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ACT8310NHADJ-T Datasheet(PDF) 7 Page - Active-Semi, Inc |
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ACT8310NHADJ-T Datasheet(HTML) 7 Page - Active-Semi, Inc |
7 / 11 page ACT8309/8310/8311 Rev 1, 15-Nov-12 Innovative Power TM - 7 - www.active-semi.com Copyright © 2012 Active-Semi, Inc. a logic-level “Power-OK” signal, simply connect a pull- up resistor from POK to an appropriate output volt- age. PCB Layout Considerations High switching frequencies and large peak current make PC board layout an important part of step- down DC/DC converter design. A good design mini- mizes excessive EMI on the feedback paths and volt- age gradients in the ground plane, both of which can result in instability or regulation errors. Step-down DC/DCs exhibit discontinuous input current, so the input capacitors should be placed as close as possi- ble to the IC, and avoiding the use of vias if possible. The inductor, input filter capacitor, and output filter capacitor should be connected as close together as possible, with short, direct, and wide traces. The ground nodes for each regulator’s power loop should be connected at a single point in a star-ground con- figuration, and this point should be connected to the backside ground plane with multiple vias. For fixed output voltage options the output node for each regu- lator should be connected to its corresponding FB pin through the shortest possible route, while keeping sufficient distance from switching nodes to prevent noise injection. Adjustable output versions should follow the same guidelines, but additionally connect the feedback resistors to the FB pin as close to the IC as possible to minimize noise injection. |
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