一种应用于DC-DC变换器中的片内电源电路
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摘要
介绍了一种应用在DC-DC变换器芯片中的片内电源电路。其核心是设计了一种带"浮地"结构的对称型跨导放大器电路,既可显著提高电路的瞬态响应速度,也减少了硬件成本,且电路结构简单、易于实现。此外,设计了一种片外电源检测电路,当存在片外5 V电源时,将其接入DC-DC变换器中作为片内主电源,提高了芯片效率。该片内电源电路已在基于0.5μm双极-CMOS-DMOS (BCD)工艺设计的DC-DC变换器中实现了验证,结果表明,采用该片内电源电路可实现宽输入电源范围、一定负载电流条件下的高精度5 V电源输出。DC-DC变换器芯片面积为2.00 mm×1.20 mm,片内电源模块面积仅为0.60 mm×0.40 mm。
An on-chip power supply circuit applied in DC-DC converters was designed. The core of the circuit was to design a symmetrical transconductance amplifier circuit with "floating ground" structure. The transient response speed of the circuit was significantly increased, while the hardware cost was reduced. And the circuit was simple and easy to be implemented. In addition, an off-chip power supply detection circuit was designed, which could be connected to the DC-DC converter as the on-chip main power supply when the off-chip power supply was 5 V. As the main power supply in the chip, the chip efficiency can be improved better. The on-chip power supply circuit was verified in a DC-DC converter based on 0.5 μm bipolar-CMOS-DMOS(BCD) process. The results show that the on-chip power supply circuit in the DC-DC converter can achieve high precision 5 V power supply output with wide input power supply range and a certain degree of load current. The area of the DC-DC converter chip is 2.00 mm×1.20 mm, and the area of the on-chip power module is only 0.60 mm×0.40 mm.
An on-chip power supply circuit applied in DC-DC converters was designed. The core of the circuit was to design a symmetrical transconductance amplifier circuit with "floating ground" structure. The transient response speed of the circuit was significantly increased, while the hardware cost was reduced. And the circuit was simple and easy to be implemented. In addition, an off-chip power supply detection circuit was designed, which could be connected to the DC-DC converter as the on-chip main power supply when the off-chip power supply was 5 V. As the main power supply in the chip, the chip efficiency can be improved better. The on-chip power supply circuit was verified in a DC-DC converter based on 0.5 μm bipolar-CMOS-DMOS(BCD) process. The results show that the on-chip power supply circuit in the DC-DC converter can achieve high precision 5 V power supply output with wide input power supply range and a certain degree of load current. The area of the DC-DC converter chip is 2.00 mm×1.20 mm, and the area of the on-chip power module is only 0.60 mm×0.40 mm.
引文
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[2] LIANG X G,WONG H,ZHOU X,et al.Evaluation of a new remote sensing method for onboard voltage regulator in computing system[J].IEEE Transactions on Power Electronics,2015,30(6):3057-3067.
[3] 张在涌,谭小燕,赵永瑞,等.一种用于DC-DC开关电源芯片的新型软启动电路 [J].半导体技术,2018,43(2):110-114.ZHANG Z Y,TAN X Y,ZHAO Y R,et al.A new soft start circuit for the DC-DC switching power supply chip [J].Semiconductor Technology,2018,43(2):110-114(in Chinese).
[4] SUN X F,SHEN Y F,LI W Y,et al.A PWM and PFM hybrid modulated three-port converter for a standalone PV/battery power system[J].IEEE Journal of Emerging and Selected Topics in Power Electronics,2015,3(4):984-1000.
[5] JAKUSHOKAS R,POPOVICH M,MEZHIBA A V,et al.Friedman,power distribution networks with on-chip decoupling capacitors [M].2nd ed.New York:Springer-Verlag,2011:34-40.
[6] LEE E S,CHOI B H,CHEON J P,et al.Temperature-robust LC3 passive LED drivers with low THD high efficiency and PF and long life[J].IEEE Journal of Emerging and Selected Topics in Power Electronics,2015,3(3):829-840.
[7] FORGHANI-ZADEH H P,RINCON-MORA G A.An accurate,continuous,and lossless self-learning CMOS current-sensing scheme for inductor-based DC-DC converters[J].IEEE Journal of Solid-State Circuits,2007,42(3):665-679.
[8] LIU P J,HSU C Y,CHANG Y H.Techniques of dual-path error amplifier and capacitor multiplier for on-chip compensation and soft-start function[J].IEEE Transactions on Power Electronics,2015,30(3):1403-1410.