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Constant-on-time control circuit and direct current-direct current converter controlled by same

A technology of constant on-time and on-time, which is applied in the direction of converting DC power input to DC power output, adjusting electrical variables, and automatic power control, etc. It can solve the problems of inability to continuously adjust the operating frequency of DC-DC converters, etc.

Active Publication Date: 2017-03-22
CHENGDU MONOLITHIC POWER SYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in existing COT-controlled DC-DC converters, we cannot flexibly and continuously adjust the operating frequency of the DC-DC converter outside the integrated circuit

Method used

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  • Constant-on-time control circuit and direct current-direct current converter controlled by same
  • Constant-on-time control circuit and direct current-direct current converter controlled by same
  • Constant-on-time control circuit and direct current-direct current converter controlled by same

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Embodiment Construction

[0019] Specific embodiments of the present invention will be described in detail below, and it should be noted that the embodiments described here are only for illustration, not for limiting the present invention. In the following detailed description of the invention, numerous details are set forth in order to better understand the invention. However, it will be understood by those skilled in the art that the present invention may be practiced without these specific details. In order to clearly illustrate the present invention, detailed descriptions of some specific structures and functions are simplified herein. In addition, similar structures and functions that have been described in detail in some embodiments will not be repeated in other embodiments. Although terms of the present invention have been described in conjunction with specific exemplary embodiments, these terms should not be construed as being limited to the exemplary embodiments set forth herein.

[0020] Th...

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PUM

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Abstract

The invention discloses a constant-on-time control circuit and a direct current-direct current switch converter controlled by the same. The constant-on-time control circuit comprises a synchronous signal generation circuit, an on-time generation circuit and a frequency-locking circuit, wherein the synchronous signal generation circuit generates a synchronous signal and a frequency modulation current signal; the on-time generation circuit generates on time for controlling a controllable switch based on an output voltage signal, an input voltage signal, the frequency modulation current signal and an error voltage signal; and the frequency-locking circuit performs comparison between the synchronous signal frequency and the on-time signal frequency to output the error voltage signal, wherein the steady-state switching frequency of the controllable switch can be regulated by changing the magnitude of the frequency modulation current signal so as to enable the working frequency of the direct current-direct current converter to be continuously adjustable.

Description

technical field [0001] The present invention relates to electronic circuits, specifically but not limited to a constant on-time control circuit and a DC-DC converter controlled therewith. Background technique [0002] Constant On Time (COT) control is widely used in DC-DC converters because of its simple control loop and fast dynamic response. The traditional COT control method is a frequency conversion control method. By setting a fixed switch on-time, changing the switching frequency of the system, and then adjusting the on-duty cycle of the switch, and then adjusting the output voltage of the converter. In order to make the system more stable, in some improved COT control methods, the switching frequency of the DC-DC converter controlled by the COT remains basically unchanged during the working process, and the switching frequency is adjusted according to the output voltage and input voltage of the DC-DC converter. The conduction time, thereby adjusting the conduction du...

Claims

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Application Information

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IPC IPC(8): H02M1/08H02M3/156
CPCH02M1/08H02M3/156H03K5/24H03L7/093
Inventor 李磊
Owner CHENGDU MONOLITHIC POWER SYST
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