System for preventing generation of oscillation at time of closing of power tube of LDO

A power tube and switch technology, which is applied in the field of control systems that oscillate when the power tube is turned off, can solve problems such as the influence of LDO circuit signal stability, and achieve the effect of avoiding the phenomenon of oscillation.

Active Publication Date: 2018-07-13
CHENGDU LIGHT COLLECTOR TECH
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Problems solved by technology

[0004] The existence of the above oscillation will obviously affect the signal stability in the LDO circuit, and in the design of the CIS chip, the analog circuit part needs to have high anti-interference ability and as low as possible noise

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  • System for preventing generation of oscillation at time of closing of power tube of LDO
  • System for preventing generation of oscillation at time of closing of power tube of LDO
  • System for preventing generation of oscillation at time of closing of power tube of LDO

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[0040] In order to make the content of the present invention clearer and easier to understand, the content of the present invention will be further described below in conjunction with the accompanying drawings. Of course, the present invention is not limited to this specific embodiment, and general replacements known to those skilled in the art are also covered within the protection scope of the present invention.

[0041] In the control circuit of the present invention, when the enabling signal of the LDO circuit is turned off, the relevant bias nodes in the LDO circuit are quickly pulled to the ground or the power supply voltage through a MOS tube, and the power tube is turned off at the same time; the control circuit receives the enabling signal After the signal, the gate voltage of the power tube is also gradually raised. In the present invention, the speed of pulling up the grid voltage of the power tube is different from the traditional process of pulling up to the power ...

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Abstract

The invention provides a system for preventing generation of oscillation at time of closing of a power tube of an LDO. The system comprises a control circuit, wherein the control circuit performs individual closing control on the power tube after receiving a closing enable signal; and the control circuit automatically detects grid voltage of the power tube, and slowly discharges until the grid voltage of the power tube rises to power voltage. According to the control circuit provided by the invention, the grid voltage of the power tube can be raised individually per stages, so that the currentof the power tube is not zero instantly, the resonance caused by the fact that the output current is instantly reduced to zero when the output of the LDO circuit has relatively large parasitic inductance, and thus the external LC resonance circuit has a steady state building process, and the oscillation phenomenon is avoided.

Description

technical field [0001] The invention relates to the technical field of integrated circuits, in particular to a control system for preventing oscillation when a power tube of an LDO is turned off. Background technique [0002] Image sensor chips are widely used in various portable electronic devices, security monitoring equipment, vehicle electronics, etc. Among them, CMOS image sensor (CIS) is the most commonly used in civilian products. Due to the increasing performance requirements of this type of chip, the stability and low-noise performance of the power supply circuit in the chip is one of the key points in the design of the analog circuit part. [0003] A low-dropout linear regulator (Low Dropout Regulator, LDO) is usually used inside the CIS chip to generate a voltage that is stable, strong in anti-interference and has a certain driving capability. The voltage output by the LDO is generally used as the power supply voltage, so it is very necessary to ensure the stable...

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Application Information

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IPC IPC(8): H03K17/16H03K17/687
CPCH03K17/161H03K17/687H03K2217/0027
Inventor 芮松鹏蔡化
Owner CHENGDU LIGHT COLLECTOR TECH
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