ꢀ ꢁꢁꢂ ꢃ ꢄ ꢅ ꢆ ꢀ ꢁ ꢁꢂ ꢃ ꢄ ꢇ ꢆ ꢀꢁ ꢁꢂ ꢃ ꢄ ꢄ
ꢀ ꢁꢁꢈ ꢃ ꢄ ꢅ ꢆ ꢀ ꢁ ꢁꢈ ꢃ ꢄ ꢇ ꢆ ꢀꢁ ꢁꢈ ꢃ ꢄ ꢄ
SLUS499A – NOVEMBER 2001 – REVISED JANUARY 2002
TYPICAL WAVEFORMS
V
V
= 12 Vdc
IN
LAMP
= 125 Hz
= 600 V
f
OSC
10% Duty Cycle
= 5 mA
I
LAMP
V
V
OPEN/SD
OPEN/SD
V
COMP
LAMP
V
Figure 23. UCC3976 Externally Controlled Bursting Dimming
at 10% Duty Cycle
V
V
= 12 Vdc
IN
LAMP
= 125 Hz
= 600 V
f
OSC
90% Duty Cycle
= 5 mA
I
LAMP
V
V
OPEN/SD
OPEN/SD
V
COMP
LAMP
V
Figure 24. UCC3976 Externally Controlled Bursting Dimming
at 90% Duty Cycle
26
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