Importance

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Abstract

A switching power supply includes a transformer, a switching element connected to the primary-side winding, a power control semiconductor device that outputs a signal for performing ON/OFF control of the switching element, and a current-voltage conversion element connected to the switching element. The semiconductor device includes: a first terminal that receives a voltage/current corresponding to an output from the secondary side of the transformer; a second terminal that receives the voltage converted by the current-voltage conversion element; a period signal generation circuit that generates a signal for periodically turning on the switching element; a current detection circuit that generates a signal for turning off the switching element, based on a voltage/current at the first terminal and a voltage at the second terminal; and a complementary current circuit that outputs a complementary current to the second terminal. A complementary resistor is provided between the second terminal and the current-voltage conversion element.

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First Claim