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Integrated circuit and power supply device

An integrated circuit and circuit technology, which is applied in the direction of output power conversion devices, electrical components, regulating electrical variables, etc., can solve problems such as the normal operation of unfavorable loads, the limitation of the input voltage and output voltage of switching power supplies, etc.

Active Publication Date: 2022-04-26
芯洲科技(北京)股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In actual use, it can happen that the supplied input voltage is very close to the desired output voltage, resulting in a ratio between the desired output voltage and the supplied input voltage that is higher than the maximum threshold ratio
In this case, when the clock signal generated by the oscillator reverses, the switch tube will be forcibly turned off, causing the actual output voltage to be lower than the required output voltage, which is not conducive to the normal operation of the load
Therefore, the input and output voltage ranges of conventional switching power supplies are usually limited

Method used

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  • Integrated circuit and power supply device
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Embodiment Construction

[0020] Embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although certain embodiments of the present disclosure are shown in the drawings, it should be understood that the disclosure may be embodied in various forms and should not be construed as limited to the embodiments set forth herein; A more thorough and complete understanding of the present disclosure. It should be understood that the drawings and embodiments of the present disclosure are for exemplary purposes only, and are not intended to limit the protection scope of the present disclosure. It may be apparent, in some or all cases, that any of the embodiments described below may be practiced without the specific design details described below. In other instances, widely known structures and devices are shown in block diagram form to facilitate description of one or more embodiments.

[0021] In the description of the embodiments of the present ...

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Abstract

The invention provides an integrated circuit and a power supply device. The integrated circuit includes: a step-down circuit for alternately turning on first and second switches to step down an input voltage to an output voltage; the current detector is used for generating a current detection signal of the first switch; and a control circuit comprising: a mode control circuit for generating a pulse width modulation signal and a work clock signal based on the output voltage and the current detection signal; and a switching signal generator for generating a control signal based on the pulse width modulation signal and the work clock signal. The mode control circuit includes a clock signal generation circuit configured to generate a minimum off-time signal based on the pulse width modulated signal and to generate a work clock signal based on the minimum off-time signal and the adaptive clock pulse signal. By generating the minimum off-time signal for adjusting the cycle of the work clock signal based on the pulse width modulation signal, a wide input and output voltage range can be achieved with high integration.

Description

technical field [0001] The present disclosure relates to electronic circuits, and more particularly, to integrated circuits and power supply devices including the integrated circuits. Background technique [0002] Switching power supplies are widely used in power supply applications for various electronic devices. The switching power supply converts the input voltage provided by the power supply device (such as a battery or adapter) on the input side into an output voltage suitable for the load on the output side by controlling the on and off of the switch tube, so that the load can work normally. For example, for a step-down voltage converter, when the required output voltage is a certain value, as the provided input voltage decreases, the proportion of the required switch off time to the entire switching cycle will decrease. small to stabilize the output voltage. In order to ensure the stable and reliable operation of the switching power supply, the off time of the switc...

Claims

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Application Information

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IPC IPC(8): H02M3/158H02M3/157H02M1/088
CPCH02M3/158H02M3/157H02M1/088
Inventor 王强刘富梅王侠李润德张树春
Owner 芯洲科技(北京)股份有限公司
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