Electronic device and method for DC-DC conversion with slope compensation
View Patent ↗An electronic device is provided which comprises circuitry for DC-DC conversion configured to switch an inductor current through an inductor using slope compensation, wherein the circuitry comprises a slope compensation stage configured to generate a slope compensation signal as a function of an switching frequency of the DC-DC conversion and an input voltage of the DC-DC converter.
1. An electronic device comprising a DC-DC converter configured to switch an inductor current through an inductor using slope compensation, wherein the circuitry comprises a slope compensation stage configured to generate a slope compensation signal as a function of a switching frequency of the DC-DC conversion and an input voltage of the DC-DC converter, wherein the slope compensation stage is configured to generate a slope of the compensation signal as a function of the duty cycle of the DC-DC conversion so as to compensate varying values of the duty cycles.
2. The electronic device according to claim 1 , wherein the switching frequency is derived from a current of an oscillator.
3. The electronic device according to claim 1 , wherein the slope compensation stage is configured to adjust a resistor value in response to a magnitude of the oscillator current so as to provide an adjusted resistor.
4. The electronic device according to claim 3 , wherein the compensation stage includes a voltage follower coupled with the adjusted resistor and configured to control a ramp current through the adjusted resistor in response to the input voltage.
5. The electronic device according to claim 4 , wherein the slope compensation signal is generated with by charging a capacitor with a current that is a function of the ramp current.
6. The electronic device according to claim 1 , wherein the compensation stage includes a voltage follower coupled with the adjusted resistor and configured to control a ramp current through the adjusted resistor in response to the input voltage.
7. The electronic device according to claim 1 , wherein the compensation stage includes a voltage follower coupled with the adjusted resistor and configured to control a ramp current through the adjusted resistor in response to the input voltage.
8. The electronic device according to claim 2 , wherein the compensation stage includes a voltage follower coupled with the adjusted resistor and configured to control a ramp current through the adjusted resistor in response to the input voltage.
9. The electronic device according to claim 3 , wherein the slope compensation signal is generated with by charging a capacitor with a current that is a function of the ramp current.
10. A method of operating a DC-DC converter, the method comprising: switching a current through an inductor with a switching frequency, compensating a slope of the current through the inductor with a compensation signal which is a function of a switching frequency of the DC-DC converter and the input voltage of the DC-DC converter, wherein a slope of the compensation signal is also chosen so as to compensate varying values of the duty cycle.