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Step-down DC-DC converter

A DC converter and step-down technology, applied in the direction of DC power input conversion to DC power output, high-efficiency power electronic conversion, output power conversion device, etc., can solve the problem of long duration of overshoot in large current transient response

Active Publication Date: 2020-10-23
WUXI ETEK MICROELECTRONICS
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  • Abstract
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Problems solved by technology

[0009] The purpose of the present invention is to provide a step-down DC-DC converter, which can solve the problem of long duration of overshoot in transient response of large current
[0011] Compared with the prior art, the present invention controls the discharge path to discharge the output circuit when the feedback voltage is greater than the second reference voltage and the first power transistor is turned off, which can very well solve the overshoot duration of the large current transient response long question

Method used

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Embodiment Construction

[0022] 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.

[0023] 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.

[0024] The invention proposes a step-down DC-DC converter, which can solve the problem of long duration of overshoot in transient response of large current.

[0025] ima...

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Abstract

The invention provides a step-down DC-DC converter, which further comprises an output circuit, a voltage feedback circuit, a discharge path and a discharge control circuit, wherein the output circuitis used for converting an input voltage into an output voltage, and comprises a first power transistor and a second power transistor which are connected in series between an input end and a groundingend; the voltage feedback circuit is used for acquiring a feedback voltage based on the output voltage; the discharge path is coupled between the output circuit and the grounding end and is controlledin discharging; and the discharge control circuit controls the discharge path to discharge the output circuit when the feedback voltage obtained by the voltage feedback circuit is greater than a second reference voltage and the first power transistor is cut off, and controls the discharge path to prohibit discharge when the feedback voltage obtained by the voltage feedback circuit is smaller thanthe second reference voltage or the first power transistor is conducted. In this way, the problem that the overshoot duration of large-current transient response is long can be solved.

Description

technical field [0001] The invention relates to the technical field of power conversion, in particular to a step-down DC-DC converter. Background technique [0002] Although the Constant on-time (COT, constant on-time) step-down DC-DC (DC-DC) converter with a traditional structure has the advantages of good transient response, simple internal circuit, and fewer peripheral components, it also has The output voltage accuracy is not high enough. An important reason that affects the accuracy of the output voltage is the error caused by slope compensation. [0003] figure 1 It is a circuit schematic diagram of a conventional COT step-down DC-DC converter. Such as figure 1 , when the first power transistor (HSD_FET, sometimes called high power transistor) is turned on, the compensation ramp voltage generated by the ramp voltage generating circuit is set to zero. Such as figure 2 As shown, at very light load, after the first power transistor is turned on, it remains off for ...

Claims

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Application Information

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IPC IPC(8): H02M3/158H02M1/088H02M1/32
CPCH02M1/083H02M1/088H02M1/32H02M3/158H02M1/0025H02M1/0048Y02B70/10
Inventor 谢凌寒巩令风黄星星王国鹏汪东
Owner WUXI ETEK MICROELECTRONICS
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