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The difficulty of modeling a resonant converter is the fact that, unlike a pulse-width-modulation (PWM) converter, an average concept doesn't work. The only successful equivalent circuit model, proposed by E. Yang, is based on fundamental approximation and harmonic balance theory. However, it is conceptually hard to understand because of an unidentified “equilibrium state.” A resonant converter was...
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...
These days inductor current ripple based ‘current mode constant on time (CMCOT)’ control is widely used in voltage regulators (VRs) for its higher light load efficiency, higher bandwidth and simple compensation network. In today's VRs, high load current with very high slew rate is a very common requirement in microprocessor or memory applications. One issue of this ripple based CMCOT control is that,...
In $V^{2}$ control, the direct feedback contains the information of the inductor current, the capacitor voltage, and the load current. In this paper, by separating the current feedbacks and the capacitor voltage feedback, an equivalent circuit of $V^{2}$ control with ESR dominant output capacitor is proposed. The proposed equivalent circuit is based on the unified equivalent circuit of current mode...
A novel switched-capacitor voltage divider was proposed in the previous work. It can achieve 1kW/in3 power density, 98% efficiency and has been demonstrated in system two-stage power architecture for laptop. However, the transient performance of the voltage divider remains unclear. In this paper, the small-signal average model of the voltage divider is presented firstly. It analytically demonstrates...
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