Switching converter, and control circuit and control method thereof

A technology of switching converters and switching circuits, applied in control/regulation systems, converting DC power input to DC power output, instruments, etc., can solve problems affecting and affecting the output stability of switching converters, and achieve The effect of keeping the signal stable

Active Publication Date: 2012-02-29
CHENGDU MONOLITHIC POWER SYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Since the output terminal of the slope compensation circuit 105 is electrically connected to the output terminal of the feedback circuit 106, the output current of the slope compensation circuit 105 will flow into / out of the feedback circuit 106, which will affect the feedback signal FB and the output signal OUT, thereby affecting the switch conversion. output stability of the

Method used

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  • Switching converter, and control circuit and control method thereof
  • Switching converter, and control circuit and control method thereof
  • Switching converter, and control circuit and control method thereof

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Embodiment Construction

[0020] 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 description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. It will be apparent, however, to one of ordinary skill in the art that these specific details need not be employed to practice the present invention. In other instances, well-known circuits, materials or methods have not been described in detail in order to avoid obscuring the present invention.

[0021] Throughout this specification, reference to "one embodiment," "an embodiment," "an example," or "example" means that a particular feature, structure, or characteristic described in connection with the embodiment or example is included in the present invention. In at least one embodiment. Thus, appearances of the phrases "in on...

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Abstract

A switching converter, and a control circuit and a control method thereof are disclosed. A feedback circuit is separated from a slope compensation circuit through a buffer circuit. Therefore, an output current of the slope compensation circuit can not influence on a feedback signal and an output signal. The output signal of the switching converter can remain stable.

Description

technical field [0001] Embodiments of the present invention relate to electronic circuits, and in particular to a switching converter and its control circuit and control method. Background technique [0002] Constant on-time control has been well applied in the field of power supplies due to its superior load transient response, simple internal structure and smooth operation mode switching. [0003] figure 1 It is a block diagram of an existing constant on-time control switching converter, including an on-time control circuit 101 , a comparison circuit 102 , a logic circuit 103 , a switch circuit 104 and a feedback circuit 106 . The switch circuit 104 includes at least one switch tube, and the input signal IN is converted into the output signal OUT by turning on and off of the at least one switch tube. The on-time control circuit 101 generates an on-time control signal COT to control the on-time of at least one switch in the switch circuit 104 . The feedback circuit 106 i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/158
CPCH02M3/158H02M1/0003
Inventor 席小玉
Owner CHENGDU MONOLITHIC POWER SYST
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