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A hardware efficient optimum-deviation voltage mode controller with a fast and noise-insensitive detection of the key voltage waveform points during load transients is introduced. To reduce the effects of noise and delays on the detection, a two extreme point detector with a voltage tracking window is introduced. In addition, an on-line algorithm for the compensation of load-dependent duty ratio variations...
The output-voltage-derivative term of a proportional-integral-derivative (PID) controller injects significant noise in a dc-dc converter. This is mainly due to the presence of parasitic resistance and inductance of the output capacitor. Particularly during a large-signal transient, noise injection significantly degrades phase margin. Although noise characteristics can be improved by reducing the cut-off...
The main goal of this work is to de-couple the well-known efficiency/dynamic-response trade-off involved in scaling the inductance in dc-dc converters. This is achieved by introducing a low-cost auxiliary phase having an optimally scaled-down inductor and power-stage. The auxiliary phase is activated by a digital non-linear controller only during large transient events and thus does not affect the...
This paper presents an oversampled digital controller IC for low-power switch-mode power supplies (SMPS) that achieves fast response with a minimized addition of switching losses due to its control actions. To reduce the voltage deviation and improve converter response time, the controller samples the output voltage four times per switching cycle. A single voltage sample is processed by the conventional...
Fast load transient response and high power conversion efficiency in DC-DC converters have conflicting requirements on the size of the inductor. In this paper, an integrated point-of-load (POL) DC-DC converter with an smaller auxiliary output stage added in parallel to the main output switching stage to help reduce the output voltage deviation during load transient is investigated. The transistor...
Digital peak current (DPC) control, digital peak voltage (DPV) control, and digital peak voltage/peak current (DPV/DPC) control of buck converter with leading-edge modulation are studied and compared in this paper. The AC small signal transfer functions of control-to-output, input-to-output and output impedance are derived and the corresponding comparison studies are performed. Transient simulation...
Based on digital controllers offering significant advantages in DC-DC converters, this paper proposes a digital PWM controller for single-inductor dual-output (SIDO) switching converter operating in discontinuous-conduction mode (DCM). By adopting time-multiplexing (TM) scheme, this converter provides two independent supply voltages using only one inductor, which is suitable for portable devices and...
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