Pseudo-V2 control with adaptive compensation for fast-transient current-mode buck converter
A type of pseudo-V2 control, with on-chip adaptive compensation to achieve fast transient (FT) response for current mode DCDC buck converter, has been proposed and simulated using 0.18?m CMOS technology in this paper. Based on a new on-chip capacitor multiplier, adaptive compensation is achieved by making the compensation capacitance to track the load current. The proposed pseudo-V2 control utilizes the output ripple to determine the duty cycle during load transient. Thus the overshoot/undershoot voltage and the transient recovery time are effectively reduced. Simulation results demonstrate the transient ripple is smaller than 50mV and the transient recovery time is shorter than 10?s for a 450mA load current step. The maximum power conversion efficiency is 94.6% at 1MHz switching frequency when input and output voltages are 5V and 1.8V, respectively.
adaptive compensation buck converters fast transient capacitor multiplier v2 control