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AN4376 bảng dữ liệu(PDF) 20 Page - STMicroelectronics

tên linh kiện AN4376
Giải thích chi tiết về linh kiện  10 W wide range non-isolated high power factor LED driver using HVLED815PF
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AN4376 bảng dữ liệu(HTML) 20 Page - STMicroelectronics

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AN4376
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DocID025380 Rev 1
6.8
Power factor at different LED load number
Following relation of the AN1059, the power factor performance is directly related to the
output voltage of the buck-boost. For this reason when the load is composed only by 18
LEDs corresponding to a load 30% lower the nominal specification, the power factor
remains above 0.9 only at low mains till 200 VAC.
A good power factor performance for the light market can be reached decreasing the load
from 23 LEDs to a minimum level of 21 LEDs.
Figure 17 shows the measured power factor (PF) at different LED load.
Figure 17. Power factor versus AC line voltage at different LED load



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