Monolithic Power Systems, Inc.

Panyin Liu

Jian Jiang

Lei Li

Di Han

Wei Mao

Xiangyi Yang

Li Wang

A switch circuit includes a first audio input pin configured to receive a first audio signal having a first amplitude, a second audio input pin configured to receive a second audio signal having a second amplitude, an input pin, an output pin, and at least one switch configured to convert the input voltage to the output voltage. When a maximum of the first amplitude and the second amplitude is lower than a first threshold voltage, the output voltage is a default voltage. When the maximum of the first amplitude and the second amplitude is greater than the first threshold voltage but lower a second threshold voltage that is greater than the first threshold voltage, the output voltage is a first voltage greater. When the maximum of the first amplitude and the second amplitude is larger than the second threshold voltage, the output voltage is a second voltage.

Fast and dynamic vout-tracking control for audio input signal

An isolated resonant converter has an analog comparator with hysteresis for generating a first ON/OFF signal, a digital isolator for outputting a second ON/OFF signal, an oscillator for providing a clock pulse signal with a frequency, and a primary pulse width modulator coupled to receive the clock pulse signal and the second ON/OFF signal. An output voltage of the isolated resonant converter is controlled by the analog comparator within a predefined range. The second ON/OFF signal is electrically isolated from the first ON/OFF signal. The primary pulse width modulator controls the switching of the isolated resonant converter in response to the clock pulse signal during the logic high state of the second ON/OFF signal and stops the switching of the isolated resonant converter during the logic low state of the second ON/OFF signal.

Isolated resonant converter with fixed output ripple

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Chengdu, China

Panyin Liu