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AN3959 Datasheet(PDF) 36 Page - STMicroelectronics |
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AN3959 Datasheet(HTML) 36 Page - STMicroelectronics |
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36 / 65 page ![]() Design guidelines for schematic and PCB layout AN3959 36/65 Doc ID 022081 Rev 3 Figure 41. Coils separated in order to avoid crosstalk Figure 42. VCC filter for high frequency Placing the VCC filter capacitors close to the pins avoids an inductive coil generated by the copper wire, because the system is working in PWM with fast switching (the frequency is 384 kHz with fs = 48 kHz) so the longer copper wire easily becomes an inductor. To improve this we suggest using the ceramic capacitor to balance the reactance. It's mandatory to put the ceramic capacitor as close as possible to the related pins. The distance between the capacitor to the related pins is recommended to be within 5 mm. |
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