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TPS54426 FB引脚测量

Other Parts Discussed in Thread: TPS54426

上图是tps54426的原理图,加电后输出3.3v正常,但是在电路板上测试芯片2脚时的电压输出电压就变为0V了,2脚电压也是0v,就是2脚对测量非常敏感,用手触摸一下也会没有输出,请问这个问题是不是正常现象,产品在使用过程中会不会因为电磁干扰、雷雨之类的影响,导致芯片突然不工作了。盼复,谢谢!困扰很久了。