Voltage-stabilizing circuit with hiccup mode over-current protection function

A voltage stabilizing circuit and overcurrent protection technology, applied in output power conversion devices, electrical components, regulating electrical variables, etc., can solve the problems of voltage stabilizing circuit damage, complicated design, and increased cost, so as to reduce application costs and improve The effect of reliability

Active Publication Date: 2012-07-11
深圳德信微电子有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the existing hiccup mode overcurrent protection function is realized by analog circuit, the design is complex and requires an external capacitor for timing control, it is not easy to be ful...

Method used

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  • Voltage-stabilizing circuit with hiccup mode over-current protection function

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Embodiment Construction

[0023] The present invention will be described in further detail below with reference to the accompanying drawings.

[0024] refer to figure 1 , the voltage stabilizing circuit of the present invention includes a hiccup mode control circuit, a soft start circuit, an error amplifier EA, a current limiting circuit, a foldback current limiting circuit, a feedback resistor R 1 , R 2 and regulating circuits. Among them: the soft start signal V output by the soft start circuit S , connected to the input of the error amplifier EA; the feedback resistor R 1 and R 2 Connected in series between the output voltage and zero scale, R 2 The voltage on is the output feedback voltage V FB ; The error amplifier EA contains three input signals, and its positive input signal is the reference voltage V 1 and soft-start signal V S , the reverse input signal is the output feedback voltage V FB , the output voltage of the error amplifier is controlled by the smaller positive input signal mi...

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PUM

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Abstract

The invention discloses a voltage-stabilizing circuit with a hiccup mode over-current protection function, which mainly solves the problem that the hiccup mode over-current protection function in the prior art cannot be easily integrated, and the problem of overlarge current in a soft-starting stage during a continuous overcurrent period. The voltage-stabilizing circuit, disclosed by the invention, comprises a hiccup mode control circuit, a soft-starting circuit, an error amplifier circuit, a current limiting circuit, a feedback resistor and a regulating circuit; the hiccup mode control circuit comprises a continuous overcurrent detection circuit, a dormancy time circuit, an overload removal detection circuit and a control circuit to control the soft-starting circuit to repeatedly start when the continuous overcurrent is detected so that the circuit works in a hiccup mode, and input ends of the hiccup mode control circuit and the current limiting circuit are connected with a turn-back current limiting circuit to detect an output voltage state and reduce current in a soft-starting stage during the continuous overcurrent period. The voltage-stabilizing circuit, disclosed by the invention, has high reliability; the hiccup mode over-current protection function can be totally integrated inside a chip and can be applied to various power management systems.

Description

technical field [0001] The invention belongs to the technical field of electronic circuits, and relates to an analog integrated circuit, in particular to a voltage stabilizing circuit with a hiccup mode overcurrent protection function, which can be used in power management systems. Background technique [0002] At present, the trend of voltage regulator circuit chips is to integrate power discrete devices into the chip as much as possible, which means that the power consumption inside the chip will become larger, especially when overload or even short circuit occurs, the power tube will pass through for a long time. Large current may cause the circuit to overheat and burn out. The overcurrent protection methods in the voltage regulator circuit include maximum current limit, foldback current limit and hiccup mode overcurrent protection. [0003] The maximum current limit means that when the load is greater than the set maximum value, the output current is limited to this max...

Claims

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Application Information

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IPC IPC(8): G05F1/56H02M1/32
CPCY02B70/16Y02B70/10
Inventor 来新泉李演明毛翔宇周波来音
Owner 深圳德信微电子有限公司
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