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Soft-start circuit applied to DC-DC (direct-current) converter

A technology of soft start circuit and DC converter, applied in the direction of output power conversion device, electrical components, etc., can solve the problems of increasing chip pins and peripheral devices, high application cost, lack of competitiveness, etc., and achieve reduction of chip pins and peripheral devices, low application cost, and improved competitiveness

Active Publication Date: 2014-03-26
WUXI ZGMICRO ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The advantage of this method is that it is simple and easy to use. The disadvantage is that a soft-start capacitor Css is needed to control the soft-start time. This capacitor is often very large and cannot be integrated with the error amplifier EA, the conversion unit 110, the compensation circuit 120, and the acquisition circuit 130. On the same chip, this will increase the chip pins and peripheral devices, the application cost is relatively high, and it lacks competitiveness in practical applications

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  • Soft-start circuit applied to DC-DC (direct-current) converter
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  • Soft-start circuit applied to DC-DC (direct-current) converter

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Embodiment Construction

[0023] In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0024] Reference herein to "one embodiment" or "an embodiment" refers to a particular feature, structure or characteristic that can be included in at least one implementation of the present invention. "In one embodiment" appearing in different places in this specification does not all refer to the same embodiment, nor is it a separate or selective embodiment that is mutually exclusive with other embodiments. Unless otherwise specified, the words connected, connected, and joined in this document mean that they are electrically connected directly or indirectly.

[0025] figure 2 It is a schematic circuit diagram of a soft-start DC-DC converter 200 (also referred to as a soft-start circuit applied to a DC-DC converter) in an embodi...

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Abstract

The invention provides a soft-start circuit applied to a DC-DC (direct-current) converter. The soft-start circuit comprises a converting unit, a sampling circuit, a soft-start switch and an error amplifier. The converting unit is used for converting input voltage of the input end into output voltage of the output end according to a signal of a control end. The sampling circuit is used for collecting the output voltage of the output end of the converting unit to acquire feedback voltage. A first input end of the error amplifier is connected with reference voltage, a second input end of the error amplifier receives the feedback voltage, and an output end of the error amplifier is connected with the control end of the converting unit through the soft-start switch. In initial starting, the soft-start switch is controlled to be on and off continuously; after starting, the soft-start switch is controlled to be on constantly; therefore, not only the soft start function is achieved, but a great quantity of external capacitance can be omitted, various modules can be integrated in the same chip, chip pins and peripheral devices are reduced, application cost is lowered, and competiveness in actual application is improved.

Description

【Technical field】 [0001] The invention relates to the field of circuit design, in particular to a soft start circuit applied to a DC-DC converter. 【Background technique】 [0002] figure 1 An example of a direct current-direct current (DC-DC) converter with soft-start function is shown. Such as figure 1 As shown, the DC-DC converter includes a conversion unit 110, an error amplifier EA, a compensation circuit 120, a sampling circuit 130, and an output capacitor COUT. [0003] The conversion unit 110 converts the input voltage VIN at the input terminal to the output voltage VOUT at the output terminal according to the signal at the control terminal, and the output capacitor COUT is connected between the output terminal of the conversion unit 110 and ground. The sampling circuit 130 includes a first divider resistor R1 and a second divider voltage R2 connected in series between the output terminal of the conversion unit 110 and the ground, and the voltage at the middle node ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/36
Inventor 李展田文博尹航王钊
Owner WUXI ZGMICRO ELECTRONICS CO LTD
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