Abstract
This study presents a new virtual inductor current circuit to reduce circuit complexity, which is not necessary to sense inductance current directly. The buck converter was designed to produce an output voltage of 1.0–2.5 V for a 3.0–3.6 V input voltage. The load current range was from 100 mA to 500 mA. It was simulated and verified by SIMPLIS and MathCAD. The simulation results of this buck converter show that the voltage error is within 1%, and the recovery time is smaller than 2 ms for step-up and step-down load transients. Additionally, it achieves less than 26 mV overshoot at full-load step transient response. The circuit topology would be able to fabricate using TSMC 0.35 mm 2P4M CMOS technology. The control mechanism, implementation, and design procedure are presented in this paper.
Highlights
Nowadays, the DC–DC buck converter is widely used in mobile phones and other portable electronic devices [1]
The the variable switching frequencyduty can improve thelimited efficiency it willdurandAlthough control logic. This causes the maximum cycle to be by in theDCM, ON time main disadvantage of the constant on-time (COT) control scheme is the limitation of the duty cycle
MathCAD, and of thetheBode plot of the compensator is drawn in tionthe intoequation
Summary
The DC–DC buck converter is widely used in mobile phones and other portable electronic devices [1]. The the variable switching frequencyduty can improve thelimited efficiency it willdurandAlthough control logic This causes the maximum cycle to be by in theDCM, ON time main disadvantage of the COT control scheme is the limitation of the duty cycle. AOT current-mode control; to input/output voltage to realize virtually constant-frequency operation, which is known as adaptive on-time control scheme is shown slope compensation is not needed. A sensorless solution, which uses a predicmayStudies not be suitable for low-power conversion in the literature proposed a sensorless solution, which uses a predictive method to estimate inductor current. The ACS senses the voltage across the inductor and converts by Chen et al. Electronics 2020, 9, x FOR PEER REVIEW In Figure 5, an active current-sensing (ACS) technique was 4 ofproposed.
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