Large-Signal Stability Guarantees for

Stability guarantees are critical for cycle-by-cycle controlled dc-dc converters in consumer electronics and energy storage systems. Traditional stability analysis on these converters is incomplete as it considers inductor current ramps fixed, whereas they depend on output voltage in large-signal transients. This paper presents a new large-signal stability theory treating these converters as a specific feedback interconnection system. The authors provide an analytical and practical stability criterion based on this framework, revealing the L/R and RC time constants as key design parameters influencing the coupling between current ramp and output voltage. The focus is primarily on current-mode dc-dc converters, which are widely used in point-of-load regulators and battery management systems. A comparison reveals that existing large-signal stability analysis typically treats the current and voltage blocks as decoupled, potentially leading to inadequate stability assessments. The findings contribute significantly to the understanding of large-signal dynamics in current-mode controlled converters, addressing gaps in existing literature and offering practical insights for design improvements.