Patent ID: 6538480
Filing Date: 2003-03-25
Classification: H03K

Abstract:
A load driving device including a power switch element, whose source is connected to a ground terminal, for driving a load and a control circuit for controlling the power switch element according to a signal supplied from an input terminal, the power switch element and the control circuit being provided on one chip, wherein the control circuit comprises:a first resistor connected between a gate of the power switch element and the input terminal; a series circuit of a gate voltage detecting element and a current detecting element, the series circuit being connected between the gate and the source of the power switch element; and an OFF-time delaying circuit for outputting an output signal obtained by delaying only an OFF-time transition of an input signal level of the power switch element, and driving the gate voltage detecting element according to the output signal; wherein the current detecting element monitors a voltage between a drain terminal and the ground terminal and turns ON when the voltage exceeds a threshold value.