Soft start system suitable for low dropout regulator and control method

A low-dropout linear and soft-start technology, which is applied in the direction of control/regulation systems, instruments, and electrical variable adjustments, can solve problems such as excessive average current and inability to solve peak currents, so as to reduce average current and reduce burnout Risk, the effect of suppressing short-time peak current

Pending Publication Date: 2021-08-31
博流智能科技(南京)有限公司
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  • Application Information

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Problems solved by technology

figure 1 The circuit in the circuit only solves the problem of excessive average current during startup, and cannot solve the problem of peak current

Method used

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  • Soft start system suitable for low dropout regulator and control method
  • Soft start system suitable for low dropout regulator and control method
  • Soft start system suitable for low dropout regulator and control method

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Embodiment Construction

[0060] Preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0061] In order to further understand the present invention, the preferred embodiments of the present invention are described below in conjunction with examples, but it should be understood that these descriptions are only to further illustrate the features and advantages of the present invention, rather than limiting the claims of the present invention.

[0062] The description in this part is only for several typical embodiments, and the present invention is not limited to the scope of the description of the embodiments. The mutual replacement of the same or similar prior art means and some technical features in the embodiments is also within the scope of the description and protection of the present invention.

[0063] The description of the steps in each embodiment in the specification is only for convenience of description, and the imple...

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Abstract

The invention discloses a soft start system and control method suitable for a low dropout linear regulator. The system comprises a ramp voltage generation module which is used for generating a ramp voltage Vramp rising slowly; a voltage selection module which is used for selecting the minimum value Vmin in the ramp voltage Vramp or Vref and outputting the minimum value Vmin; a voltage clamping module which is used for temporarily clamping an output voltage of the comparison module at the initial stage of power-on of the power supply, and limiting an input voltage of the power level through a buffer level so as to restrain a peak current; a comparison module which is used for comparing the minimum value Vmin with the feedback voltage Vfb and adjusting the current of the power level according to a comparison result; and a buffer stage module which is used for providing low-impedance output voltage Vgpower. According to the system, the average current in the starting process can be reduced, meanwhile, short-time peak current appearing on a power tube is restrained, the LDO and a load circuit of the LDO are protected, a problem of electromagnetic interference caused by the peak current is avoided, and meanwhile the risk of circuit burning is reduced.

Description

technical field [0001] The invention belongs to the technical field of electronic circuits, and relates to a linear voltage regulator, in particular to a soft start system and a control method suitable for a low-dropout linear voltage regulator. Background technique [0002] Low dropout linear regulators (LDO, Low Dropout Regulation) are widely used in mobile electronic devices and the Internet of Things due to their low noise, low cost, and simple circuit structure. Traditionally structured LDOs have an off-chip capacitor on the order of microfarads at the output to help stabilize the loop while providing good load transient characteristics. [0003] During the start-up process of an LDO with an off-chip capacitor, if no special treatment is performed, a large peak current will appear on the power tube, which may cause the risk of burning the chip. In Chinese patent CN104331112A, a kind of soft start circuit is proposed, the principle block diagram is as follows figure 1 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05F1/56
CPCG05F1/56
Inventor 田缝吴俊史军梁韩洪征宋永华
Owner 博流智能科技(南京)有限公司
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