Kapasidad ng current ng PCB power plane: copper pours, neck-downs at vias
I-size ang PCB power plane mula sa pinakakitid na totoong current window, hindi mula sa total copper area. Magsimula sa load current, finished copper, layer, length, allowed temperature rise at voltage drop, pagkatapos i-audit ang neck-downs, slots, thermal relief, connector, fuse, shunt at vias.
Mahahalagang punto
- •Gamitin ang effective current path width.
- •Neck-downs, antipads, slots, reliefs at connector exits ang madalas na limitasyon.
- •Mas mainit ang inner power planes kaysa outer pours.
- •Voltage drop at copper loss ang madalas unang limitasyon.
- •I-document ang finished copper, minimum width, vias, test current, ambient at allowed drop.
Direktang sizing rule
| Direktang sizing rule | Daloy ng engineering | Checklist sa release | Power plane FAQ |
|---|---|---|---|
| Gamitin ang effective current path width. | Gamit ang pinakakitid na continuous window, finished copper, layer, length, temperature rise at ambient. | Neck-downs, antipads, slots, reliefs at connector exits ang madalas na limitasyon. | Paano kalkulahin ang plane current? |
| Neck-downs, antipads, slots, reliefs at connector exits ang madalas na limitasyon. | Kapag short, wide at continuous lang. | Mas mainit ang inner power planes kaysa outer pours. | Laging mas mabuti ba ang copper pour? |
| Mas mainit ang inner power planes kaysa outer pours. | Hindi sa parehong thermal margin. | Voltage drop at copper loss ang madalas unang limitasyon. | Pareho ba ang inner plane current? |
| Voltage drop at copper loss ang madalas unang limitasyon. | Finished copper, minimum neck, vias, slots, reliefs, test current, temperature at voltage drop. | I-document ang finished copper, minimum width, vias, test current, ambient at allowed drop. | Ano ang dapat i-confirm? |
Daloy ng engineering
- Gamitin ang effective current path width.
- Neck-downs, antipads, slots, reliefs at connector exits ang madalas na limitasyon.
- Mas mainit ang inner power planes kaysa outer pours.
- Voltage drop at copper loss ang madalas unang limitasyon.
- I-document ang finished copper, minimum width, vias, test current, ambient at allowed drop.
- Gamit ang pinakakitid na continuous window, finished copper, layer, length, temperature rise at ambient.
- Kapag short, wide at continuous lang.
Checklist sa release
- Gamitin ang effective current path width.
- Neck-downs, antipads, slots, reliefs at connector exits ang madalas na limitasyon.
- Mas mainit ang inner power planes kaysa outer pours.
- Voltage drop at copper loss ang madalas unang limitasyon.
- I-document ang finished copper, minimum width, vias, test current, ambient at allowed drop.
- Hindi sa parehong thermal margin.
- Finished copper, minimum neck, vias, slots, reliefs, test current, temperature at voltage drop.
Karaniwang bitag
Inirerekomendang internal tools
Power plane FAQ
Paano kalkulahin ang plane current?
Laging mas mabuti ba ang copper pour?
Pareho ba ang inner plane current?
Ano ang dapat i-confirm?
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Mabilis na FAQ
Paano kalkulahin ang plane current?
Gamit ang pinakakitid na continuous window, finished copper, layer, length, temperature rise at ambient.
Laging mas mabuti ba ang copper pour?
Kapag short, wide at continuous lang.
Pareho ba ang inner plane current?
Hindi sa parehong thermal margin.
Ano ang dapat i-confirm?
Finished copper, minimum neck, vias, slots, reliefs, test current, temperature at voltage drop.
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