Low Power Digital Alternative to Analog Control of Step-Down Converter
Power-aware design of digital controller for step-down converter is discussed and compared to a standard analog counterpart so as to verify the feasibility in System-on-Chip. A tri-mode digital controller IC in 0.35 μm CMOS process is presented to demonstrate such a solution
including a PID, a so-called quarter PID and a robust RST compensator. The compensators respectively address the steady-state, stand-by and transient modes according to the operating conditions of the step-down converter. An idle-tone free condition for the Σ – Δ DPWM is
considered to reduce the inherent tone noise under DC-excitation while generating a quasi-pure modulation signal compared to a traditional approach. Experimental results verify closed-loop performances and lead to a power assessment model suggesting feasible applications.
Keywords: CMOS INTEGRATED CIRCUIT; DC CONVERTER; DC– DIGITAL CONTROL; DIGITAL PULSE-WIDTH-MODULATOR; SYSTEM ON CHIP
Document Type: Research Article
Publication date: 01 December 2012
- The electronic systems that can operate with very low power are of great technological interest. The growing research activity in the field of low power electronics requires a forum for rapid dissemination of important results: Journal of Low Power Electronics (JOLPE) is that international forum which offers scientists and engineers timely, peer-reviewed research in this field.
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