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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ACT8740 датащи(PDF) 25 Page - Active-Semi, Inc |
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ACT8740 датащи(HTML) 25 Page - Active-Semi, Inc |
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25 / 40 page  WLED BIAS DC/DC CONVERTER ACT8740 Rev PrB, 25-Feb-08 Innovative Products. Active Solutions. - 25 - www.active-semi.com Copyright © 2008 Active-Semi, Inc. ActivePMU TM is a trademark of Active-Semi. I 2CTM is a trademark of Philips Electronics. adjusted using the ACT8740’s Direct-PWM fea- ture. REG2 is also compatible with a variety of well-known LED dimming circuits, such as with a DC control voltage and a filtered PWM signal. PCB Layout Considerations High switching frequencies and large peak currents make PC board layout a very important part of the design. Good design minimizes excessive EMI on the feedback paths and voltage gradients in the ground plane, both of which can result in instability or regulation errors. Step-up DC/DCs exhibit con- tinuous input current, so there is some amount of flexibility in placing vias in the input capacitor circuit. The inductor, input filter capacitor, rectifier, and out- put filter capacitor should be connected as close together as possible, with short, direct, and wide traces. Connect the ground nodes together in a star configuration, with a direct connection to the ex- posed pad. Finally, the exposed pad should be di- rectly connected to the backside ground plane us- ing multiple vias to achieve low electrical and ther- mal resistance. Note that since the LED string is a low, DC-current path, it does not generally require special layout consideration. |
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