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AN4376 bảng dữ liệu(PDF) 22 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
PDF  37 Pages
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
Trang chủ  http://www.st.com
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AN4376 bảng dữ liệu(HTML) 22 Page - STMicroelectronics

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DocID025380 Rev 1
6.10
LED driver efficiency at different LED load number
Figure 19 shows the efficiency versus the line.
Figure 19. Efficiency versus AC line voltage at different LED load
Varying the number of the LEDs , the efficiency remains comparable with the nominal load,
of course increasing the load to 25 LEDs means increasing the converter output power till
11.5 W. Section 7.7: Thermal measurements on page 29 shows that the HVLED815PF
device is not overeating and is able to support this load properly.
Note:
Important: In this design a sort of short-circuit protection has been previewed, the R25 and
R26 in series with the diode have been added to sense the short-circuit of the output
connectors. If this function is not needed, the two parallel resistors could be removed and
the converter efficiency will increase of 1.5%.



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