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LM80 Reliability data for STW8Q2PA
2010. 06. 10
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1. Number of LED Light Sources tested20ea per test
2. Description of LED light sourcesPKG tested: TOP 5630 Series
Part No. STW8Q2PA
3. Description of auxiliary equipmentSTW8Q2PA of the 5630 series are soldered to reliability board that can accommodate up to 20 devices. STW8Q2PA LEDs are connected in series strings of up to 20 devices and driven by constant current sources of three. Reliability boards are mounted in a reliability chamber that maintain constant thermal surrounding. The test boards are cyclically removed from the chamber for testing.
Tester: integrating Cylinder, a computer-controlled x-y table, programmable current-source meter, and relay switching-matrix. STW8Q2PA is positioned next to the cylinder and driven by a constant current source. IV, forward current, chromaticity is measured for each TOP LEDs.
4. Operating cycleLEDs are driven with a constant DC Voltage.
5. Ambient conditions including airflow, temperature and relative humidityThe case temperature within the chamber with minimal airflow was characterized by several thermocouples connecting to reliability board. Ambient temperature and the relative humidity was also characterized in the specified chambers. All test data were read after condition reached thermal equilibrium.
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6. Case temperature (test point temperature)The thermal characterization results are summarized in the table below.
7. Drive Current of the LED light source during lifetime test.@100mA
8. Lumen maintenance data and forward current along with average value, standard deviation minimum and maximum lumen maintenance value for all of the LED light sources.See table.
Required LM80 test temperature (Ts)
Forward Current Actual Ta
25℃ 100 mA 13℃
55℃ 100 mA 37℃
85℃ 100 mA 71℃
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Stress condition: Ts 25 , 100mA℃Voltage data
Stress condition: Ts 25 , 100mA℃IV data
Stress condition: Ts 25 , 100mA℃Normalized IV data
0hr 1000hr 2000hr 3000hr 4000hr 5000hr 6000hr
Max 3.172 3.159 3.196 3.205 3.218 3.207 3.211
Avg 3.068 3.068 3.078 3.077 3.084 3.070 3.092
Min 3.006 2.967 2.975 2.968 2.969 3.004 3.015
0hr 1000hr 2000hr 3000hr 4000hr 5000hr 6000hr
Max 9.522 9.401 9.399 9.369 9.339 9.288 9.229
Avg 8.651 8.511 8.461 8.444 8.419 8.394 8.324
Min 8.217 8.029 7.963 7.932 7.921 7.995 7.909
0hr 1000hr 2000hr 3000hr 4000hr 5000hr 6000hr
Max 1.000 0.999 0.997 0.995 0.992 0.996 0.993
Avg 1.000 0.984 0.978 0.976 0.973 0.970 0.962
Min 1.000 0.968 0.959 0.958 0.957 0.949 0.937
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Stress condition: Ts 55 , 100mA℃Voltage data
Stress condition: Ts 55 , 100mA℃IV data
Stress condition: Ts 55 , 100mA℃Normalized IV data
0hr 1000hr 2000hr 3000hr 4000hr 5000hr 6000hr
Max 3.225 3.263 3.263 3.278 3.279 3.275 3.279
Avg 3.149 3.158 3.152 3.160 3.164 3.167 3.177
Min 2.988 3.000 3.000 3.016 3.020 3.027 3.040
0hr 1000hr 2000hr 3000hr 4000hr 5000hr 6000hr
Max 9.173 9.113 9.108 9.099 9.068 8.952 8.779
Avg 9.025 8.917 8.810 8.781 8.760 8.670 8.584
Min 8.826 8.729 8.605 8.548 8.531 8.309 8.245
0hr 1000hr 2000hr 3000hr 4000hr 5000hr 6000hr
Max 1.000 1.000 0.999 0.998 0.995 0.986 0.970
Avg 1.000 0.988 0.976 0.973 0.971 0.961 0.951
Min 1.000 0.974 0.961 0.954 0.952 0.940 0.934
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Stress condition: Ts 85 , 100mA℃Voltage data
Stress condition: Ts 85 , 100mA℃IV data
Stress condition: Ts 85 , 100mA℃Normalized IV data
0hr 1000hr 2000hr 3000hr 4000hr 5000hr 6000hr
Max 9.170 9.101 9.028 9.007 8.984 8.821 8.778
Avg 9.092 8.888 8.812 8.759 8.732 8.610 8.507
Min 9.005 8.661 8.562 8.449 8.424 8.320 8.308
0hr 1000hr 2000hr 3000hr 4000hr 5000hr 6000hr
Max 1.000 0.999 0.990 0.987 0.986 0.968 0.961
Avg 1.000 0.969 0.969 0.963 0.960 0.947 0.936
Min 1.000 0.957 0.949 0.937 0.935 0.924 0.922
0hr 1000hr 2000hr 3000hr 4000hr 5000hr 6000hr
Max 3.15 3.16 3.17 3.18 3.19 3.18 3.18
Avg 3.24 3.27 3.28 3.29 3.30 3.30 3.29
Min 3.00 2.99 3.03 3.04 3.05 3.04 3.05
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9. Observation of LED light source failures including the failure conditions and time of failure.No failures occurred during these tests.
