A Current-Mode DC-DC Boost Converter with Fast Transient and On-Chip Current-Sensing Technique

摘要

Objectives: Design of a converter with high accurate feedback system is the objective of this paper. Statistical analysis: Design of a current-mode CMOS DC-DC boost converter with fastest settling time and less quotient current with a feedback control is presented. Efficient compensation with soft-start is used to make the quotient current low. An on-chip current-sensing circuit is introduced with less number of I/O pins for current-mode control. The design is carried out in CADENCE Virtuoso, and simulation results show successful working of DC-DC boost converter. Findings: The system is designed using 0.18 urn, 5 V supply CMOS technology. With wide range of loads, it provides 25 V at the output, 50 mA load current with 90% efficiency. Circuit is operated at 500 kHz clock frequency with output ripple voltage of 21 mV by using 4.7 μF off-chip capacitor and 55 μH off-chip inductor. Improvements: Design of converter in current-mode control with high accurate current-sensing technique increases the controllability on PWM signal. Modified OTA design helps in the fast settling of the converter.