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AN3959 Datasheet(PDF) 36 Page - STMicroelectronics

Part # AN3959
Description  The purpose of this application note is to describe
PDF  65 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN3959 Datasheet(HTML) 36 Page - STMicroelectronics

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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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