Richtek Technology Corporation

Infineon Technologies Ag

Richtek Technology Corporation, R.o.c

Kuo-Lung Tseng

Jian-Rong Huang

Giuseppe Bernacchia

Giovanni Capodivacca

Chieh-Min Feng

Hung-Chun Peng

Wei-How Chan

Liang-Pin Tai

Dan Chen

Ching-Jan Chen

Yi-Cheng Wan

Chien-Hui Wang

Chun-Shih Huang

Maurizio Inversi

Liang Pin Tai

The present invention discloses an adaptive constant ON time adjustment circuit, which generates a square wave signal having a constant normal ON time during normal operation, for controlling a power stage circuit to convert an input voltage to an output voltage. When the output voltage is shifted from low to high, during the transient period, the ON time is adjusted longer; and when the output voltage is shifted from high to low, during the transient period, the ON time is adjusted shorter.

Adaptive constant on time adjustment circuit and method for adaptively adjusting constant on time

A voltage regulator includes an adjuster to provide an adjust signal according to its load current to adjust at least one of the feedback signal, the reference signal, the error signal, and the ripple signal of the voltage regulator, to automatically adjust the output voltage. The output voltage increases when the load current increases, and decreases when the load current decreases. Preferably, a CCR voltage regulator according to the present invention will have its PWM frequency varying with its output voltage and thus have better transient performance.

Voltage regulator having an output voltage automatically adjusted according to a load current

The present invention discloses a multi-phase power converter, and a control circuit and a control method of the multi-phase power converter. The multi-phase power converter comprises multiple power conversion phases. The method comprises: determining whether to enter a phase-shedding mode; at a first time when entering the phase-shedding mode, disabling at least one of the power conversion phases; and at another time when entering the phase-shedding mode, disabling at least another one of the power conversion phases.

Multi-phase power converter and control circuit and method thereof

The present invention discloses a buck switching regulator with improved mode transition, and a method for controlling a buck switching regulator. The method comprises: providing a switching regulator including: an output power stage for converting an input voltage to an output voltage, the output power stage being controlled by a first PWM signal during a fixed-frequency PWM mode (FPWM mode), and being controlled by a first voltage signal during a pulse skipping mode (PSK mode), wherein the first PWM signal is generated according to the first voltage signal; and in a transition from the PSK mode to the FPWM mode, proving a second voltage signal as a starting point of the first voltage signal, the second voltage signal being substantially close to a target of the first voltage signal in the FPWM mode.

Buck switching regulator with improved mode transition and control method thereof

The present invention discloses a switching regulator eliminating beat oscillation, comprising: a first transistor, a second transistor, and an inductor connected to a common node, wherein the first and second transistors operate to convert an input voltage to an output voltage; a comparator comparing a voltage signal with a saw tooth wave to generate a control signal controlling at least one of the first and second transistors; a feedback loop obtaining a feedback signal from the output voltage and generating the voltage signal according to the feedback signal; and an inductorless filter circuit located in the feedback loop for filtering a predetermined frequency band.

Switching regulator and method for eliminating beat oscillation

An output ripple control circuit and method for a PWM system uses a hysteresis threshold to clamp the output ripple of the PWM system such that the output ripple will not vary with the dc level of the output voltage, and therefore the output ripple control may be combined into any main loop technologies.

Output ripple control circuit and method for a PWM system

The subject matter is a voltage regulator capable of providing an indicator signal to a load, so that the load can operation under the best current-voltage relationship according to the indicator signal. To this end, the voltage regulator includes an amplifier for generating the indicator signal by amplifying a difference between a signal representative of an output voltage and a signal representative of a reference voltage.

Voltage regulator and method for generating indicator signal in voltage regulator

The present invention discloses a method and a circuit for reducing switching ringing in a switching regulator. The switching regulator comprises two transistors, and the two transistors are never simultaneously OFF. A phase lock loop may be provided to fix the output signal frequency of a PWM control circuit to a set frequency.

Method and circuit for reducing switching ringing in switching regulator

In a low-gain current-mode voltage regulator having a PWM comparator in response to the varying output voltage and inductor current of the voltage regulator to produce a PWM signal to regulate the output voltage, an offset signal is derived from a subtraction between the inputs of the PWM comparator, and the offset signal is injected into the PWM comparator to cancel the output offset of the voltage regulator.

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Lungtan, Taiwan

Kuo-Lung Tseng