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L7292 データシート(PDF) 52 Page - STMicroelectronics |
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L7292 データシート(HTML) 52 Page - STMicroelectronics |
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52 / 60 page  PCB design rules guideline L7292 52/60 DocID028601 Rev 1 13.2.1 Supplies An incoming supply per switcher should be adequately buffered using an input capacitor. Refer to the device specification for suggested values. This capacitor needs to be placed as close as possible to the VIN pin to minimize the loop area. 13.2.2 Switch node The switch node is the pin feeding the inductor. Keep the switch node as short as possible to avoid power losses. Do not make it wider than necessary to avoid capacitive loading of the switch node. 13.2.3 Feedback node The feedback node is a high impedance input and thus sensitive to noise and current injection through the capacitive and magnetic coupling. Keep the feedback lines away from large switching surfaces or magnetic fields. Remember that magnetic fields are not stopped by copper! Feedback components should be connected to a clean return pathway and never share return paths with the main switching elements. 13.2.4 Output capacitors Multiple output capacitors are preferred over a single one. Each capacitor should have its own return via. |
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