JSSC 2011第9期Power Management130nmBuck Converter

A 90240 MHz Hysteretic Controlled DC-DC Buck Converter With Digital Phase Locked

提出一种基于数字锁相环的高频滞环控制DC-DC降压转换器，实现宽输出电压范围内的恒定工作频率。

90-240MHz, 33%-80%输出转换范围, 80%效率@180MHz, 40ns负载响应, <25mV纹波

DC-DC降压转换器数字锁相环滞环控制高频开关恒定频率

▸采用数字锁相环(D-PLL)实现频率锁定

▸消除开关频率对占空比或电压转换范围的依赖

▸可编程D-PLL参数并支持外部时钟同步

Abstract

This paper reports a digital phase locked loop (D-PLL) based frequency locking technique for high frequency hysteretic controlled dc-dc buck converters. The proposed con- verter achieves constant operat ing frequency over a wide output voltage range, eliminating the dependence of switching fre- quency on duty cycle or voltage conversion range. The D-PLL is programmable over a wide range of parameters and can be synchronized to a clock reference to ensure proper frequency lock and switching opera