Step-down hysteretic switching converter and its control method

Abstract

The invention discloses a step-down hysteresis switch converter and a control method thereof, wherein the switch converter includes: a switch control module for controlling the conduction and shutdown of the upper and lower switch tubes; the switch control module With low power consumption mode; the switching converter also includes: low power consumption control logic module, connected with the switch control module, the low power consumption control logic module is used to detect the working status of the switching control module, and based on the working status output and working status The corresponding control signal is used to control the working power consumption mode of the switch control module; when the low power consumption control logic module detects that the working state satisfies the low power consumption condition, the low power consumption control logic module outputs the low power consumption control logic to the switch control module , so that the switch control module works in a low power consumption mode. While reducing the complexity of the circuit structure, the power consumption of the step-down hysteresis switching converter is reduced, and the conversion efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of switching electronic circuits, in particular to a step-down hysteresis switching converter and a control method thereof. Background technique [0002] In recent years, with the current rapid popularization of wireless true bluetooth headsets, due to their own small battery capacity, the problem of short battery life during use has been infinitely magnified. How to improve battery life and reduce The energy loss of the chip itself and the improvement of power usage efficiency are the most urgent problems to be solved in many markets. There are three main types of step-down switching converters that currently exist: voltage mode, current mode, and hysteretic mode. [0003] For conventional current-mode and voltage-mode switching converters, both of them require complex loop compensation during normal operation, which will not only increase the design difficulty of the converter, but also increase the minim...

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Problems solved by technology

This will not only increase the design cost, but also cause a certain power consumption and reduce the conversion efficiency

[0008] 2. Due to various problems in the traditional step-down hysteretic switching converter, the system is often compensated by designing a negative feedback control loop (FB’), such as figure 2 As shown, this design method has a good effect in PWM continuous mode, but on a certain basis, it increases the design difficulty and increases the minimum operating current

In order to realize the zero-crossing detection of the output current of the switching converter, the zero-current switching module is usually required to be in an active detection state, which will also increase the power consumption of the switching converter

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