Richtek Technology Corporation

Mediatek Singapore Pte. Ltd.

Richtek Technology Corporation, R.o.c

Richtex Technology Corp.

Cheng-Hsuan Fan

Chao-Hsuan Chuang

Hung-Che Chou

Ching-Hsiang Yang

Chih-Ping Tan

Jing-Meng Liu

Kent Hwang

Liang-Pin Tai

Jian-Rong Huang

Chien-Hui Wang

Yung-Chih Yen

Hao-Ping Hong

Man Pun Chan

Shui-Mu Lin

Tzu-Chen Lin

Pei-Lun Huang

Ko-Cheng Wang

Kuo-Ping Liu

Yu-Fan Liao

Yu-Fen Liao

A feedback loop circuit of a voltage regulator includes a loadline and a compensation circuit. The loadline generates a feedback signal according to a sensed current signal that provides information of an inductor current of the voltage regulator, and outputs the feedback signal to a controller circuit of the voltage regulator for regulating an output voltage of the voltage regulator. The compensation circuit generates a compensation signal to compensate for a deviation of the output voltage, wherein the feedback signal generated from the loadline is affected by the compensation signal.

Apparatus and method for applying dynamic compensation to feedback signal generated from loadline of voltage regulator

A sub-circuit of a voltage regulator includes a load condition detection circuit and a controllable circuit. The load condition detection circuit is arranged to detect a load transient frequency of a load powered by the voltage regulator, and generate a control signal according to a detection result of the load transient frequency. The controllable circuit is arranged to receive the control signal, wherein an operational behavior of the controllable circuit dynamically changes in response to the control signal.

Apparatus and method of performing load transient frequency detection for dynamically managing controllable circuit in voltage regulator

A feedback circuit for an isolated power converter includes an opto-coupler and a reversed polarity regulator. The opto-coupler provides a current related to an output voltage of the isolated power converter. When the isolated power converter enters light load, the output voltage rises and the reversed polarity regulator reduces the current to decrease the power consumption and thus improve the light load efficiency of the isolated power converter.

Feedback circuit and control method for an isolated power converter

A flyback voltage converter includes a transformer having a primary winding and a secondary winding, a switch serially connected to the primary winding for being switched to produce a current in the secondary winding, and a negative lock loop to adjust the peak value of the current in the secondary winding according to a current conduction time during which the current in the secondary winding is higher than a current threshold, such that the peak value of the current in the secondary winding will be in inverse proportion to the time.

Negative lock loop and control method for a flyback voltage converter

An apparatus and method for reducing the die area of a PWM controller include a protection circuit triggered by a fault index signal for counting, and the counting time is provided for a delay time required by fault verification. Therefore, fault detection circuits can be eliminated and the purpose of reducing the die area can be achieved.

Apparatus and method for reducing the die area of a PWM controller

The present invention discloses a half-voltage headphone driver circuit, comprising: at least one operational amplifier providing an output to a headphone speaker, and a charge pump receiving a supply voltage (VDD), generating a positive half-voltage and a negative half-voltage (VDD/2 and &#x2212;VDD/2) based on the supply voltage, and supplying the positive half-voltage and negative half-voltage as high and low operation levels to the at least one operational amplifier.

Half-voltage headphone driver circuit

For protecting a power system, two or three of over current, thermal and under voltage protection circuits are integrated as one protection circuit but operate independently, and one or more protection points thereof are adjusted dynamically in response to detected condition of the power system. Specifically, using voltage and current conditions in the power system to modify the over current protection and the thermal protection maximizes the performance of the power system and covers the process bias in the circuits.

Arrangement and method for an integrated protection for a power system

The present invention discloses a load-dependent frequency jittering circuit, comprising: a load condition detection circuit for receiving a switching signal and generating an output according to a load condition; a number generator for receiving the output of the load condition detection circuit and generating a number; a digital to analog converter for converting the output of the number generator to an analog signal; and an oscillator for generating a jittered frequency according to the output of the digital to analog converter.

Load-dependent frequency jittering circuit and load-dependent frequency jittering method

A linear voltage regulator comprises a transistor for converting a supply voltage to an output voltage. By directly monitoring the supply voltage and thereby rapidly responding when the supply voltage suffers a ripple, the linear voltage regulator enhances the stability of the output voltage.

High PSRR linear voltage regulator and control method thereof

Time-sharing technique is used for power conversion to improve the thermal dissipation thereof. In a power supply arrangement to provide a supply voltage to a load, a plurality of linear regulators are so switched that each time only one of them is enabled to convert an input voltage to the supply voltage, thereby each of them suffering less thermal dissipation.

Thermal dissipation improved power supply arrangement and control method thereof

A flyback converter has a controller to switch a power switch so as to convert an input voltage to an output voltage for a load by monitoring an output voltage dependent signal and a current sensing signal derived from a current flowing through the power switch, a light-load efficiency improving apparatus monitors the load and a supply voltage provided for the controller to selectively clamp the output voltage dependent signal when the load is lower than a first threshold value and the supply voltage is lower than a second threshold value, so as to increase the supply voltage.

Light-load efficiency improving method and apparatus for a flyback converter

A frequency jittering control circuit wherein by means of the characteristics of a PLL whose input switches between different frequencies, the output frequency of the PLL swings between the different frequencies to achieve the desired frequency jittering.

Frequency jittering control circuit and method for using the same

The present invention discloses a charge pump start up circuit comprising: a start up transistor having one end which is electrically connected with a voltage supply source, and another end which is electrically connected to a voltage node; and a charge pump circuit having an input which is electrically connected with the voltage node, and an output which is electrically with the gate of the start up transistor.

Charge pump start up circuit and method thereof

In a synchronized data communication on a one-wired bus, it transmits and receives a synchronizing signal that segments part of or all proportions of the data signal by use of three electrically distinguishable statuses for the identifier of the synchronizing signal and the logic states of the data signal to increase the endurance of frequency displacement and resist influences of the interference of external conditions, low quality of transmission medium, and limitation of transmission distance and make the reliability and correctness of the signal transmission improve substantially. It is also clearly illustrated the feasibility and simplicity for implementing the one-wired synchronized communication by a plurality of exemplary signal types and a transceiver circuitry.

Growing community of inventors

Hsinchu, Taiwan

Cheng-Hsuan Fan