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The load transient (>100A load steps with >500A/us load slew rate) and the dynamic voltage transitions (>25mV/us transition rate) are the most two challenging controller performance requirements for multiphase voltage regulator (VR) design, especially when it is used to power the microprocessor. The hybrid ripple-based constant on-time control (COT) offers an inherent fast load transient...
Efficiency is one of the key performance factors for the multiphase voltage regulators (VRs), especially for the workstation and server applications. To further improve the efficiency, a new topology by having different phase inductances in multiphase VRs is proposed in this paper. However, the phase interleaving, current sharing, and dynamic phase shedding (DPS) functions would become more challenging...
These days, constant on-time current mode (COTCM) control schemes are widely used in the industry VR controllers for its light load efficiency and higher BW design with simpler compensation requirement. In COTCM control, external ramp is required to be added for jittering reduction to improve the noise performance of the controller. But unfortunately, with the increment of external ramp value, although...
This paper presents adaptive ripple-based constant on-time control architecture for buck converter ICs with wide duty ratio applications. An internal ramp compensation with emulating inductor current ripple is implemented to solve the ripple oscillation instability issue when using low-ESR output capacitors in buck converters. Therefore, no external compensation is required to simplify the system...
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