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LM3478降压问题

Other Parts Discussed in Thread: LM3478, TPS54202

lm3478.pdf 看到了一个LM3478芯片的降压电路,但是芯片的外围电路有点看不懂,特别是1脚(Isen),按照datasheet应当一直处于短路保护状态(Isen电压已经远远超过343mV),为什么还能正常工作?