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LMZ31520的PWRGD问题

Other Parts Discussed in Thread: LMZ31520

用LMZ31520设计的12V转1V,现在输出1V正常,实测1.01V,PWRGD引脚为何一直为低?只有0.5V左右,我用的是内部上拉100K,PWRGD_PU引脚接3.3V。

之前用外部上拉100K到3.3V就没问题。知道的能解释下为什么吗?