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Semiconductor switching device with a multi-source power FET having a sense current path allowing a predetermined number of reconnection attempts before shutdown
Semiconductor switching device with a multi-source power FET having a sense current path allowing a predetermined number of reconnection attempts before shutdown
A reference current (Iref) that includes a constant component current (Irefc) and a transient component current (Ireft) is fed to the reference FET (QB) such that a source potential (VSA) of the main FET (QA) when a load current (ID) flowing a main FET (QA) is not within the range of an over-current containing a transient component is not lower than a source potential (VSB) of a reference FET (QB). A reference current (Iref) vibrates by detecting that a source potential (VSA) of the main FET is lower than a source potential (VSB) of a reference FET. A vibration number of times is counted up to a predetermined number of times, thereby turning OFF the main FET (QA).
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