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LM3478: FA/SD引脚电流

Part Number: LM3478


你好,LM3478 datasheet的page 6 参数表格里的FA/SD引脚电流在SD=0时,引脚电流为1uA,而我在使用的时候,SD=0的时候,引脚电流为380uA,我的测试条件是VIN=12V,SD=0,PGND=AGND=0,其他引脚悬空.请问是为什么呢?