AN2042 Datasheet, PDF (22/30 Pages) STMicroelectronics – brightness LEDs with VIPer22A-E

Experimental results
AN2042
Figure 27. Open load condition at 230 V_AC: no Figure 28. Open load condition at 230 V_AC:
dimming
minimum dimming
Ch1 freq - 613 Hz (black)
Ch2 max - 32.8 V (green)
Ch1 freq - 250 Hz (black)
Ch2 max - 33.6 V (green)
The efficiency of the system, one of the key parameters of the application, has been
measured in the whole input voltage range varying the number of LEDs from 1 to 8, and the
experimental results are shown in Figure 29.
Figure 29. Efficiency
22/30