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2. A Novel Start-Up Technique for Time-Based Boost Converters with Seamless PFM/PWM Transition

Author

Rosa, Tommaso, Leoncini, Mauro, Ghioni, Massimo, and Levantino, Salvatore

Subjects
Control theory, Buck converter, Computer science, Electronic engineering, Feedback loop, Converters, Multiplexing, Pulse-width modulation, Compensation (engineering), Voltage
Abstract

Time-based techniques are proven to reduce the area of the compensation networks of DC-DC converters when compared to their voltage mode counterparts. To maximize the converter efficiency both at heavy and light load, the converter controller also needs to seamlessly switch from a PWM to a PFM control. While buck converters are inherently stable during start-up, boost converters might enter a latched-up state and thus require a dedicated start-up controller, which often makes use of bulky components increasing the overall area. To overcome this issue, we present a start-up mechanism for time-based boost converters. The proposed solution makes use of the time-based feedback loop and seamless PFM/PWM transition circuit to implement the start-up functionality without requiring any extra circuitry or off-chip components.

Published
2020

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