Patent ID: 8687332
Filing Date: 2014-04-01
Classification: H03K,H05B,Y02B

Abstract:
1. A transistor circuit with protecting function, packaged in a single package structure having a first terminal adapted for connection to a load, a second terminal and a control terminal, the transistor circuit comprising: a transistor having a drain end, a source end and a gate end, wherein the drain end is coupled to the first terminal, the source end is coupled to the second terminal and the gate end is coupled to the control terminal; wherein the control terminal controls a state of the transistor by a received switch control signal generated by an external control unit; a voltage detecting unit, arranged in the same package as the transistor circuit, for detecting a voltage drop between the drain end and the source end of the transistor and generating an over-voltage protection signal; and a protecting unit, built in the same package as the transistor circuit, coupled to the control terminal, controlling a state of the transistor according to the over-voltage protection signal; wherein the protecting unit reduces a voltage difference between the control terminal and the second terminal when the voltage drop of the transistor is higher than a first preset voltage, such that a current flowing through the transistor is decreased or decreased to zero.