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芯片大电流管脚的问题

Other Parts Discussed in Thread: TPS5430, TPS54540

一个小疑惑,芯片比如tps5430,有3A电流输出,可管脚间距只有1mm多,也就是引出的track局部不会超过1mm,之后当然可以加宽,按经验,1盎司的铜,1mm宽,能通过1A的电流,这是问题吗?