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出 处:《微电子学》2014年第5期592-596,共5页Microelectronics
基 金:国家高技术研究发展计划(863计划)重大项目(2012AA012305);国家自然科学基金面上项目(61271090);四川省科技支撑计划项目(2012GZ0101)
摘 要:提出了一种高压Buck转换器自举供电电路。该电路直接由芯片外部电源对自举电容充电,具有快速响应和大驱动电流等特点,满足大尺寸N型功率开关管的驱动要求。本设计适用于具有轻载高效模式的高压Buck转换器,在高端和低端开关管不工作时,能较好地对自举电容充电,解决了传统自举电路在低端管不工作时,无法稳定调节自举电压的问题。采用0.25μm UMC工艺库仿真,结果显示,只需满足输入电压要求,即使低端开关管不工作,且负载具有较高电压时,该电路也能将自举电压维持在3.6V以上,提高了转换器的可靠性。A novel bootstrap circuit was proposed for high-voltage buck converter. The bootstrap capacitor was charged directly by the chip's external power. The circuit featured fast response and high driving current, meeting the driving requirements of the N-type power switch with large size. In this bootstrap circuit, even though the highside and low-side switches did not work, the bootstrap capacitor also could be charged well. It was especially suitable for light-load and high-efficiency buck converters. The problem of the traditional bootstrap circuit can not adjust the bootstrap voltage stably while the low-side switch did not work was solved. Based on 0.25 μm UMC process, simulation results showed that as long as the input voltage was sufficient, even if the low-side switch did not work, and the load had a high voltage, the circuit could keep the bootstrap voltage above 3.6 V and improve the converter' s reliability.
分 类 号:TN433[电子电信—微电子学与固体电子学]
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