Power supply circuits are critical components in all electrical systems. They not only supply power but must also do so without degrading system performance with noise and/or sagging supply voltages, which is why the layout of the PCB is extremely important. Key power supply specifications like output voltage accuracy and power efficiency worsen when the layout of PCB is less then optimal, since the effects of parasitic PCB resistances and inductances are considerably high for high-current, fast-switching traces.
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Tech Analog Application Note download PDF