Thanks for the link. You have a good point there: in addition to a better thermal resistance, the older package can obviously endure a noticeably higher junction temperature
table(table#posts).
|NCSU033B|NCSU0276A|
|Tj=130°C|Tj=90°C|
Received some copper and alu. boards for testing how these UV leds fit…
The universal base boards made for both XHP70 & MK-R seem to be a better match than the ones suitable for XHP50 & XHP70. Both are perfectly usable, nonetheless :+1:
I thought so too, but considering that the solder bulges slightly up it worked without a problem. The led got pulled into it’s place once the solder started to flow.
I’ve had (the start) running yesterday without any issues. Then I decided to test the limits…
Hi again, your LED should be on it’s way to Germany as we speak.
I’ve run a test to see if these leds have the same issue…
After pushing the test-unit (the one on the DTP star) to 1.7A i had to stop the test, as I did not have proper isolation of the rest of the lab from UV bombardment.
The die seems unaffected. The star temperature reached around 56°C
Those are pretty cool, and the combination with a readily available DTP board makes them interesting.
Tempted to buy one but $20 for one led, however good the price, still makes me think twice !
That is too good a deal because I got those for free from Simon. But send me your address and you will get some anyway. (and that reminds me that someone else asked for a few of those as well, so I will have some shipping to do )
djozz, PM sent. I’ve ordered some S2+ hosts from GB for modding. Feel free to ship away any S2+ parts you don’t want to keep
The_Driver, wow that was indeed fast. Any plans on how you are going to mount the LED into your host? I’ve modded a 348 with one of these where I just soldered the LED to a rectangular copper bar 2x3x6mm and then glued to the pill…
I’ve got some more playing to do with these today. Any wishes what one should do to a de-domed or, should I say “de-windowed” UV led? :smiling_imp:
Forgot to annotate the photo.
The small die on the anode side is apparently the ESD/TVS protection diode. That fella ensures that this expensive diode does not get zapped by the static. Ain’t that sweet…
This will soon need it’s own separate thread
I’ve had some time to prepare a test of the same led at 1700mA and leave it running overnight. The thermal performance looks very promising.
I’ve then had the led running at 2000mA for an hour and it stabilized at 79°C. That’s at 285% of datasheet figures.
The power usage seemed to remain uniform despite running warmer.
Voltage and current has been logged via an Agilent 34970A data acquisition unit. I’ve ordered a set of Omega K-type thermocouple to cover temerature in the logged data…