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Output stage circuit of high-side switch

An output stage circuit, high-side switch technology, applied in circuits, electronic switches, electrical components, etc., can solve problems such as inability to accurately limit PMOS power transistor M1, low loop gain, and excessive breakdown of gate oxide layers. , to achieve the effect of saving the layout area

Active Publication Date: 2020-03-31
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problem with this structure is that the loop gain is low, and the gate-source voltage V of the PMOS power transistor M1 cannot be precisely limited when the NMOS transistor M3 is turned on. GS , there is a gate-source voltage V GS Risk of Excessive Gate Oxide Breakdown

Method used

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Embodiment Construction

[0030] Below in conjunction with accompanying drawing and specific embodiment, describe technical solution of the present invention in detail:

[0031] Such as image 3 Shown is a schematic diagram of the output stage circuit principle of a high-side switch proposed by the present invention. The high-side switch adopts a PMOS power transistor, and the output stage circuit includes a power transistor gate drive module and an output negative voltage clamp module. The power tube gate drive module is used to control the switching of the power tube under all circumstances, and to ensure the gate-source voltage |VGS| of the power tube within a limited range, so as to avoid the breakdown of the gate oxide layer of the power tube. When the power tube is turned off, the output negative pressure clamping module starts to work, and pulls down the grid potential of the power tube, so that the power tube is turned on and the current of the power tube is equal to the current of the inductor...

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Abstract

The invention discloses an output stage circuit of a high-side switch, and belongs to the technical field of power integrated circuits. According to the output stage circuit provided by the invention,an output negative voltage clamping module is combined with a power tube grid driving module and a power tube to realize inductive load rapid demagnetization, and the power tube is adopted to replacea similar Zener circuit to flow through large current in a traditional scheme, so that the layout area is saved; the absolute value of the negative voltage of the source electrode of the power tube during inductive load demagnetization is limited within a limited range through the negative feedback system so as to ensure the safe operation of the whole system; in the power tube grid driving module, the magnitude of the grid source voltage of a power tube is limited through a first NMOS tube and a seventh PMOS tube, and it is guaranteed that grid oxide of the power tube cannot be broken down under any condition. Meanwhile, a super source follower structure is applied to the output negative voltage clamping module, so that the loop gain of a negative feedback loop during output negative voltage clamping is improved, and the clamping precision is improved.

Description

technical field [0001] The invention belongs to the technical field of power integrated circuits, and relates to an output stage circuit of a high-side switch, which is used for fast demagnetization of an inductive load of the high-side power switch. Background technique [0002] High-side power switches have important applications in the fields of automotive electronics and industrial control because of their advantages of high integration and easy control. In automotive electronics, the high-side power switch replaces the original relay and can be used to drive various on-board equipment such as fuel injectors, motors, and lights. As loads, fuel injectors, motors and other equipment usually show perceptual characteristics. Therefore, the smart high-side power switch needs to be able to quickly discharge the magnetic energy on the inductive load after it is turned off, so as to ensure the safe operation of the entire system. [0003] The high-side power switch usually use...

Claims

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Application Information

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IPC IPC(8): H03K17/082
CPCH03K17/0822
Inventor 甄少伟梁怀天方舟罗攀易子皓张波
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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