The analysis of multi-phase current feedforward type-III constant on-time control with ultrafast load transient response for voltage regulator modules

2016 IEEE International Conference on Electronics, Circuits and Systems (ICECS) Pub Date : 2016-12-01 DOI:10.1109/ICECS.2016.7841167

B. AlMukhtar, Paul Harriman, K. Burke

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引用次数: 1

Abstract

This paper presents a new method of addressing the constant on time and minimal off time limitation of widely used COT variable frequency control. This is done by means of estimated capacitor current feedforward method. Ultrafast transient response is achieved with a new COT controller reacting much faster to output caps charge and discharge currents following a load transient step. A new output caps current estimator circuit is presented that accurately models a complex output filter network, including effective series inductance. System frequency response with combined output cap current estimator circuit and a type-II error amplifier shows a voltage mode type-III compensator. New compensator enables higher BW with sufficient phase margin limits. Dynamic performance of 4 phase, 3MHz and 16A load step at 3uSec slew rate show superior transient response in both voltage deviation and recovery time. Integrated controller is implemented in a 0.18μm Tower Jazz process. ASIC performance closely matches target design specs.

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稳压模块的多相电流前馈型超快负载瞬态响应恒准时控制分析

本文提出了一种新的方法来解决广泛应用的COT变频控制的常开时限和最小关断时限问题。这是通过估计电容电流前馈方法来实现的。超快的瞬态响应是通过一个新的COT控制器来实现的，在负载瞬态步骤之后，它对输出帽充电和放电电流的反应要快得多。提出了一种新的输出电容电流估计电路，该电路能准确地模拟包括有效串联电感在内的复杂输出滤波器网络。结合输出帽电流估计电路和ii型误差放大器的系统频率响应显示为电压模式iii型补偿器。新的补偿器使更高的BW具有足够的相位裕度限制。4相、3MHz和16A负载步长在3uSec压转率下的动态性能在电压偏差和恢复时间上都表现出优异的瞬态响应。集成控制器采用0.18μm Tower Jazz工艺。ASIC性能接近目标设计规格。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2016 IEEE International Conference on Electronics, Circuits and Systems (ICECS)

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