JSSC 2021第8期Power Management0.18µm CMOSBoost Converter

A 10-MHz Current-Mode AOT Boost Converter With Dual-Ramp Modulation Scheme and T

提出一种双斜坡调制方案和基于TLL的谷电流传感器，用于提升10MHz电流模式AOT升压转换器的效率和稳定性。

峰值效率94.5%，开关频率10MHz，芯片面积1.23mm×1.37mm

升压转换器电流模式控制双斜坡调制谷电流传感器自适应导通时间

▸双斜坡调制方案解决DCM不稳定性

▸基于TLL的谷电流传感器提升响应速度

▸自适应导通时间(AOT)发生器实现准固定开关频率

Abstract

In this article, a dual-ramp modulation scheme is proposed to solve an instability during the discontinuous conduction mode (DCM) operation of current-mode constant on-time (COT) controlled boost converters. A duty cycle- dependent auxiliary waveform, which is generated by the proposed capacitor-coupled common-drain ampliﬁer (CCCDA), is summed with an inductor current information to form a current feedback loop. With the proposed scheme, the pulse frequency modulation (PFM) operation can be spon