Patent ID: 6483370
Filing Date: 2002-11-19
Classification: H03K

Abstract:
A integrated circuit for controlling the on-off switching of a power MOS transistor in conjunction with the detection of an external load, comprising a detection circuit configured to detect the presence of the external load, the detection circuit comprising filtering means for delaying a time of taking the detection into account during the occurrence of a turn-on control signal to the power transistor, the detection circuit further comprising means for controlling a time constant of the filtering means to be dependent on an on-off switching time of the power MOS transistor, wherein the switching times of the power MOS transistor are parameterized by the charge and discharge of a first capacitor by a first constant current source, and further wherein said filtering means include a second constant current source for discharging a filtering capacitor, the value of the constant current of the second source being proportional to the value of the constant current of the first source.