Boost chip and mode switching circuit thereof

A boost chip and mode switching technology, which is applied in the direction of electrical components, adjustment of electric variables, output power conversion devices, etc., can solve the problems of load current reduction and increase, and achieve the effect of increasing the speed of voltage rise

Pending Publication Date: 2019-04-12
SHANGHAI AWINIC TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of this, the technical solution of the present invention provides a boost chip and its mode switching circuit, which solves the problem that the load current decreases and then gradually rises when the boost chip is switched from the direct mode to the boost mode

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  • Boost chip and mode switching circuit thereof
  • Boost chip and mode switching circuit thereof
  • Boost chip and mode switching circuit thereof

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Embodiment Construction

[0036] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

[0037] As mentioned in the background art, when the existing boost chip is switched from the pass-through mode to the boost mode, the load current will gradually decrease and then gradually increase during the output voltage rise process, and the load current will not increase enough in the overall process. Smoothness, which is an undesirable problem for certain load applications. The circuit structure and working principle of the boost ...

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Abstract

The invention discloses a boost chip and a mode switching circuit thereof, in the booster chip, the mode switching circuit has a compensation current source. When the boost chip switches from a through mode to a boost mode, a compensation capacitor may be charged by the compensation current source. Therefore, the voltage rising speed at the output end of an error amplifier can be improved, and theload can be compensated for the current, so as to avoid the problem that the load current will gradually decrease and then gradually increase when the boost chip switches from the through mode to theboost mode, so that the load can work normally.

Description

Technical field [0001] The invention relates to the technical field of integrated circuits, and more specifically, to a boost chip and a mode switching circuit thereof. Background technique [0002] The DCDC chip is a switching power supply chip. Generally, it uses the energy storage characteristics of capacitors and inductors to perform high-frequency switching through a controllable switch tube (MOS, etc.), and stores the input energy in the capacitor (or inductor). When it is turned on, the electric energy is released to the load to provide energy. The DCDC chip mainly includes a boost (BOOST, BST) converter and a buck (Buck) converter. [0003] After the chip is started, the BST converter works in the direct mode by default. When it is detected that the current source voltage difference meets the mode switching conditions, the BST converter needs to switch to the boost mode. In the existing chip, after the BST converter is switched from the through mode to the boost mode, the...

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Application Information

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IPC IPC(8): H02M3/158
CPCH02M3/1584
Inventor 黄建刚程剑涛王云松吴传奎董渊孙洪军
Owner SHANGHAI AWINIC TECH CO LTD
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