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This paper proposes dynamic ramp control in current-mode adaptive on-time control for Buck converter on chip. It improves system stability and reduces output voltage at the load release. The concept of dynamic ramp control uses sample and hold circuit, comparator, and ramp valley control circuit adjusted according to the varied ramp signal to avoid the generation of an error pulse signal to regulate...
A novel quick response of ripple-based constant on-time with virtual inductor current ripple for Buck converter is proposed in this paper. The concept uses the capacitor and the resistor in a series to filter out the output voltage at load transient to dynamically change the width of on-time to prevent the from dropping markedly. Finally, 12-V input voltage, 3.3-V output voltage, and 60-W...
A one-cycle control based constant frequency operating trailing-edge continuous conduction mode (CCM) boost type power factor correction (PFC) IC with instant-switch-current control is proposed. By using a level shift circuit, this PFC controller can be operated using unipolar supply voltage. Moreover, the functions of leading edge blanking (LEB) and over voltage protection (OVP) are integrated into...
A single-stage three-phase AC-DC converter is presented in this paper. The front semi-stage of the proposed converter, which is operated in discontinuous conduction mode (DCM), is utilized for power factor correction and the rear semi-stage of the proposed converter, which is operated in continuous conduction mode (CCM) at heavy loads and in DCM at light loads, is employed for step-down voltage conversion...
To decrease the power consumption of a switching power supply, the most effective approach is to lower the switching frequency. Hence, the current mode pulse-width-modulation (PWM) controller used in a switching regulator must be capable of frequency modulation at light-load condition. The green mode circuit is designed in proposed current mode PWM control IC with the concept of off-time modulation...
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