Timeline for What is the advantage of using polygonal copper pours over straight traces in buck converter PCB design?
Current License: CC BY-SA 4.0
9 events
| when toggle format | what | by | license | comment | |
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| Apr 3 at 13:39 | comment | added | Lundin | I'm far from a regulator layout person, but how to tell the EDA tool where to connect the regulator ground to the common ground in a sensible way seems to be a very common, recurring problem. I've seen all manner of dirty hacks to solve this, like zero ohm resistors and the like. | |
| Apr 3 at 13:39 | comment | added | Tom Carpenter | @lemon, which EDA package are you using? | |
| Apr 3 at 6:22 | comment | added | winny | I try to help mine by retracting the ground plane from the area and experimenting a bit with the polygon pours before committing to a reasonable layout. I aim for no overlap and the only priority needed is to pour ground last. | |
| Apr 3 at 6:14 | comment | added | lemon | My EDA doesn't like it when there are multiple zones, all of different nets on the same layer(assigning priority levels is a big pain, the DRC goes absolutely crazy) within a no-fill zone. I could remove the global ground and power planes, but there is no way for me to separate the power coming from the buck converter and the global +5V pour. | |
| Apr 3 at 6:01 | comment | added | winny | Move down to 0603 or 0402 if you can. Thicker traces help, but why are you reluctant to use polygons? | |
| Apr 3 at 4:18 | comment | added | 比尔盖子 | @lemon By switching loop, it means the closed path from the switching node, to output capacitor, to capacitor ground, and to converter's ground pin. It's important to realize that inductance is not a property of "inductors", instead, it comes from the magnetic field around closed loops. Thus, (1) all closed loops have inductance. Furthermore, the inductance of a circuit is (2) positively correlated to the enclosed loop area. Thus, to minimize parasitic inductance, the power and ground must be very close to each other, and the best way is to use solid copper pours and ground planes. | |
| Apr 2 at 23:49 | comment | added | lemon | Yes, most of my resistors and capacitors are 0805. What do you mean by 'switching loop', and would significantly thicker traces(1mm vs 0.3mm I used earlier) work? | |
| Apr 2 at 14:30 | comment | added | MOSFET | And better heat removal. | |
| Apr 2 at 8:47 | history | answered | winny | CC BY-SA 4.0 |