I would say it's reaching 10°C.

Is this good enough?
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Old 12-01-2009, 01:18 AM #5
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Default Re: TEC current settings help (DDL driver)

As long it doesnt put too much stress on the diode it should be good at that temp.
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Old 12-01-2009, 02:29 AM #6
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Default Re: TEC current settings help (DDL driver)

Just keep in mind that at 10°C, condensation might start forming on the lens or inside the diode itself. I'd say 20°C or so would be better.
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Old 12-01-2009, 09:08 PM #7
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Default Re: TEC current settings help (DDL driver)

Ok, but I have a quite large heatsink so it should help stabilizing the temperature aroud 20 (ambient).
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