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WM8326 Datasheet(PDF) 252 Page - Wolfson Microelectronics plc |
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WM8326 Datasheet(HTML) 252 Page - Wolfson Microelectronics plc |
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252 / 255 page  WM8326 Production Data w PD, June 2012, Rev 4.0 252 30.5 PCB LAYOUT Poor PCB layout will degrade the performance and be a contributory factor in EMI, ground bounce and resistive voltage losses. Poor regulation and instability can result. Simple design rules can be implemented to negate these effects: External input and output capacitors should be placed as close to the device as possible using short wide traces between the external power components. For the DC-DC Converters, the input capacitor placement takes priority on the DC-DC converters. (For the LDO Regulators, the placement of the input and output capacitors have equal priority.) Route the DC-DC converter output voltage feedback as an independent connection to the top of the output capacitor to create a true sense of the output voltage, routing away from noisy signals such as the LX connection. Use a local ground island for each individual DC-DC converter connected at a single point onto a fully flooded ground plane. Current loop areas should be kept as small as possible with loop areas changing little during alternating switching cycles. |
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