Peche
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- Joined
- Jul 2, 2015
- Messages
- 17
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Hi everyone, today I killed a BDR-209 and I'm not sure what actually killed it :yabbem:. I recently got it from DTR (the one with the copper module + driver + G2 lens), I was doing the first tests to see if it arrived ok, in the picture is the setup used.
The procedure was the following:
First I setted the PS to 5V and a maximum output current of 2A, following the indications from DTR's ebay post.
Then turned off the PS, connected the leads as shown, then turned the PS on again. The diode was working alright with the PS indicating that around 1A was being drained, the heatsink was slightly warm I checked with an IR thermometer and it was around 55°C. I kept it on for about 5 min.
After 2 min turned it on again and started to try to focus the beam, checked the temp again and it was still around 55°C. When I focused the beam it started to burn the closet door, so I turned the PS off. Again the laser was kept on for about 5 min.
I retuned with a piece of wood to point the laser, but this time when I turned on the PS the laser dot was dim, I checked the PS and the output current was of 600mA. Then it started to get dimmer quickly until no light can be seen. The final current from the PS was around 22mA. After that the laser won't turn on again.
I haven't done more tests after that, preferred to ask first before making another mess. I read (here) that you don't want this 405 to get even warm becase it will fail. But in that case the diode would've have failed during one of the first two tests instead of the during the start of the third? or maybe a transient from the startup of the PS killed it when I turned it on the third time? but in the case of a transient one would expect an instant death instead of the beam getting dimmer.
I'm not sure about what killed the diode so i would aprecciate any help to figure this out, also any tips for perfoming this kind of test safely in order to avoid killing more diodes in the future. (sorry for any mistakes in my english)
P.S.: I would use this opportunity to thank DTR for the awesome service, the whole module whas carefully packaged with a lot of bubble wrap and it arrived without a scratch, here in Chile packages usually arrive with some sort of damage.
The procedure was the following:
First I setted the PS to 5V and a maximum output current of 2A, following the indications from DTR's ebay post.
Then turned off the PS, connected the leads as shown, then turned the PS on again. The diode was working alright with the PS indicating that around 1A was being drained, the heatsink was slightly warm I checked with an IR thermometer and it was around 55°C. I kept it on for about 5 min.
After 2 min turned it on again and started to try to focus the beam, checked the temp again and it was still around 55°C. When I focused the beam it started to burn the closet door, so I turned the PS off. Again the laser was kept on for about 5 min.
I retuned with a piece of wood to point the laser, but this time when I turned on the PS the laser dot was dim, I checked the PS and the output current was of 600mA. Then it started to get dimmer quickly until no light can be seen. The final current from the PS was around 22mA. After that the laser won't turn on again.
I haven't done more tests after that, preferred to ask first before making another mess. I read (here) that you don't want this 405 to get even warm becase it will fail. But in that case the diode would've have failed during one of the first two tests instead of the during the start of the third? or maybe a transient from the startup of the PS killed it when I turned it on the third time? but in the case of a transient one would expect an instant death instead of the beam getting dimmer.
I'm not sure about what killed the diode so i would aprecciate any help to figure this out, also any tips for perfoming this kind of test safely in order to avoid killing more diodes in the future. (sorry for any mistakes in my english)
P.S.: I would use this opportunity to thank DTR for the awesome service, the whole module whas carefully packaged with a lot of bubble wrap and it arrived without a scratch, here in Chile packages usually arrive with some sort of damage.
