Datasheet

NCL30100
http://onsemi.com
18
Figure 34. Current Through LED if 50% Dimming
at 1 kHz is Applied
Figure 35. The Dimming Detail at 95%. No Overshoot
in LED Current is Observed
Figures 36 and 37 illustrate leading edge and trailing edge
waveforms from a chopped AC source. For proper dimming
control, the bulk capacitance must be reduced to a relatively
small value to achieve best dimming range. Performance in
real world application is dependent on the characteristics of
the actual dimmer and the electronic transformer used to
generated to chopped AC waveform
Figure 36. Trailing Edge Dimming Figure 37. Leading Edge (Triac) Regulation. Small
Overshoot is Seen on the Leading Edge, this is
Based on the Abrupt Chopping of the Low Voltage
AC Waveform