The current detection circuit formed by FET

Published:2011/6/8 21:00:00 Author:leo | Keyword: The current detection circuit formed by FET | From:SeekIC

The picture shows a current detection circuit formed by FET and others. In this circuit, VT1 is the switch. When VT1 is saturated, it will act as current detection resistance.When the current flowing through VT1 is too heavy, the voltage between source and drain will increase. Then the inverter G1 will detect the voltage. And this can make the grid voltage of VT1 lower while the drain voltage increases, which make the whole circuit break away from the steady condition. Under this situation, almost no current flows through load RL. Therefore, VT1 can be regarded as fusible link. Because when the current passing through VT1 is too heavy, VT1 will be burned out and the current flowing through load RL is zero.



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