AN3410 Datasheet, PDF (14/28 Pages) STMicroelectronics – This application note describes an LED driver

Performance with LED loads
4
Performance with LED loads
AN3410
The unit was designed to source 350 mA into a string of 18 1 W LEDs. The project goal was
to obtain the highest possible efficiency.
Table 1. Numeric data for 18-LED load
Line voltage
90 V 96 V 102 V 108 V 114 V 120 V 126 V 132 V 138 V
Input power, watts
20.5 20.77 20.82 20.61 20.51 20.46 20.31 19.95 19.48
Power factor
0.973 0.978 0.982 0.985 0.987 0.988 0.990 0.991 0.991
Output voltage
54.8 54.8 54.7 54.7 54.6 54.6 54.5 54.4 54.3
Output current, amps 0.348 0.353 0.355 0.352 0.351 0.35 0.348 0.342 0.334
Output power, watts 19.070 19.344 19.418 19.254 19.164 19.110 18.966 18.604 18.136
Efficiency%
93.03 93.14 93.27 93.42 93.44 93.40 93.38 93.26 93.10
Power loss, watts
1.429 1.425 1.401 1.355 1.345 1.350 1.344 1.345 1.343
14/28
Doc ID 018890 Rev 1