SWITCHING REGULATOR

摘要

A switching regulator includes a load determination circuit. The load determination circuit feeds, to an offset voltage generation circuit, a different load determination signal at the time of light load or at the time of heavy load. The offset voltage generation circuit applies an offset voltage corresponding to whether a load is light or heavy to the inverting input terminal of a PWM comparator to acquire the responsiveness and the stability of the switching regulator.

主权项

1. A switching regulator comprising:
a first switching transistor to which an input voltage is fed and which performs an on/off switching operation; a second switching transistor which performs an on/off operation complementarily with the first switching transistor; a driver which generates a first drive pulse and a second drive pulse that respectively drive the first switching transistor and the second switching transistor in synchronization with a clock signal; a PWM comparator which adjusts a pulse width of the first drive pulse and the second drive pulse to feed a pulse width modulation signal to the driver; a reverse current detection circuit which detects a current flowing through the second switching transistor; a load determination circuit which is controlled by an output of the reverse current detection circuit; and an offset voltage generation circuit which is controlled by an output of the load determination circuit to correct a potential of one input terminal of the PWM comparator.