Switching regulator control circuit and switching regulator
View Patent ↗Provided is a switching regulator configured to achieve a 100% Duty state and reduce an occurrence of an overshoot. The switching regulator has a configuration in which a clamp circuit configured to dynamically generate a clamp level clamps an output voltage of an error amplifier in accordance with a peak value of a triangular wave signal.
1. A switching regulator control circuit configured to control an output transistor connected to an output terminal, to thereby output a predetermined voltage, the switching regulator control circuit comprising:
a triangular wave generating circuit configured to generate a triangular wave;
an error amplifier configured to compare a reference voltage and a voltage based on an output voltage;
a comparator configured to compare a signal based on the triangular wave and an output signal of the error amplifier;
a peak hold circuit configured to hold a voltage obtained by adding an offset voltage to an upper limit voltage of the signal based on the triangular wave; and
a clamp circuit configured to clamp an output terminal of the error amplifier based on a voltage output from the peak hold circuit.
2. A switching regulator control circuit according to claim 1 , wherein the signal based on the triangular wave comprises a signal obtained through addition of a current signal component based on a current flowing through the output transistor.
3. A switching regulator, comprising:
the switching regulator control circuit according to claim 1 ; and
an output circuit comprising an output transistor connected to an output terminal of the switching regulator control circuit.
4. A switching regulator, comprising:
the switching regulator control circuit according to claim 2 ; and
an output circuit comprising an output transistor connected to an output terminal of the switching regulator control circuit.