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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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LTC4008 датащи(PDF) 21 Page - Linear Technology |
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LTC4008 датащи(HTML) 21 Page - Linear Technology |
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21 / 24 page  21 LTC4008 4008fa APPLICATIO S I FOR ATIO PCB Layout Considerations (cont.) 7. Connection of switching ground to system ground or internal ground plane should be single point. If the system has an internal system ground plane, a good way to do this is to cluster vias into a single star point to make the connection. 8. Route analog ground as a trace tied back to IC ground (analog ground pin if present) before connecting to any other ground. Avoid using the system ground plane. CAD trick: make analog ground a separate ground net and use a 0 Ω resistor to tie analog ground to system ground. 9. A good rule of thumb for via count for a given high current path is to use 0.5A per via. Be consistent. 10. If possible, place all the parts listed above on the same PCB layer. 11. Copper fills or pours are good for all power connec- tions except as noted above in Rule 3. You can also use copper planes on multiple layers in parallel too—this helps with thermal management and lower trace in- ductance improving EMI performance further. 12. For best current programming accuracy provide a Kelvin connection from RSENSE to CSP and BAT. See Figure 12 as an example. It is important to keep the parasitic capacitance on the RT, CSP and BAT pins to a minimum. The traces connecting these pins to their respective resistors should be as short as possible. |
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