Switching power supply, circuit and method for controlling constant on-time

An on-time, control circuit technology, applied in electronic switches, high-efficiency power electronic conversion, conversion equipment without intermediate conversion to AC, etc., can solve problems such as audio noise, avoid audio noise, improve work efficiency, and reduce conduction. The effect of pass loss

Active Publication Date: 2012-11-07
CHENGDU MONOLITHIC POWER SYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In light load situations, the switching frequency may be reduced to fall into the audio frequency range (such as 200Hz ~ 20kHz), causing audio noise

Method used

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  • Switching power supply, circuit and method for controlling constant on-time
  • Switching power supply, circuit and method for controlling constant on-time
  • Switching power supply, circuit and method for controlling constant on-time

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Embodiment Construction

[0015] 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.

[0016] 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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PUM

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Abstract

The invention discloses a switching power supply, a circuit and a method for controlling constant on-time. When the switching frequency of a switching circuit approximates to an audio frequency range, the switching power supply enters a sleep mode, and on-time of a switching tube is shortened to increase the switching frequency of the switching circuit, so that audio noise is avoided.

Description

technical field [0001] Embodiments of the present invention relate to electronic circuits, and in particular to a constant on-time controlled switching power supply, a control circuit and a control method thereof. Background technique [0002] Constant on-time (COT, constant on-time) control has been well applied in the power supply field due to its superior load transient response, simple internal structure and smooth operation mode switching. In a conventional COT-controlled switching power supply, the switching tube is turned on when the output voltage of the switching power supply is lower than a reference signal, and turned off when the on-time reaches a preset time. [0003] For the traditional COT control switching power supply, its switching frequency will gradually decrease as the load decreases. In light load situations, the switching frequency may be reduced to fall into the audio frequency range (eg 200Hz ~ 20kHz), causing audio noise. Contents of the inventio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/10
CPCY02B70/16H03K17/16H02M3/158Y02B70/10H02M1/0032
Inventor 姜礼节吴小康欧阳茜
Owner CHENGDU MONOLITHIC POWER SYST
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