Controllers for DC to DC converters

摘要

A controller includes a ramp signal generator and control circuitry coupled to the ramp signal generator. The ramp signal generator provides a control current through a resistive component to control energy stored in a first energy storage component. The ramp signal generator further generates a ramp signal based on the energy stored in the first energy storage component. The control circuitry adjusts a voltage at one end of the resistive component thereby controlling the control current to indicate a voltage across a second energy storage component. The control circuitry further controls a current through the second energy storage component within a predetermined range based on the ramp signal.

主权项

1. A controller comprising:
a ramp signal generator operable for providing a control current through a resistive component to control charging of and discharging of a capacitive component, said capacitive component operable for generating a ramp signal based on said charging and said discharging; and control circuitry coupled to said ramp signal generator and operable for controlling a voltage across said resistive component to indicate a voltage across an inductive component thereby controlling said control current to indicate said voltage across said inductive component, and operable for controlling a current through said inductive component into a first predetermined range by controlling said ramp signal of said capacitive component into a second predetermined range, wherein said ramp signal generator charges said capacitive component if said current through said inductive component varies from a first level to a second level, and discharges said capacitive component if said current through said inductive component varies from said second level to said first level, and wherein a ripple magnitude of said current through said inductive component is determined by a difference between said first and second levels.