Analysis of Constant On-Time Buck Converter with System Verilog Real Number Model Approach

Constant On-Time buck converter with ripple injection architecture is proposed to improve efficient power conversion and voltage offset addition minimizes the overshoot with the improvement of poor light-load efficiency proposed by Zhou [6]. It can extend the battery life of some common application like smart camera, Point-of-load converter for laptops, etc. The simulation results show load regulation is maintained with 1% accuracy and maximum error (-6.25%) in switching period occurs at VIN = 4.25V, VOUT = 0.6V, FSW = 1.25MHz, ILOAD = 5A and significant amount of reduction in voltage deviation after enabling the control functions with proper load step-up and step-down, respectively. Output voltage ripple is within 17mV with Undershoot and Overshoot values across all combinations is under 34mV.