一种用于大功率D类功率放大器的快速启动LDO  

A Fast Starup LDO for High Power Class D Power Amplifiers

作　　者：庄海孝[1] 马成炎[1,2] 叶甜春[1] 黄伟[1] 

机构地区：[1]中国科学院微电子研究所,北京100029 [2]杭州中科微电子有限公司,杭州310053

出　　处：《微电子学》2010年第3期334-338,342,共6页Microelectronics

摘　　要：D类放大器的输出级晶体管始终工作在开关模式,效率很高,在便携式电子领域得到广泛应用。采用CSMC 0.5μm BCD工艺,设计了一款应用于大功率D类放大器的低压差线性稳压器,对其结构和工作原理进行分析,重点讨论了各个关键电路模块的设计,改善了电源抑制比和启动时间。LDO的PSRR为100 dB@1 kHz,启动时间18μs,负载能力225 mA,工作电压范围5.5-18 V,最小压差0.5 V,温度系数54×10^-6/℃。With the advantage of high power efficiencey,Class D power amplifiers are widely used in portable devices.Based on CSMC＇s 0.5 μm BCD technology,a novel LDO regulator for Class D power amplifier was designed.The structure and operational principle were analyzed,and design of Key blocks in the circuit was described in detail.Measured results showed that the LDO circuit had a PSRR of 68 dB @ 1 kHz and a load current of 225 mA.It came to steady state within 18 μs.Operating from 5.5 V to 18 V,the circuit had a voltage dropout of 0.5 V and a temperature coefficient of 54×10-6/℃.

关 键 词：低压差线性稳压器 带隙基准源 功率放大器 D类放大器 

分 类 号：TP423[自动化与计算机技术] TN431.1[电子电信—微电子学与固体电子学]