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LM2596 输出负电压,散热焊盘连接问题

请问下贴片 LM2596S的金属散热焊盘内部是否跟3号引脚GND连接?还是只是用于散热。因为手头上没有元器件。所以在设计伏电压时不知该跟输出相连还是跟GND相连?