Circuits and methods for controlling a DC/DC converter

摘要

A converter circuit includes a converter and a controller. The converter converts an input voltage to an output voltage. The controller receives a reference voltage, generates a slew voltage having a substantially constant first slew rate if the reference voltage changes from a first level to a second level, and controls the converter based on the slew voltage to cause the output voltage to change from a third level to a fourth level at a substantially constant second slew rate.

主权项

1. A converter circuit comprising:
a converter operable for converting an input voltage to an output voltage; and a controller coupled to said converter and operable for receiving a reference voltage at a first terminal, generating a slew voltage at a second terminal, controlling a current flowing through said first and second terminals to change said slew voltage at a substantially constant first slew rate if said reference voltage changes from a first level to a second level, and controlling said converter based on said slew voltage to cause said output voltage to change from a third level to a fourth level at a second slew rate, wherein said controller comprises:
a resistor coupled between a first node and a second node;a first transistor coupled between said first node and said first terminal;a second transistor coupled between said second node and said second terminal; anda control circuit operable for controlling said current to flow through said resistor and said first and second transistors by controlling node voltages on said first node and said second node, and by controlling gate voltages of said first transistor and said second transistor, and wherein said controller adjusts said slew voltage according to said current.