Monday, December 27, 2010

Weak current College】 【PCB design time copper foil thickness, width and alignment of the current relationship between】.

<br> (A) I'm in a PDF document inside to see, as differing thickness of copper foil of different width contains the flow shown in the following table: <br> Copper skin thickness 35um copper skin thickness 50um 70um copper skin thickness .<br> Copper Peel t = 10 t = 10 copper Peel tongpi t = 10 mm for current A width mm width of current A current A width mm <br> 6.00 2.50 5.10 2.50 4.50 2.50 <br> 5.10 2.00 4.30 2.00 4.00 2.00 < .br> 4.20 1.50 3.50 1.50 3.20 1.50 <br> 3.60 1.20 3.00 1.20 2.70 1.20 <br> 3.20 1.00 2.60 1.00 2.30 1.00 <br> 2.80 0.80 2.40 0.80 2.00 0.80 <br> 2.30 0.60 1.90 0.60 1.60 0.60 <br> 2.00 0.50 1.70 .0.50 1.35 0.50 <br> 1.70 0.40 1.35 0.40 1.10 0.40 <br> 1.30 0.30 1.10 0.30 0.80 0.30 <br> 0.90 0.20 0.70 0.20 0.55 0.20 <br> 0.70 0.15 0.50 0.15 0.20 0.15 Note 1 bronze skin for wire when using high current carrying .capacity of copper foil width should refer to the table of numeric Derating 50% off select consider another look from <<electronic circuit interference practical technology>> (defense industry press, wool Nan Sunying 96.1 first edition) experience formula, .following the original extract: <br> "Due to the limited application of copper foil thickness, in need through the larger currents of strips of copper foil, consideration should be given to the current issue of copper foil. The typical case of 0.03mm thickness ., if copper foil as wide as the W (mm), length L (mm) of the strip line, its resistance to 0.0005 * L / W ohm. In addition, copper current also and printed circuit board components installation on a number of species ., as well as thermal conditions. Having regard to the safety of the General can experience formula 0.15 * W (A) to calculate the current carrying capacity of copper foil. Ps-ef | grep wcz <br> Ps-e | grep allegro ( .2) in electronic engineering album Forum see PCB PCB copper skin width and the flow through the current size of <? xml: namespace prefix = "o" ns = "urn: schemas-microsoft-com: office: office"?> calculation methods .<o:p> </ o: p> <b style="mso-bidi-font-weight: normal"> <o:p> </ o: p> General PCB copper foil thickness 35um, <? xml: namespace .prefix = "st1" ns = "urn: schemas-microsoft-com: office: smarttags"?> line width is <st1: chmetcnv unitname = "mm" sourcevalue = "1" hasspace = "False" negative = "False" numbertype .= "1" tcsc = "0" w: st = "on"> 1mm </ st1: chmetcnv>, then the line cross-section area of 0.035 sq mm, usually take <st1: chmetcnv unitname = "a" sourcevalue = ."30" hasspace = "False" negative = "False" numbertype = "1" tcsc = "0" w: st = "on"> 30A </ st1: chmetcnv> current density/mm2, therefore, each mm line width can .<st1:chmetcnv unitname="a" sourcevalue="1" hasspace="False" negative="False" numbertype="1" tcsc="0" w:st="on"> 1A </ st1: chmetcnv> current .flows through. <o:p> </ o: p> <o:p> </ o: p> IPC275-A standard calculation formula is on the rise, with copper foil thickness, A relevant. <o:p> < ./ o: p> <o:p> </ o: p> I = 0.0150 (DT 0.5453) (A 0.7349) for Internal Traces <o:p> </ o: p> IPC-D-275 <o: p .> </ o: p> I = 0.0647 (DT 0.4281) (A 0.6732) for External Traces <o:p> </ o: p> IPC-D-275 IPC275-A standards not found. </ b>.

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