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Error amplifier for large-current DCDC power supply module

An error amplifier and power module technology, applied in the field of error amplifiers, can solve the problems that the output end of the error amplifier cannot be used as the secondary main pole and cannot meet the needs of the application, so as to ensure the stability of the system, increase the transconductance, and reduce the output. The effect of resistance

Pending Publication Date: 2022-08-02
西安航天民芯科技有限公司
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Problems solved by technology

[0004] However, the pole at the output end of the error amplifier in the prior art cannot be used as the sub-dominant pole, which cannot meet the requirements of the application

Method used

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  • Error amplifier for large-current DCDC power supply module

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Embodiment

[0038] The invention provides an error amplifier with large transconductance, which is applied to a high-current DCDC power supply module. Technically, by increasing the transconductance of the error amplifier and reducing the output resistance, the pole position of the output end of the error amplifier is far away from the origin position, As the secondary main pole of the power module system, it ensures the stability of the system.

[0039] The specific implementation form of the error amplifier with large transconductance in this embodiment figure 1 As shown, the circuit consists of two parts, the first part is the soft-start circuit, and the second part is the main circuit of the error amplifier.

[0040] In the soft-start circuit, the soft-start port voltage VSS is a ramp voltage formed by charging the capacitor with current. When the soft-start voltage VSS is lower than the reference voltage VREF, the reference voltage VREF is pulled down, and the reference voltage VREF ...

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Abstract

The invention discloses an error amplifier for a large-current DCDC power supply module. The error amplifier comprises a soft start circuit and an error amplifier main circuit. The soft start circuit is used for stabilizing rising voltage during starting; the error amplifier main circuit is used for comparing the feedback voltage VFB with the reference voltage VREF, and the error amplifier main circuit and the compensation capacitor form a secondary dominant pole far away from the original point. The error amplifier is applied to a large-current DCDC power module, the pole position of the output end of the error amplifier is far away from the original point position and serves as a secondary dominant pole of a power module system by increasing the transconductance of the error amplifier and reducing the output resistance technically, and the system stability is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of switching power supplies, in particular to an error amplifier for a high-current DCDC power supply module. Background technique [0002] With the scale expansion of electronic systems and the substantial increase in computing power, especially the application of high-quality image acquisition, processing, and transmission, the power supply of electronic systems requires greater load capacity and faster transient response speed. Modern electronic systems such as ASICs, FPGAs, and processors in high-performance communications, servers, and computing systems require core power supplies that can generate 1.0V (or lower) directly from 12V or intermediate buses, and require the power supply to provide up to ten Load capacity of several amps or even hundreds of amps. [0003] As we all know, the current-mode DCDC converter usually contains two poles and one zero, and the corresponding zero and pole positions ar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F3/16
CPCH03F3/16Y02B70/10
Inventor 孙权夏雪王婉王勇袁婷闫鹏程
Owner 西安航天民芯科技有限公司
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