CONTROL CIRCUIT FOR SWITCHING POWER SUPPLY

摘要

A power supply circuit is configured including a control circuit together with an output circuit including an external circuit component. A switching controller controls a switching transistor and a synchronous rectification transistor each configured as a switching element. A degradation detection circuit monitors a detection signal having a correlation with characteristic degradation of the circuit component, and detects the degree of characteristic degradation of the circuit component. The switching controller is capable of changing its operation according to the degree of characteristic degradation of the circuit component.

主权项

1. A control circuit that forms a switching power supply together with an output circuit comprising an external circuit component, the control circuit comprising:
a switching controller that controls a switching element of the switching power supply; and a degradation detection circuit that monitors a detection signal having a correlation with characteristic degradation of the external circuit component so as to detect a degree of characteristic degradation of the external circuit component, wherein the switching controller changes its operation according to the degree of characteristic degradation of the external circuit component.