ACT6330
WLED BIAS DC/DC CONVERTER (REG1)
Setting the LED Bias Current
The LED bias current is set by a resistor connected
from FB1 and ground, and regulator is satisfied
when the LED current is sufficient to generate
250mV across this resistor. Once the bias current is
programmed, the LED current can be adjusted us-
ing the ACT6330’s Direct-PWM feature. REG1 is
also compatible with a variety of well-know LED
dimming circuit, such as with a DC control voltage
and a filtered PWM signal.
Rev0, 02-Apr-08
Board Layout
Typical for all switching power supplies, the layout
is an important step in design, especially at high
peak current and switching frequencies, please re-
fer to
PCB Layout Consideration
for more informa-
tion.
Innovative Power
TM
ActivePMU
TM
-8-
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