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A contribution to synchronization of the sliding-mode control-based integrated step-down DC/DC converter

Abstract : Mobile applications necessitate nowadays huge digital-resources. Power management of a digital System-On-Chip (SOC) is based on dynamic voltage scaling. DC/DC converters used to supply the digital SoCs are facing stringent constraints with respect to load-transients, line-transients and reference tracking. Hysteretic control is known as the most convenient control scheme with a fair trade-off between transient performances, analog implementation and power consumption, particularly for one-phase architecture. The thesis focuses on-board DC/DC with a significant constraint on footprint (i.e. on components count and values). Fixed switching-frequency hysteretic control has been experimented with significant results. Transient performances are reduced due to latency introduced in the switching frequency control. The present study focuses on the improvement of the concept as well as its implementation and the analysis of stability. A new analog implementation of the sliding-mode control is presented with switchingfrequency control using a particular analog phase-locked-loop but preserve transient performances. The DC/DC converter is implemented in CMOS 130 nm by STMicroelectronics. The switching frequency range has been voluntarily limited and excludes the possible integration of passive components for the sake of silicon access. A hybrid demonstrator is presented with efficiency higher than 80% between 2.4 mW and 960 mW output power.
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Submitted on : Tuesday, November 20, 2018 - 11:08:26 AM
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  • HAL Id : tel-01927902, version 1


Benoît Labbe. A contribution to synchronization of the sliding-mode control-based integrated step-down DC/DC converter. Micro and nanotechnologies/Microelectronics. INSA de Lyon, 2013. English. ⟨tel-01927902⟩



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