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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...
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 new control method for H-bridge buck-boost converter regulated by single voltage feedback and dual feedforward controls. This converter has two pairs of the switch, one acts as a synchronous buck and another as a synchronous boost operations, and therefore is suited for battery powered applications to provide an output voltage that is below or above the input voltage. In order...
In order to have a power supply with high voltage conversion ratio for low voltage and high current digital ICs, this paper presents a new two stage converter combined with a coupling capacitor. A bottom switch of the first stage is removed and the switching nodes of the first stage and the second stage are coupled together by the coupling capacitor. The steady state analysis is performed and the...
A partial-resonant tapped-inductor converter with an auxiliary switch is proposed. The circuit construction is the same as a conventional tapped-inductor converter with active clamp circuit, but the drive timing for the auxiliary switch is different from the conventional one. As a result the output stability is improved as compared with the conventional active clamp one. Furthermore, zero current...
In this paper, a novel multi-stage converter with a coupled-inductor is presented in order to reduce the ripple currents in the switches and the output capacitor. The operating principle is described in detail and the steady state analysis is performed for a 12 V to 1.5 V prototype buck converter. From the experiments, it is confirmed that ripple currents in switches are greatly reduced and power...
A novel two-phase buck converter with two cores and four windings is proposed. In this converter, a capacitor is added to the primary side for dividing the input source voltage into one half in the similar way as that of a typical half bridge converter. The voltage conversion ratio is given as one fourth of the duty cycle with unity turns ratio of the each transformer. The output capacitor ripple...
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...
A novel tapped-inductor converter which has similar characteristics to a typical buck converter is proposed. A high step-down conversion ratio is achieved, and the magnetic core size of the tapped-inductor is minimized. The high side switch is easily driven by a usual driver IC without a pulse transformer. The over voltage load protection is inherently realized without any additional components. Furthermore...
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