Patent ID: 6343025
Filing Date: 2002-01-29
Classification: H02M

Abstract:
A switching converter for generating a driving signal by using an oscillation signal through oscillation driving means and switching a transistor in response to said driving signal to obtain a desirable DC output voltage, comprising:overload detecting means for detecting an overload state and outputting a non-control detection discrimination signal; soft start control means for controlling the frequency of said oscillation signal of said oscillation driving means in a soft start period which is a predetermined period and starts at starting-up, thereby carrying out a soft start operation for raising gradually said DC output voltage to a desirable voltage level; comparing means for comparing said non-control detection discrimination signal and said soft start period signal to produce a non-control detection signal based on said comparison; and oscillation driving control means for controlling said oscillation driving means based on said non-control detection signal to stop said driving signal, thereby making said non-control detection discrimination signal invalid during said soft start operation and preventing shut down of the converter.