Switching converter controlled by constant on-time and its controller and control method

A technology of switching converters and controllers, applied in control/regulation systems, output power conversion devices, DC power input conversion to DC power output, etc., can solve the slope signal noise interference, reduce the input adjustment rate of switching converters and Problems such as load regulation and complicated circuit design achieve the effect of not being affected by noise and being easy to use

Active Publication Date: 2017-12-26
CHENGDU MONOLITHIC POWER SYST
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This means that once the application is changed, the values ​​of the resistor Rr1 and the capacitors Cr1 and Cr2 also need to be changed accordingly, which undoubtedly makes the circuit design complicated
also, figure 1 The ramp signal shown is highly susceptible to noise, degrading the line and load regulation of the switching converter

Method used

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  • Switching converter controlled by constant on-time and its controller and control method
  • Switching converter controlled by constant on-time and its controller and control method
  • Switching converter controlled by constant on-time and its controller and control method

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[0030] 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.

[0031] 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 constant on-time controlled switching converter, a controller and a control method thereof are disclosed, wherein the switching converter includes a main transistor and an inductor coupled to the main transistor. The control method includes: generating a conduction time control signal; generating a ramp signal, and adjusting the ramp signal to be equal to the common-mode voltage when the main transistor is turned from off to on; based on the ramp signal, the common-mode voltage, the reference signal and A feedback signal representative of the output voltage of the open converter generates a comparison signal; and a control signal is generated based on the on-time control signal and the comparison signal to control the main transistor.

Description

technical field [0001] The present invention relates to an electronic circuit, in particular to a constant on-time controlled switching converter, a controller and a control method thereof. Background technique [0002] Constant on-time control (COT control) is widely used in the power supply field due to its excellent transient response and simple structure. However, for a switching converter using constant on-time control, if the estimated serial resistance (ESR) of the output capacitor is not large enough, sub-harmonic oscillation may appear on the output voltage. [0003] In order to eliminate the above-mentioned sub-harmonic oscillation, a common method is to take ripple injection. Such as figure 1 As shown, resistor Rr1 and capacitor Cr1 generate a ramp signal in phase with the current flowing through inductor L. Through the capacitor Cr2, the ramp signal is coupled to the feedback signal FB representing the output voltage VOUT to eliminate sub-harmonic oscillation....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/14H02M3/155
CPCH02M3/156H02M1/0025
Inventor 詹姆斯·H·阮周景海
Owner CHENGDU MONOLITHIC POWER SYST
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