10. LED light source monitoring intervalTested at 0, 1000, 2000, 3000, 4000, 5000, 6000hr
11. Chromaticity shift reported over the measurement time.
Stress condition: Ts 25 , 100mA℃Chromaticity data
0 hr 1000 hr 2000 hr 3000 hr 4000 hr 5000 hr 6000 hr
Initial ᇫ u' ᇫ u' ᇫ u' ᇫ u' ᇫ u' ᇫ u'
Max. 0.0000 0.0000 -0.0005 -0.0001 -0.0008 -0.0007 -0.0013
Avg. 0.0000 -0.0005 -0.0007 -0.0008 -0.0013 -0.0015 -0.0024
Min. 0.0000 -0.0009 -0.0011 -0.0014 -0.0024 -0.0034 -0.0045
Initial ᇫ v' ᇫ v' ᇫ v' ᇫ v' ᇫ v' ᇫ v'
Max. 0.0000 0.00087 0.00043 0.0007 0.0000 -0.0007 -0.0014
Avg. 0.0000 0.00026 -0.00001 -0.0003 -0.0009 -0.0018 -0.0030
Min. 0.0000 -0.00018 -0.00053 -0.0014 -0.0026 -0.0044 -0.0049
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Stress condition: Ts 55 , 100mA℃Chromaticity data
Stress condition: Ts 85 , 100mA℃Chromaticity data
0 hr 1000 hr 2000 hr 3000 hr 4000 hr 5000 hr 6000 hr
Initial ᇫ u' ᇫ u' ᇫ u' ᇫ u' ᇫ u' ᇫ u'
Max. 0.0000 -0.0002 -0.0003 -0.0001 -0.0004 -0.0014 -0.0011
Avg. 0.0000 -0.0004 -0.0006 -0.0005 -0.0009 -0.0021 -0.0030
Min. 0.0000 -0.0008 -0.0009 -0.0012 -0.0017 -0.0026 -0.0042
Initial ᇫ v' ᇫ v' ᇫ v' ᇫ v' ᇫ v' ᇫ v'
Max. 0.0000 0.00060 0.00061 0.0006 0.0002 -0.0009 -0.0004
Avg. 0.0000 0.00037 0.00018 0.0000 -0.0004 -0.0023 -0.0036
Min. 0.0000 -0.00035 -0.00021 -0.0011 -0.0015 -0.0030 -0.0055
0 hr 1000 hr 2000 hr 3000 hr 4000 hr 5000 hr 6000 hr
Initial ᇫ u' ᇫ u' ᇫ u' ᇫ u' ᇫ u' ᇫ u'
Max. 0.0000 -0.0002 -0.0007 -0.0007 -0.0013 -0.0024 -0.0031
Avg. 0.0000 -0.0007 -0.0012 -0.0015 -0.0022 -0.0038 -0.0043
Min. 0.0000 -0.0013 -0.0019 -0.0021 -0.0028 -0.0057 -0.0058
v' ᇫ v' ᇫ v' ᇫ v' ᇫ v' ᇫ v' ᇫ v'
Max. 0.0000 -0.00014 -0.00036 -0.0020 -0.0028 -0.0030 -0.0032
Avg. 0.0000 -0.00091 -0.00112 -0.0028 -0.0037 -0.0045 -0.0050
Min. 0.0000 -0.00169 -0.00184 -0.0034 -0.0044 -0.0063 -0.0065