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The fixed on-time with bottom detection control having ripple injection has become very attractive due to practical usage and realization of ceramic capacitor solution for output while keeping ultra fast transient response. This paper presents quantitative analysis by introducing averaging method in comparator operation for the transfer function. As a result, the frequency response characteristic...
In order to reduce power consumption of electronic equipment in stand-by mode, idle-mode and sleep-mode, a simple efficiency improvement technique for switching regulator in light load region is proposed. During the light load, small switching elements in a MOSFET driver circuit are used instead of switching elements in a main regulator circuit to reduce switching and driving losses. Of course, during...
This paper introduces a novel simulation algorithm for closed loop frequency response analysis by Fourier Transform Method (FTM). FTM is reviewed briefly and novel analysis algorithm is described. The simulator employing this novel algorithm is developed and demonstrated for a buck converter with feedback. The simulation result is in good agreement with the experimental result.
This paper presents a constant frequency hysteretic PWM controlled buck converter. In order to have good transient responses for input voltage and load current changes, a new PWM control method with inherent derivative characteristics is proposed. The proposed PWM controller consists of a comparator, a simple RC network and operational amplifier, and it can be synchronized with an external clock signal...
A derivative PWM control method with constant switching frequency strong against incoming switching noise is proposed. The triangular voltage obtained from a simple RC network as a comparator input is employed to determine the duty ratio and an external clock signal is used to fix the switching frequency. Applying the proposed method to the buck converter, excellent dynamic performances and stable...
This paper presents more exact model and practical measurement method of capacitors for voltage regulator (VR) applications. A simple two-stage RC ladder model of the capacitor is introduced and each parameter is extracted in a time domain measurement by employing a large dc discharge current with high current slew rate during switching. Based on the equivalent ladder model, the capacitance and equivalent...
DC-DC converters with a novel hysteretic PWM controller are presented. A novel feedback network is proposed which behaves as a PID controller. Fast transient response and no steady state error of the output voltage are achieved. Steady state and dynamic analysis are performed and confirmed by experimental results for a 5 V to 1.5 V prototype buck converter. As a result, no steady state error on the...
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