ICL8001G / ICLS8082G
Design Guidelines
Design Optimizations
Application Note
16
Version 2.0, 2011-04-14
Phase cut dimming arrangement
Figure 9
Phase cut dimming arrangement
The experimental dependence PLED(Vrms) is illustrated using a 40 Weq LED bulb driver controlled with a trailing
edge phase cut dimmer.
Figure 10
Output power versus input trail edge Vrms
Effective for the application is the dependence of the LED driver power on the switching instant ts / switching angle.
The following experimental diagram obtained with an Ehmann trailing edge dimmer shows the dependence of the
switching instant ts on the driver input power (upper curve) and LED power (lower curve) respectively.
Figure 11
Relationship between switch-off instant ts and power
Phase Cut Dimmer
ICL8001G
LED Driver
LED Array
Vac
+
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Vac
VLED
+
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