Richtek Technology Corporation

Realtek Semiconductor Inc.

Yu-chang Chen

Kun-Yu Lin

Ta-Yung Yang

Hsin-Yi Wu

Shih-hsiung Huang

Jun Yang

Chia-Hsien Yang

Fu-Ciao Syu

A resonant flyback power converter includes: a first and a second transistors which form a half-bridge circuit for switching a transformer and a resonant capacitor to generate an output voltage; a current-sense device for sensing a switching current of the half-bridge circuit to generate a current-sense signal; and a switching control circuit generating a first and a second driving signals for controlling the first and the second transistors. The turn-on of the first driving signal controls the half-bridge circuit to generate a positive current to magnetize the transformer and charge the resonant capacitor. The turn-on of the second driving signal controls the half-bridge circuit to generate a negative current to discharge the resonant capacitor. The switching control circuit turns off the first transistor when the positive current exceeds a positive-over-current threshold, and/or, turns off the second transistor when the negative current exceeds a negative-over-current threshold.

Resonant flyback power converter and switching control circuit and method thereof

A resonant asymmetrical half-bridge flyback power converter includes: a first transistor and a second transistor switching a transformer coupled to a capacitor for generating an output power; a voltage divider coupled to an auxiliary winding of the transformer; a differential sensing circuit which includes a first terminal and a second terminal coupled to the voltage divider to sense an auxiliary signal generated by the auxiliary winding for generating a peak signal and a demagnetization-time signal; and a PWM control circuit configured to generate a first PWM signal and a second PWM signal in accordance with the peak signal and the demagnetization-time signal, for controlling the first transistor and the second transistor respectively; wherein a period of an enabling state of the demagnetization-time signal is correlated to the output power level; wherein the peak signal is related to a quasi-resonance of the transformer after the transformer is demagnetized.

Resonant AHB flyback power converter and switching control circuit thereof

A time-interleaved analog-to-digital converter (TIADC) operates in a first mode or a second mode and includes M analog-to-digital converters (ADCs), a reference ADC, a digital correction circuit, and a control circuit. The M ADCs sample an input signal according to M enable signals to generate M digital output codes. The reference ADC samples the input signal according to a reference enable signal to generate a reference digital output code. The digital correction circuit corrects the M digital output codes to generate M corrected digital output codes. The control circuit generates the M enable signals and the reference enable signal according to a clock. The control circuit outputs the M corrected digital output codes in turn but does not output the reference digital output code in the first mode and randomly outputs the M corrected digital output codes and the reference digital output code in the second mode.

Time-interleaved analog-to-digital converter

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HSINCHU, Taiwan

Yu-chang Chen