Datasheet

© 2012 Fairchild Semiconductor Corporation 10 FEBFL7701_L30U003A • Rev. 1.0.2
8. Test Waveforms
8.1. Typical Waveforms: Startup
Figure 8 through Figure 11 show the typical startup performance at different input
voltage conditions. When AC input voltage is applied to the system, the FL7701
automatically operates in AC Mode after finishing an internally fixed, seven-cycle, soft-
start period. Figure 10 and Figure 11 show the soft-start characteristics when a DC input
voltage is applied.
CH1: V
CC
, CH2:
V
DRAIN
, CH3: V
LED
, CH4: I
LED
Figure 8. Soft-Start Characteristics, AC Mode, 90V
AC
CH1: V
CC
, CH2:
V
DRAIN
, CH3: V
LED
, CH4: I
LED
Figure 9. Soft-Start Characteristics, AC Mode, 265V
AC
CH1: V
CC
, CH2:
V
DRAIN
, CH3: V
LED
, CH4: I
LED
Figure 10. Soft-Start Characteristics, DC Mode, 100V
DC
CH1: V
CC
, CH2:
V
DRAIN
, CH3: V
LED
, CH4: I
LED
Figure 11. Soft-Start Characteristics, DC Mode, 200V
DC