PCB线宽与电流（PCB line width and current）

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PCB 线宽与电流(PCB line width and current)
$ z: T$ ]; X5 X) QThe withstand current of 1 square copper wire is 5 -- 8A, 380V can
be brought with maximum 4KW, 220V can be maximum 2KW.
+ E8 _( v$ G: t2 square? Three square meters can be pushed like that
  ]+ m2 q* S% b1 v: R8 c! M% E7 NPCB line width and current relationship
I. calculation method is as follows:
First, the section area of Track is calculated. The copper foil
thickness of most PCB is 35um (the PCB manufacturer can be asked if it
0 r/ k" i* n# O+ N* I! g, @. Mis not certain). The width of the PCB is the
4 h* ~9 ^" C6 h3 @. A- ucross-sectional area. There is an experience value of current
" ?# w+ G# k( \/ z4 `density for 15 ~ 25 amperes per square millimeter. We can just call it
3 X. v8 n5 `; d: A/ C  Gthe area where we get the volume.
I = KT0.44 A0.75 (K is the correction factor, which is 0.024 in the
' k* D& o7 h3 C. g, M+ O( t6 C. b1 sinner layer of the copper line, and 0.048 in the outer layer)
) K# f$ _: Z! P9 V. ST to the maximum temperature rise, the unit for degrees Celsius
- W, @. I3 s6 {0 k(copper melting point is 1060 ?)
A to cover the area of copper, the unit is square MIL (not mm mm,
: R+ \2 Q- U6 j' [9 q. fthe attention is square MIL.)
I is the maximum allowable current, the unit is ampere (amp).
8 \3 g( v7 P. Z3 T4 dThe average 10mil = 0.010 inch = 0.254 May be 1A, 250MIL = 6.35mm,
which is 8.3 A  

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PCB线宽与电流

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学习一下，谢谢。
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