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Old 08-29-2010, 03:19 PM #1
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Default broke my first 445nm diode.. questions before rebuild

so i LED'd my first 445nm diode last night according to my test load with 4x in4001 (current measured with a current meter in series) the current was 640mA through the diodes. probably not enough to kill the diode. however, after taking apart the host it seems the solder connections from the microboost driver to the diode had come loose... i assume they must have disconnected for a second, then a charged capacitor on the driver board fried my diode. does anyone else think this is probably the case? also, when i turn the pot all the way up i can only get up to 860mA on my test load, but the driver manual said it can get to 1A. did I do something wrong???


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Old 08-29-2010, 03:31 PM #2
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Default Re: broke my first 445nm diode.. questions before rebuild

Quote:
Originally Posted by thebucketmouse View Post
so i LED'd my first 445nm diode last night according to my test load with 4x in4001 (current measured with a current meter in series) the current was 640mA through the diodes. probably not enough to kill the diode. however, after taking apart the host it seems the solder connections from the microboost driver to the diode had come loose... i assume they must have disconnected for a second, then a charged capacitor on the driver board fried my diode. does anyone else think this is probably the case? also, when i turn the pot all the way up i can only get up to 860mA on my test load, but the driver manual said it can get to 1A. did I do something wrong???
An intermittent connection CAN blow a diode.

If you are only getting 860mA out of a "maxed" driver, either your power source isn't up to providing the needed current load (e.g. three AAA's won't cut it), you have a bad connection, or you have some "extra" or incorrect solder bridge(s) on the driver.

Peace,
dave
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Old 08-29-2010, 04:13 PM #3
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Default Re: broke my first 445nm diode.. questions before rebuild

im using a variable dc power supply to power it at the moment, with a 3A max i believe. the current at the diode is also about 380mA at its lowest potentiometer setting. seems like it would still work fine though, i measured the current for a while and it did not waver from 640mA when I had it set to that. also, the laser ran for a while before LED'ing. i turned it off for a while and when i came back it was fried, which again leads me to believe that it was a connection problem. thanks for the tips daguin, i just really dont want to waste diode here so im trying to play it safe
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Old 08-29-2010, 07:05 PM #4
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Default Re: broke my first 445nm diode.. questions before rebuild

Are there lasorbs suitable for this diode ? That should help during experimenting.
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