www.fairchildsemi.com
4.2 Efficiency
The efficiency data shown is for the converter with a load of one, two and three LEDs driven at 1A.
Efficiency (%)
90 |
|
|
|
|
|
|
|
|
80 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| |
70 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| |
|
|
|
|
|
|
|
| |
60 |
|
|
|
|
|
|
| 1 LED @ 1 A |
|
|
|
|
|
|
| ||
50 |
|
|
|
|
|
|
| |
|
|
|
|
|
|
| ||
|
|
|
|
|
|
| 2 LEDs @ 1 A | |
40 |
|
|
|
|
|
|
| |
|
|
|
|
|
|
| ||
|
|
|
|
|
|
| 3 LEDs @ 1 A | |
|
|
|
|
|
|
| ||
30 |
|
|
|
|
|
|
| |
|
|
|
|
|
|
|
| |
|
|
|
|
|
|
|
| |
20 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| |
10 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| |
0 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| |
90 | 120 | 270 |
|
| ||||
Input Voltage (V)
Figure 8: Converter Efficiency Data Plotted Against Increasing Line Input
for LED Current of 1A.
© 2007 Fairchild Semiconductor | Page 13 of 17 | Rev 1.1 April 2007 |
