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LDO overcurrent protection circuit

An overcurrent protection circuit and overcurrent protection technology, applied in the direction of regulating electrical variables, control/regulating systems, instruments, etc., can solve problems such as inability to start the load, and achieve the effect of saving power consumption and reducing power consumption

Pending Publication Date: 2021-10-08
TIANJIN JINHANG COMP TECH RES INST
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  • Abstract
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  • Claims
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Problems solved by technology

The foldback over-current structure reduces the over-current limit when the output drops, avoiding possible risks, but it may cause LDO latch-up and fail to start the load

Method used

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  • LDO overcurrent protection circuit
  • LDO overcurrent protection circuit

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Embodiment Construction

[0022] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided for more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art. It should be noted that, in the case of no conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and examples.

[0023] A LDO overcurrent protection circuit with current limiting and foldback functions, such as figure 1 As shown, the left half is the overcurrent protect...

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Abstract

The invention discloses an LDO (Low Dropout Regulator) over-current protection circuit, which comprises an over-current protection structure and a current turn-back structure, wherein the overcurrent protection structure is connected with the current turn-back structure; the overcurrent protection structure clamps a maximum output current through a loop formed by a current mirror, the current turn-back structure generates a current turn-back output current in proportion to an output voltage by adopting a negative feedback loop formed by an error amplifier, and an overcurrent limit and a turn-back point voltage can be adjusted by adjusting an external resistor of the current turn-back structure. Therefore, the voltage stabilizer is prevented from being latched. Compared with a traditional over-current limiting structure, power consumption can be reduced, and a power tube is protected from being burnt down; and compared with a traditional turn-back mode, the over-current limit and the turn-back point voltage can be conveniently adjusted by adjusting the external resistance, so that latch-up is avoided.

Description

technical field [0001] The invention belongs to the technical field of integrated circuit design, and in particular relates to an LDO overcurrent protection circuit. Background technique [0002] Compared with switching power supplies, linear voltage regulators (low dropout regulators, LDO) have better transient response, lower noise, simpler circuit structure and lower cost, and are favored in mobile power devices. As a very important part of the LDO circuit, the overcurrent protection circuit can prevent damage to it due to overload and output short circuit, and make the LDO work in a safe area. [0003] At present, there are mainly two modes for LDO overcurrent protection: constant overcurrent protection and foldback overcurrent protection. The structure of the constant over-current limit is simpler, but the power consumption is large, and the power tube may be burned by a large current after working for a long time. The foldback over-current structure reduces the over-...

Claims

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Application Information

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IPC IPC(8): G05F1/573
CPCG05F1/573
Inventor 晋超超朱天成候骏马宋鸿蕾
Owner TIANJIN JINHANG COMP TECH RES INST
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