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我们的eFuse IC提供两种过流恢复选项:自动重试型和锁存型。
用户可根据系统要求从两种选项中选择合适的类型。下图展示了TCKE8系列自动重试型和锁存型的时序图示例。更多详情请参阅数据表。
自动重试型
当电流超过过流限制ILIM时,通过ILIM限制流经eFuse IC并进入内部MOSFET的电流。
此时,eFuse IC产生功耗PD=(VIN-VOUT) ×ILIM,结温升高,从而进入热关断操作并关断MOSFET。
MOSFET关断后,结温降低,随后MOSFET再次导通。如果过流情况未解决,ILIM会限流,然后再次执行热关断操作。(图1)
锁存型
与自动重试型一样,当发生过流时,通过ILIM确定的电流限制流经MOSFET的电流后,eFuse IC进入热关断模式并关断MOSFET。锁存型使MOSFET保持关断状态。
如欲解除锁存状态,当过流状态解除后,将EN/UVLO引脚的电压设为低电平,然后再将其设为高电平。(图2)
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