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)
1 I0 h+ `: M1 b( Y6 k  S' cThe withstand current of 1 square copper wire is 5 -- 8A, 380V can
be brought with maximum 4KW, 220V can be maximum 2KW.
2 square? Three square meters can be pushed like that
4 ]% ^6 ~4 g, }( MPCB line width and current relationship
) `6 v# e& W, C# Q( ~4 _& d  i2 E: [4 Q" nI. 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
is not certain). The width of the PCB is the
cross-sectional area. There is an experience value of current
8 U6 k% T8 p7 d6 ddensity for 15 ~ 25 amperes per square millimeter. We can just call it
the area where we get the volume.
I = KT0.44 A0.75 (K is the correction factor, which is 0.024 in the
inner layer of the copper line, and 0.048 in the outer layer)
T to the maximum temperature rise, the unit for degrees Celsius
3 ?+ G/ L0 i( g3 L% U/ f% N(copper melting point is 1060 ?)
A to cover the area of copper, the unit is square MIL (not mm mm,
the attention is square MIL.)
I is the maximum allowable current, the unit is ampere (amp).
The 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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