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AN4376 Folha de dados(PDF) 18 Page - STMicroelectronics

Nome de Peças AN4376
Descrição Electrónicos  10 W wide range non-isolated high power factor LED driver using HVLED815PF
PDF  37 Pages
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Fabricante Electrônico  STMICROELECTRONICS [STMicroelectronics]
Página de início  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN4376 Folha de dados(HTML) 18 Page - STMicroelectronics

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Measurement results
AN4376
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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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