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AN4569 Datasheet(PDF) 21 Page - STMicroelectronics

Part # AN4569
Description  The purpose of the document is to show different possibilities
PDF  29 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN4569 Datasheet(HTML) 21 Page - STMicroelectronics

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DocID026803 Rev 1
21/29
AN4569
Layout
29
4
Layout
4.1
Decoupling
Use electrolytic capacitors first to separate the Vcc branches;
Figure 19. Electrolytic capacitor
Minimize the path between the Vcc pins and ground pin in order to avoid inductive
paths;
Figure 20. VCC - GND paths
Vcc routing. The purpose of a "star routing" for the Vcc supply is in order to avoid the
interference between different signals such as part A idle and another part B working
with full load. Under this condition the interference would evidently happen if no star
connection were implemented.
Figure 21. Star connection



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