Patent ID: 7170272
Filing Date: 2007-01-30
Classification: H02M,Y02B

Abstract:
1. A semiconductor integrated circuit for controlling power supply, which turns On and Off in a complementary manner a first switching element and a second switching element coupled serially between a voltage input terminal and a reference potential terminal and supplies an electric current to an inductor coupled between a node of connection of the first and second switching elements and an output terminal to convert the voltage applied to the voltage input terminal and outputs the converted voltage, the integrated circuit having: a light load detection circuit for detecting a light load condition; and a reverse current prevention function which, when the detection circuit detects the light load condition, prevents the second switching element from turning On in a period when the second switching element should turn On, wherein, even when the light load detection circuit detects the light load condition, the first and second switching elements are turned On and Off in a complementary manner as many times as prescribed after a detection of the light load condition.