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LMR16030: 为什么电压下降至17.5V关断了,启动点在17.8V,而不是在20.8V

Part Number: LMR16030

Vstart=20.8V

Vstop=17.7V

         低于17.1V后,启动电压为20.8V

         V≥17.2时,17.8V能启动

         16030启动电压,关断电压调整

         RENT=820K

         RENB=48.7K

我用的直流源加电压测试的,为什么电压下降至17.5V关断了,启动点在17.8V,而不是在20.8V