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Switch converter and controller and control method thereof

A technology for switching converters and control terminals, applied in control/regulation systems, converting DC power input to DC power output, instruments, etc., can solve the problems that the conduction time of the main transistor cannot be further reduced, and the output voltage has large ripples.

Active Publication Date: 2015-03-25
CHENGDU MONOLITHIC POWER SYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the existence of the minimum on-time, the on-time of the main transistor cannot be further reduced after being reduced to the minimum on-time
At this time, the output voltage will rise, and there will be a large ripple on the output voltage

Method used

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  • Switch converter and controller and control method thereof
  • Switch converter and controller and control method thereof
  • Switch converter and controller and control method thereof

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Embodiment Construction

[0018] 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.

[0019] 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

The invention discloses a switch converter comprising a main transistor, and a controller and control method of the switch converter. The controller comprises a clock generation circuit and a control circuit. The clock generation circuit generates a clock signal deciding the switch frequency of the main transistor. The control circuit is coupled to the clock generation circuit and generates a control signal according to the clock signal and a feedback signal representing the output signal of the switch converter to control the main transistor. The clock generation circuit is further coupled to the control circuit to receive the control signal and judges whether the on time of the main transistor is smaller than a time threshold value according to the control signal. If the on time of the main transistor is smaller than the time threshold value, the clock generation circuit changes the frequency of the clock signal to adjust the on time of the main transistor to be equal to the time threshold value.

Description

technical field [0001] The present invention relates to electronic circuits, in particular to switching converters and their controllers and control methods. Background technique [0002] Fixed-frequency peak current control is a commonly used control method for switching converters. Under constant-frequency peak current control, a feedback signal representing the output signal of the switching converter and a reference voltage are sent to an error amplifier to generate a compensation signal. The main transistor is turned on when the clock signal comes, and turned off when the current sampling signal representing the current flowing through it increases to the compensation signal. Due to the internal delay of the control circuit, there is a minimum on-time, and the main transistor can be turned off after its on-time reaches the minimum on-time. [0003] When the input voltage of the switching converter increases, the conduction time of the main transistor decreases. Due t...

Claims

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Application Information

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IPC IPC(8): H02M1/14H02M3/156
CPCH02M1/14H02M3/156H02M1/0025G05F3/26H02M1/0009
Inventor 李磊
Owner CHENGDU MONOLITHIC POWER SYST
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