Performance with LED loads

AN3410

14/28

Doc ID 018890 Rev 1

4

Performance with LED loads

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