Richtek Technology Corporation

Tsung-Hsi Yang

Isaac Y Chen

Chien-Fu Tang

Jiun-Hung Pan

Shao-Hung Lu

Wei-Haur Chan

An LED control device for configuring a phase-cut dimming system includes an LED and a switch. The LED control device configures the conduction status of the switch so as to supply power to the LED according to an input signal. The LED control device further detects whether the input signal is phase-cut. When the input signal is phase-cut, the LED control device stores the signal values of the internal circuits. Afterward, when the input signal is not phase-cut, the LED control device restores the stored signal values so that the internal circuits may resume to the previous operation status rapidly.

LED control device for phase-cut dimming system and control method thereof

A control circuit for a power converter has a current source, a sampling circuit, a signal processing circuit, a driving circuit, and a shared pin. The shared pin is used for coupling with a resistor and a switch. The current source, coupled with the shared pin, provides a current through the shared pin to the resistor in a first period. The sampling circuit, coupled with the shared pin, samples signals on the shared pin for generating a first sampling value and a second sampling value. The signal processing circuit, coupled with the sampling circuit, compares the first sampling value and the second sampling value. The driving circuit generates driving signals for conducting the switch. When the difference of the first sampling value and the second sampling value is less than a predetermined value, the signal processing circuit configures the driving circuit to intermittently conduct the switch in a second period.

Control circuit for power converter and method thereof

An adjustable driver voltage source for a switching power supply uses a linear regulator to provide a driver voltage, and a modulator to adjust the driver voltage according to the loading change of the switching power supply. The modulator may lower the driver voltage at light load to reduce the switching loss and thereby increase the power efficiency of the switching power supply.

Growing community of inventors

Taipei, Taiwan

Tsung-Hsi Yang