US 12,658,903 B2 · Switching converter controller with adaptive pulse-frequency modulation timer circuit

Abstract

A switching converter controller includes: mode control logic; and a pulse-frequency modulation (PFM) timer circuit coupled to the mode control logic. The PFM timer circuit includes: a first terminal; a second terminal; a digital-to-analog converter (DAC); a current source; a capacitor; and a comparator. A first terminal of the DAC is coupled to the first terminal of the PFM timer circuit. The current source has a first terminal, a second terminal, and a third terminal. The second terminal of the current source is coupled to a second terminal of the DAC. A first terminal of the capacitor is coupled to the first terminal of the current source. The comparator has first, second, and third terminals. The first terminal of the comparator is coupled to the first terminal of the capacitor. The third terminal of the comparator is coupled to the second terminal of the PFM timer circuit.

Claims20

Dependent claims

A switching converter controller comprising:

mode control logic;
and
a pulse-frequency modulation (PFM) timer circuit coupled to the mode control logic, the PFM timer circuit including:
a first terminal;
a second terminal;
a current source having a first terminal, a second terminal, and a third terminal, the current source configurable to receive a first signal at the second terminal in a first mode and receive a second signal at the second terminal in a second mode, the first signal indicative of a zero valley current, and the second signal indicative of a difference between a feedback voltage and a reference voltage;
a capacitor having a first terminal and a second terminal, the first terminal of the capacitor coupled to the first terminal of the current source;
a comparator having a first terminal, a second terminal, and a third terminal, the first terminal of the comparator coupled to the first terminal of the capacitor, and the third terminal of the comparator coupled to the second terminal of the PFM timer circuit.

5 more elements

Dependencies are inferred from the claim text.

Switching converter controller with adaptive pulse-frequency modulation timer circuit

Life of this patent

Switching converter controller with adaptive pulse-frequency modulation timer circuit

Life of this patent

Abstract

Claims20