提高带载能力的高稳定性自适应斜坡补偿电路

提出一种新颖的精确自适应斜坡补偿电路, 与传统的自适应斜坡补偿电路不同, 该电路不仅引入了输入、输出电压, 还引入了电感电流和开关管导通阻抗的乘积, 从而实现补偿量的自动调节和精确控制, 提高了DC-DC转换器的带载能力和瞬态响应, 同时更好地保证了系统的稳定性. 基于该结构采用0.35μm CMOS工艺设计实现了一款面积为1.8×1.8 mm2的Boost DC-DC转换器芯片. 测试结果表明, 该转换器工作状态良好, 占空比从15%～90%变化时, 电感电流最大值变化量小于6.5%.

Adaptive Slope Compensation Circuit with High Stability for Improving Load Capability

A novel and exact adaptive slope compensation circuit is proposed in this paper. Compared with traditional adaptive slope compensation circuits, the proposed structure not only introduces input and output voltages but also does the product of the inductor current and the on-resistance of the power transistor, which achieves self-regulation and precise control of the compensation amount, thus improving the load capability and transient response of the DC-DC converter and forcefully guaranteeing the system stability. A boost dc-dc converter of 1.8×1.8 mm2 chip area using the proposed structure is designed and implemented with a 0.35μm CMOS process. Experimental results show that the converter is good in performance and the variation of maximum inductor current is less than 6.5% with the duty cycle ranging from 15% to 90%.