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采用SMIC 0.18μm CMOS工艺,设计了一种应用于电流型DC-DC转换器的斜坡补偿电路。基于FVF结构,电路能动态地检测输入和输出电压,并将该电压差转换成电流,产生自适应斜坡电压,不仅提高了DC-DC转换器的补偿精度,还避免了高占空比下的过补偿,提高了系统在高占空比下的带负载能力。仿真结果表明,在5V工作电压下,输出电压工作范围为1~4.5V,即占空比最高可达90%,最大负载可达1A。
A SMIC 0.18μm CMOS process is used to design a slope compensation circuit for a current-mode DC-DC converter. Based on the FVF structure, the circuit can dynamically detect the input and output voltages and convert the voltage difference into current to produce an adaptive ramp voltage, which not only improves the compensation accuracy of the DC-DC converter but also avoids the need for high duty cycle Overcompensation improves the system’s ability to carry loads at high duty cycles. The simulation results show that the output voltage range of 1 ~ 4.5V at 5V working voltage, that is, the duty cycle can reach 90% and the maximum load can reach 1A.