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A current detection circuit, a power switch chip and a switching power supply

A technology of current detection circuit and power switch, which is applied in the direction of measuring current/voltage, converting DC power input into DC power output, output power conversion device, etc., can solve the problems of poor flexibility and reliability, and achieve reliability improvement, Improve packaging flexibility and enhance the effect of heat dissipation

Active Publication Date: 2018-01-26
SHENZHEN SUNMOON MICROELECTRONICS
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the embodiments of the present invention is to provide a current detection circuit, aiming to solve the problem that the existing power switch chip requires at least four pin packages, poor flexibility and reliability

Method used

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  • A current detection circuit, a power switch chip and a switching power supply
  • A current detection circuit, a power switch chip and a switching power supply
  • A current detection circuit, a power switch chip and a switching power supply

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Embodiment Construction

[0025] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not constitute a conflict with each other.

[0026] In the embodiment of the present invention, the sampling signal of current detection is obtained through the ground pin, so that the power switch chip saves the traditional CS pin, and the package with three pins such as TO252 and TO92 can be used, thereby improving the packaging flexibility of the chip , Strengthen the heat dissipation of the chip, improve the efficiency and life of the ...

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Abstract

The present invention is applicable to the field of integrated circuits, and provides a current detection circuit of a power switch, a power switch chip and a switching power supply. signal; the threshold voltage stabilizing unit is used to generate a comparison voltage according to the control open signal and keep the comparison voltage stable; the current detection unit is used to compare the sampling signal with the comparison voltage to generate a detection result; the leading edge blanking unit is used to The blanking control signal generates a control off signal to control the power switch to turn off. The present invention obtains the sampling signal of current detection through the ground pin, so that the power switch chip saves the traditional CS pin, and can use packages with three pins such as TO252 and TO92, thereby improving the packaging flexibility of the chip and strengthening The heat dissipation of the chip is improved, the efficiency and life of the power supply system are improved, and the reliability of the system is also improved.

Description

technical field [0001] The invention belongs to the field of integrated circuits, and in particular relates to a current detection circuit, a power switch chip and a switching power supply. Background technique [0002] With the rapid development of integrated circuits, power switch chips and switching power supplies have been applied to various fields. figure 1 It is a traditional switching power supply application scheme based on BUCK topology, where VDD is the power supply pin of the power switch chip, GND is the ground pin of the power switch chip, and DRAIN is the drain pin of the power switch MOS tube integrated in the power switch chip , CS is the current detection pin of the power switch chip connected to the source of the power switch MOS tube integrated in the chip, the gate of the power switch MOS integrated in the chip receives the control signal output by the controller, VIN and VOUT are respectively the switching power supply system input and output. [0003]...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R19/00H02M3/155
Inventor 李照华谢靖林道明于井亮戴文芳
Owner SHENZHEN SUNMOON MICROELECTRONICS
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