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多层电路板添加平衡铜块的方法和技巧
2019-05-05 Information source: Tengchuangda

 1.  单个PCB平面层中尺寸超出3000mil X 3000mil或1000mil X 5000 mil的

区域。    

    2.对于Gnd层半数或以上层数图形内含有1″*2″或0.5″*5″的基材区;

    3.对于Gnd层半数或以上层数图形内含有靠近铣槽位(或与铣槽相连),且面积超过1″*1″,凡满足 ①ML排板结构中含单张P片;②内层含铜≥2OZ;任意一个条件的基材区 

平衡铜块添加方法

   1. PCB 面板上PCB区域(不包PCB装配用工艺边)外铜平衡块由各制造厂家根据自身工艺添加,一般不作规定。 

    2.对于无特殊要求的PCB装配工艺边Shape的添加可由PCB制造厂家进行添加,但对于由特殊测试或装配要求的工艺边,EDA设计部应当根据规则直接添加在PCB中。

    3.考虑到设计的多样性,EDA设计部可采用下列规则范围的形状和尺寸: 

    1)设计者对外层可以添加铜电镀平衡块,要求采用40mil的方形或圆形,间距60mil,中心距离100mil。保持同普通数字信号200mil以上距离,距离高压电源(12V+)或大电流区域(1A以上)600mil以上.具体边缘500mil以上。 

   2)内层添加阻流块。采用40mil的方形或圆形,心距离100mil,上下可采用半距离间隔保持同普通数字信号100mil以上距离,距离电源(12V+)或大电流区域(1A以上)400mil以,距离边缘400mil以上. 

   4)对于严格不许可厂家添加平衡块的区域应在制造图上单独标注出。 

   5)对于H方向不对称的PCB,为改善均衡性,对于大面积基材区域可以采用更大尺寸的Shape。 


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