CPC H02M 3/157 (2013.01) [H02M 3/07 (2013.01)] | 20 Claims |
1. A multi-phase switching converter, comprising:
a plurality of switching phases configured to convert an input voltage to an output voltage, wherein the plurality of switching phases has a master phase and at least one slave phase configured to be enabled based on a phase additional signal;
a master controller configured to generate a master control signal to control a switch in the master phase;
a pulse generator configured to provide a pulse signal having a duty cycle of 0.5 by frequency-dividing the master control signal under a phase-added operation;
at least one slave controller, each slave controller is configured to generate a respective slave control signal to control a switch in a corresponding slave phase that is to be enabled, wherein each slave controller comprises:
a first circuit configured to charge a first capacitor with a charge current and discharge a second capacitor with a discharge current in response to logic high of the pulse signal, wherein a ratio of the charge current and the discharge current is set based on a slave phase number under the phase-added operation;
a second circuit configured to charge the second capacitor with the charge current and discharge the first capacitor with the discharge current in response to logic low of the pulse signal; and
a comparison circuit configured to compare a first voltage across the first capacitor with a second voltage across the second capacitor and provide an enable signal for turning on the switch in the corresponding slave phase to be enabled.
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