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一旦发生系统故障,例如当连接VOUT引脚的负载与GND短路时,过流保护功能会限制输出电流,以保护负载开关IC和使用它的系统。当输出电压(VOUT)下降导致电流过大时,东芝的负载开关IC通过触发限流电路,将输出电流限制在设定的输出限制电流(ICL)电平。当VOUT进一步下降时,东芝的负载开关IC会执行称为折返的电流限制。如果过大的电流高于内部阈值,当输出电压(VOUT)降低时,折返会降低输出电流(IOUT)。即使输出电压为零,短路电流(ISC)也会按内部设置的电平继续流动。“折返”一词源自保护操作期间折返的输出电流(IOUT)与输出电压(VOUT)的曲线形状。当导致过电流的故障条件消失时,负载开关IC会自动从过流保护中恢复,使输出电压恢复至正常电平。
以下链接还提供了过电流保护的说明:
应用说明:Basics of Load Switch ICs
应用说明:Overcurrent Protection and Reverse Current Blocking of the Load Switch IC