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LM5021: LM5021打嗝模式的困惑

Part Number: LM5021

 你好,LM5021过流检测COM PIN电压为4.6V,datasheet中给出IC对应的最大占空比所对应的COM电压为2.75V.是否意味着进入打嗝时保护模式时,占空比是被限制在最大占空比80%?要进入打嗝保护,几乎相当于进入短路模式?或者说短路模模式下,才能进入打嗝保护?