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ACT6330 Datasheet(PDF) 8 Page - Active-Semi, Inc |
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ACT6330 Datasheet(HTML) 8 Page - Active-Semi, Inc |
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8 / 14 page  ACT6330 Rev0, 02-Apr-08 WLED BIAS DC/DC CONVERTER (REG1) Innovative Power TM - 8 - www.active-semi.com Copyright © 2008 Active-Semi, Inc. ActivePMU TM is a trademark of Active-Semi. 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. 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. |
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