摘要
提出了一种适用于多相同步降压型DC/DC稳压器的高增益误差放大器。为解决DC/DC稳压器在多相级联驱动同一个负载时电流不能均分的问题,在主从控制法基础上设计了差分驱动电路,保证各级误差放大器输出电压绝对值相等。同时设计了内外补偿电路,对稳压器在不同工作方式下进行补偿。基于0.18μm BCD工艺对电路进行仿真,仿真结果表明,电源电压为3.3 V时,误差放大器增益为69.47 dB、相位裕度为49.99°、动态输入范围为0~0.62 V。测试结果表明,负载电流为10 A时,并联稳压器输出电感电流为5 A、相位差为180°,且稳压器具有较好的稳定性。
A high gain error amplifier for a multiphase synchronous step-down DC/DC regulator was proposed.In order to solve the problem that the current could not be equally shared when the multiphase cascade DC/DC regulator drived the same load,the differential drive circuit was designed based on the master-slave control method to ensure the absolute values of the output voltages of the error amplifiers were equal.Internal and external compensation circuits were designed to compensate the regulator in different working modes.The circuit was simulated based on a 0.18μm BCD process.The simulation results show that when the power supply voltage is 3.3 V,the error amplifier gain is 69.47 dB,the phase margin is 49.99°,and the dynamic input range is 0~0.62 V.The test results show that when the load current is 10 A,the output voltage of the shunt regulator is 5 A,the phase difference is 180°,and the regulator has good stability.
作者
李新
朱红萍
赵正超
洪婷
张美娟
LI Xin;ZHU Hongping;ZHAO Zhengchao;HONG Ting;ZHANG Meijuan(School of Information Science and Engineering,Shenyang University of Technology,Shenyang,110870,CHN;Beijing Galleric Electronics Inc,Beijing,100071,CHN)
出处
《固体电子学研究与进展》
CAS
北大核心
2020年第2期131-137,共7页
Research & Progress of SSE
关键词
误差放大器
电流均分
多相级联
内外补偿
error amplifier
current sharing
multiphase cascade
internal and external compensation
