Richtek Technology Corporation

Richtek Technology Corpoation

Liang-Pin Tai

Jing-Meng Liu

Hung-I Wang

Jian-Rong Huang

Jiun-Chiang Chen

Hung-Der Su

Kuo-Ping Liu

Kent Huang

Shwu-Liang Hsieh

Cheng-Hsuan Fan

Ko-Cheng Wang

Tsai-Fu Chang

Yu-Fan Liao

Isaac Y Chen

Chung-Lung Pai

Chin-Hui Wang

Hsin-Hsin Ho

Chien-Fu Tang

Kwan-Jen Chu

Tzu-Chen Lin

Pei-Lun Huang

An-Tung Chen

Chao-Hsuan Chuang

Hung-Che Chou

Kuo-Lung Tseng

Der-Jiunn Wang

Chia-Jung Lee

Chung-Sheng Cheng

Ting-Hung Wang

Chun-Tsung Chen

Chien-Hui Wang

Kent Hwang

Chin-Chiang Yeh

Pao-Chuan Lin

Po-Shun Chung

Peng-Ju Lan

Jing-Mong Liu

An apparatus and method for output voltage calibration of a primary feedback flyback power module extract the difference between the output voltage of the power module and a target value, and according thereto, calibrate a reference voltage which is used in regulation of the output voltage, to thereby calibrate the output voltage to be the target value.

Apparatus and method for output voltage calibration of a primary feedback flyback power module

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

The duty of a PWM signal in a power converter is extracted to feed forward to modulate the slope of a linear oscillating ramp signal or the voltage level of an error signal, so as to modulate the duty of the PWM signal, by which the transient response of the power converter and the stability of the PWM loop both are improved.

Duty feed forward method and apparatus for modulating duty cycle of PMW signal and power converting method and power converter using the same

A per-phase quick response generation circuit generates a quick response signal to determine a quick response pulse to be inserted into a pulse width modulation signal of the corresponding phase. The quick response pulse will force the upper power switch of the corresponding phase on to increase the current supply ability during load transition. A multi-phase voltage regulator with the quick response generation circuit can have different quick response pulse widths for the interleaved phases, so as to decrease the current imbalance period of the voltage regulator after load transition.

Quick response width modulation for a voltage regulator

Duty feed forward method and apparatus for modulating a duty of a PWM signal and power converting method and power converter using the same

A method and apparatus are provided for a switching mode converter to improve the light load efficiency thereof. The converter is thus operated with three modes by monitoring a feedback signal and a supply voltage. When the feedback signal indicates that loading gets light enough, the converter is switched from the first mode to the second mode, and during the second mode some cycles are skipped. If loading is too light, the converter is switched from the second mode to the third mode, and during the third mode more cycles will be skipped.

Method and apparatus for improving the light load efficiency of a switching mode converter

A single-chip common-drain JFET device comprises a drain, two gates and two source arranged such that two common-drain JFETs are formed therewith. Due to the two JFETs merged within a single chip, no wire bonding connection is needed therebetween, thereby without parasitic inductance and resistance caused by bonding wire, and therefore improving the performance and reducing the package cost. The single-chip common-drain JFET device may be applied in buck converter, boost converter, inverting converter, switch, and two-step DC-to-DC converter to improve their performance and efficiency. Alternative single-chip common-drain JFET devices are also provided for current sense or proportional current generation.

Single-chip common-drain JFET device and its applications

A single-chip common-drain JFET device comprises a Drain, two gates and two source arranged such that two common-drain JFETs are formed therewith. Due to the two JFETs merged within a single chip, no wire bonding connection is needed therebetween, thereby without parasitic inductance and resistance caused by bonding wire, and therefore improving the performance and reducing the package cost. The single-chip common-drain JFET device may be applied in buck converter, boost converter, inverting converter, switch, and two-step DC-to-DC converter to improve their performance and efficiency. Alternative single-chip common-drain JFET devices are also provided for current sense or proportional current generation.

A control circuit provides a control signal for a constant on-time PWM switching converter to produce an output voltage, such that the converter operates with a constant on-time at a first state and operates with a variable on-time at a second state, so as to decrease the switching frequency and thereby the switching loss, to increase the efficiency of the converter, to improve the transient response, and to reduce the recovery time of the output voltage.

Control circuit and method for a constant on-time PWM switching converter

A semiconductor device package comprises a first semiconductor die having a first source region, a first gate region, and a first drain region attached on a first leadframe, a second semiconductor die having a second source region, a second gate region, and a second drain region attached on a second leadframe, and several pins electrically connected to the leadframes and source and gate regions. The second leadframe is electrically connected to the first source region. The pins connected to the first leadframe and second source region are on a side of the package, and the pins connected to the first gate region, second leadframe, and second gate region are on another side of the package.

Dual MOSFET package

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

For a DC-to-DC converter including a plurality of channels for converting an input voltage to an output voltage, a control circuit comprises a load transient detector to detect the output voltage to provide a quick response signal. In a load transient, the quick response signal triggers a quick transient response period to increase the operational frequency of the converter.

Control circuit and method for a DC-to-DC converter to improve transient response thereof

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Tainan, Taiwan

Liang-Pin Tai