A SIDO buck switch converter and a digital control method thereof

Abstract

The invention discloses a SIDO buck switch converter and a digital control method thereof. The converter includes a sampling module, A / D conversion module, error calculation module, PID control module, CCB frequency conversion control module, gate driving logic circuit and PWM module. The sampling module converts an analog signal into a discrete signal, then converts the analog signal into a digital signal by A / D conversion module, and inputs the digital signal to error calculation module. The PID module determines the duty cycle of the new switching cycle according to the error value. The PWMmodule outputs a corresponding PWM signal according to the value of the duty cycle, and the driving circuit determines the on-off of the switch transistor and adjusts the output voltage value. The CCB frequency conversion control module judges whether the frequency conversion control is adopted or not, and when the output current changes, the system returns to the steady state by adjusting the input power. The invention reduces the cross interference of two branches of the switch converter, improves the dynamic response of the switch converter and improves the steady-state performance of thesystem.

Description

technical field [0001] The invention relates to the technical field of isolated DC-DC converters, in particular to a SIDO buck switching converter and a digital control method thereof. Background technique [0002] With the rapid development of technology, especially the breakthrough development of portable devices, such as smart phones, tablet computers, and various wearable devices, the requirements for the integration of electronic devices are getting higher and higher. System on chip (SoC) is a system composed of multiple processing units packaged on the same chip. The SoC contains a variety of processing units, and different units require different operating voltages. Therefore, a battery management module is required to supply power to each unit. The traditional solution is to use multiple independent power sources to power it, so there are multiple external inductors and multiple power transistors. [0003] In order to save chip area and pins, and reduce external fi...

AI Technical Summary

Problems solved by technology

In the current power management, in order to obtain relatively high efficiency, a multi-mode control method is generally selected, which will lead to a decline in the dynamic performance of the power supply and cannot meet the increasingly high dynamic performance requirements.

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