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tps51116电源问题

Other Parts Discussed in Thread: TPS51116, TPS51116EVM-001

我用tps51116芯片给DDR3供电,s3 s5直接用100K的电阻上拉,输出1.5V正常,但是S3 S5引脚用外部PGRGOOD信号控制,上拉电阻测量只有1K多,测量芯片的输出电压只有0.5V左右,这种情况会是什么问题导致的呢?