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LM5576做的-18VDC1A的电源,在设计关断电路时出现问题

Other Parts Discussed in Thread: LM5576

LM5576的2脚用作关断使能信号端,通过两个电阻(24VDC经R607  R606进行分压,R607=5.1K,R606=1K)对输入电压进行分压为2(SD)脚提供电压信号。输入电压为24V时,2脚到地的电压为什么为-1.16VDC