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LM73605: 电源芯片开关频率咨询

Part Number: LM73605

调试LM73605功能,输入12V,想要输出5v,上电一测,输出依然是12V,SW的开关频率是170-190khz。我看手册最小都是350khz。请问这个是什么问题导致?

我将RT悬空,按照手册接115k,39.1k,开关频率都没有变化。

请专家指导下,把把脉,