Adaptive transient response optimization circuit for peak current mode dc-dc converters

Abstract

The invention relates to an adaptive transient response optimization circuit suitable for peak current mode DC-DC converters, belonging to the technical field of electronic circuits. The present invention adaptively regulates the size and direction of the output transient enhanced current signal according to the actual situation of the feedback voltage and the reference voltage of the peak current mode DC-DC converter, and combines the generated current signal with the inductor current sampling signal and the slope compensation signal Superimposed, the resistance is converted into a voltage signal and then input to the positive input of the PWM comparator. From the perspective of large signals, the adjustment speed of the original system loop is accelerated during the load step, and the transient response of the system is optimized. Compared with the traditional transient response optimization circuit, the present invention can adaptively provide the transient enhanced current signal related to the output voltage change, has the characteristics of low noise and more stable system, and can effectively improve the transient response speed of the system.

Description

technical field [0001] The invention belongs to the technical field of electronic circuits and relates to an adaptive transient response optimization circuit suitable for peak current mode DC-DC converters. Background technique [0002] Currently, there are increasing demands on load current and fast output transient response in many aspects of DC-DC converter applications. In order to address the fast switching of loads under different application conditions, it is necessary to enable the output of the power supply to have a fast load response capability to meet this requirement. [0003] The traditional method of transient response optimization is generally to optimize the system loop at the small signal level to optimize the loop characteristics under different load conditions. However, traditional methods often only optimize at specific load points, and in actual use, DC-DC converters usually have many different load conditions, including different input and output volt...

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Problems solved by technology

[0004] Aiming at the problem of slow transient response of the DC-DC converter system caused by different loads or input and output in the traditional specific load point optimization method, the present invention proposes an adaptive transient response method suitable for peak current mode DC-DC converters. State response optimization circuit, according to the feedback voltage V of the DC-DC converter FB and reference voltage V REF The change adaptively changes the size and direction of the generated current, and is connected with the inductor current sampling signal I SENSE and slope compensated output signal I SLOPE superimposed and converted into a voltage signal V through the resistance S Then it is input to the positive input terminal of the PWM comparator, which speeds up the adjustment speed of the original DC-DC converter system loop during the load step from the perspective of large signals, and optimizes the transient response of the system

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