摘要
提出了一种高效率绿色模式降压型开关电源控制器芯片的设计,特点是采用PWM/Burst多模式控制策略提高全负载条件下的电源转换效率.由于降低了低负载和待机条件下的电源功耗,可减小由电池供电的现代便携式设备的静态功耗,延长设备的待机时间和电池的寿命.芯片还实现了模式转换过程中的平滑过渡以及过冲电压的抑制.此外,还引入一种高精度、高效率的片上电流检测技术,进一步降低了功耗.该芯片在1.5μm BCD(bipolar-CMOS-DMOS)工艺下设计和制造,测试结果表明芯片已达到预期的性能要求.
A novel green mode switch mode power supply （SMPS） buck regulator with an on-chip power switch is proposed. By adopting PWM/Burst multi-mode operation,its conversion efficiency is enhanced over the entire load range. It reduces the light-load and standby power dissipation of modern portable products powered by batteries, which results in prolonging their standby time and battery lifetime. Moreover, a seamless transition is successfully realized by over voltage suppression. In addition, an on-chip current sensing technique with high precision and efficiency has been introduced into the control strategy to improve its efficiency further. The regulator is designed and fabricated in 1.5μm BCD （Bipolar-CMOS-DMOS） technology. The test results show that all expected performances are achieved.
基金
国家自然科学基金(批准号:90707002)
浙江省自然科学基金(批准号:Z104441)资助项目~~
