Patent ID: 6801058
Filing Date: 2004-10-05
Classification: H03F

Abstract:
A circuit for sensing and controlling current, comprising:a power output stage; an over-current sense circuit; a reverse recovery sense circuit to monitor a reverse recovery period of a body diode including an input at a first voltage sensing node and an output, the first voltage sensing node being adapted to sense a voltage spike to monitor a reverse recovery period of a body diode; a logic detection circuit having a first input, a second input and an output, the first input being responsively coupled to the over-current sense circuit and the second input being responsively coupled to the reverse recovery sense circuit; the reverse recovery sense circuit being operable to disable the power output stage when a voltage spike occurs during the reverse recovery period; the reverse recovery sense circuit being adapted to output a first logic signal when a voltage spike event is occurring during the reverse recovery period and a second logic signal when a voltage spike event is not occurring; and the logic detection circuit being operable to reduce the current through the power output stage when an over-current event is occurring and a voltage spike event is not occurring.