© 2012 Fairchild Semiconductor Corporation
15
FEBFL7730_L20H008A • Rev. 0.0.2
Figure 20. Dimming Operation Waveforms –
Min.
Dimming Angle, V
IN
[220V
AC
], C1 [V
IN
], C2 [V
CS
], C4 [I
IN
]
Output current is controlled by dimming function when rotating dimmer switch as in the
dimming curve in Figure 21. The dimming control block in FL7730 smoothly changes
regulated output current by detecting dimming angle.
Figure 21.
Dimming Curve (Effective RMS Input Voltage vs. Output Current) – Line Voltage [220V
AC
]
