DC-DC converter

摘要

A DC-DC converter includes a high-side circuit supplied with a power supply voltage and a first internal reference voltage generated by a first regulator. The high-side circuit provides a current to an inductor, which is used for generating an output voltage. The first and second regulators each generate respective internal reference voltages. The second internal reference voltage is provided to a signal processing module, which controls the high side circuit so that the output voltage of the DC-DC converter corresponds to regulated target voltage level. The first and second regulators include a differential circuit comparing voltages and generating a corresponding comparison signal, a transistor for generating the internal reference voltage according to a gate voltage applied to its gate, and a circuit to change the gate voltage to reduce a signal amplitude of the comparison signal.

主权项

1. A control circuit, comprising:
a first circuit supplied with a first internal reference voltage and a first power supply voltage and configured to supply current to an output terminal; a first regulator configured to generate the first internal reference voltage; and a second regulator configured to generate a second internal reference voltage, wherein the first regulator and the second regulator each comprise: a differential circuit configured to generate a comparison signal corresponding to a voltage difference between a prescribed reference voltage and a control voltage that is correlated to one of the first internal reference voltage and the second internal reference voltage; a first current source supplying current to the differential circuit; a first current mirror circuit connected to first and second differential output lines, each of which is connected to the differential circuit; a first transistor that outputs the first internal reference voltage based on the comparison signal or the second internal reference voltage based on the comparison signal; a first capacitor; a second transistor configured to control charge and discharge of the first capacitor and to control current flowing to the first differential output line and a gate voltage of the first transistor based on the control voltage; and a second current source supplying current to the second transistor.