Controller of multi-phase switching converter and control method thereof

Abstract

The invention discloses a controller of a multi-phase switching converter and a control method thereof. The control method comprises the steps: sampling multiple output currents of a switching circuit to generate multiple current sampling signals; filtering multiple current sampling signals to generate corresponding multiple filtered signals; generating multiple first reference signals and multiple second reference signals according to multiple filtered signals and a ripple threshold signal; outputting multiple fault signals according to the comparison result of each current sampling signal with the first reference signal and the second reference signal; and adjusting the control signal of the corresponding phase switching circuit based on multiple fault signals. When the value of the current sampling signal is between the first reference signal and the second reference signal, the fault signal is logic low; and when the fault signal remains logic low for more than the preset period of time, the control signal of the corresponding phase is adjusted to become logic low and the corresponding switching circuit is controlled to stop operation.

Description

technical field [0001] The present invention relates to electronic circuits, and more particularly, to a multiphase converter and its controller, control method and fault detection method. Background technique [0002] In recent years, multi-phase switching converters have been widely used in high-performance CPU power supplies due to their superior performance, and CPU-related circuits play a central role in the entire application system. The high reliability of CPU power supplies is a feature that technicians pay special attention to. During the working process of the whole multi-phase switching converter system, how to accurately find the phenomenon of aging or damage of a certain phase or some switching circuits, and skip the corresponding phase as quickly as possible, or cut off the work logically Circuit, so that the whole circuit can continue to work is a problem that technicians are more and more concerned about. [0003] The traditional method is to open the phase-...

AI Technical Summary

Problems solved by technology

However, this solution will cause short-term uneven current when the load is dynamic. In order to prevent misjudgment, it takes a long time to judge, and in order to ensure that there is no wrong phase cut, the threshold value is relatively large, and the phase current detection accuracy is high. Misjudgment is also prone to occur when the phase current detection accuracy is not enough

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