Self-adaptive sectional driving DC-DC (Direct Current to Direct Current) converter

Abstract

The invention relates to an integrated circuit technology, in particular to a load self-adaptive sectional driving circuit with a mode switching function. A self-adaptive sectional driving DC-DC (Direct Current to Direct Current) converter which is disclosed by the invention comprises a conversion unit, a driving unit and a feedback control unit and is characterized in that the conversion unit comprises a switching circuit and a filtering circuit; the switching circuit comprises a plurality of PMOS (P-channel Metal Oxide Semiconductor) power tubes which are connected in parallel and a plurality of NMOS (N-channel metal oxide semiconductor) power tubes which are connected in parallel; the PMOS power tubes are divided into PM groups; the NMOS power tubes are divided into NM groups; and the driving unit can be used for respectively controlling on-off of each group of PMOS tubes and NMOS tubes. The self-adaptive sectional driving DC-DC converter has the beneficial effects that a driving mode of the power tubes is changed; the effect of working in a PSM (Pulse Skipping Modulation) control mode under a light load is improved; the number of the started power tubes is changed by detecting variation of a load current so as to minimize the sum of conduction loss and driving loss of the power tubes, thereby improving efficiency of the DC-DC converter and particularly efficiency under the light load. The self-adaptive sectional driving DC-DC converter is particularly suitable for the DC-DC converter.

Description

technical field [0001] The invention relates to integrated circuit technology, in particular to a load self-adaptive section drive circuit with mode switching. Background technique [0002] A DC-DC converter is a voltage converter that converts a non-fixed DC voltage into a fixed output DC voltage. DC-DC converters are divided into three categories: step-up DC-DC converters, step-down DC-DC converters, and step-up and step-down DC-DC converters. According to its different control modes, it is divided into: PWM (Pulse Width Modulation) control mode, PFM (Pulse Frequency Modulation) control mode, PSM (Pulse Interval Modulation Mode) control mode, and hybrid control mode (two or more of the above control modes) combination of modes), the PWM control type has high efficiency at medium to high loads and has good output voltage ripple and noise. PFM and PSM modes are usually used in the case of light load (lower load current) to improve the conversion efficiency of the converter...

AI Technical Summary

Problems solved by technology

PFM and PSM modes are usually used in the case of light load (lower load current) to improve the conversion efficiency of the converter, but both modes have an obvious disadvantage: the switching frequency of the power tube changes with the change of the load , which limits its application in some fields, such as the RF (radio frequency) field

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