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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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AN4376 데이터시트(PDF) 18 Page - STMicroelectronics |
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AN4376 데이터시트(HTML) 18 Page - STMicroelectronics |
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18 / 37 page  Measurement results AN4376 18/37 DocID025380 Rev 1 6.5 Driver efficiency at nominal load The LED driver efficiency is up to 89%. Figure 15. Efficiency vs. AC line voltage at nominal load Efficiency at Japanese range is around 87% and increases to 88% at European voltage. 6.6 LED driver performance varying the number of LEDs The performance of the LED driver has been collected varying the LED number and as consequence the string voltage drops after a thermal warm-up (T = 1 h). In Table 2 are shown the descriptions of the loads applied and corresponding to a total voltage drop after a warm-up: Table 2. LED string voltage specification LED number String voltage drop Variation respect to nominal voltage 23 LEDs 68.3 VDC - 2.4% 25 LEDs 74.0 VDC + 5.7% 21 LEDs 62.3 VDC - 11% 18 LEDs 53.2 VDC - 24% |
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