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开关电源GND的问题



     tps543209开关电源SW管脚的走线是不是很重要啊?我在内电层走的SW导线,尽可能的宽,而且绕开芯片区域,但是因为相应层为GND层,这就形成了地线环路,不知道会不会影响电源的性能呢?

     在开关电源布线过程中,多个器件需要单点接地,但是怎么样算是单点接地呢?只打一个过孔就是单点接地吗?