Monolithic Power Systems, Inc.

Chengdu Monolithic Power Systems Co., Ltd.

Huan Liu

Yu-Huei Lee

Zheng Luo

Junjian Zhao

Chia-Lung Ni

Junyong Gong

Shuai Yuan

Peijian Ding

A USB power supply circuit is discussed. The circuit has at least two power converters and a controller. The controller controls the power converters to provide required output powers to devices attached to the controller and monitors the provided output powers. If one of the power converters has an idle power margin, the idle power margin would be distributed to other power converters.

USB power supply circuit with idle power distribution and the method thereof

An LED driving system for synchronizing two LED driving integrated circuits to drive LED strings. The LED driving system sequentially activates the LED strings driven by the first LED driving integrated circuit and then outputs a downstream enabling signal from the first LED driving integrated circuit to the second LED driving integrated circuit to activate the LED strings driven by the second LED driving integrated circuit.

Led driving system with communication between multiple integrated circuits

A feedback control circuit in an LED driving circuit for driving a plurality of LED strings. Each LED string provides a headroom detecting voltage. The feedback control circuit has a status detecting circuit, a counting circuit and a modulating circuit. The status detecting circuit compares each headroom detecting voltage with a low headroom threshold voltage and a high headroom threshold voltage and generates an up self-status signal and a down self-status signal. The counting circuit counts or keeps unchanged and then generates a counting signal based on the up self-status signal and the down self-status signal. The modulating circuit generates a modulating signal based on the counting signal. And based on the modulating signal, the feedback control circuit generates a feedback control signal to regulate a bias voltage supplying the plurality of LED strings.

Adaptive feedback control in LED driving circuits

An LED driving system with a master-slave architecture. The LED driving system has at least two LED driving circuits which both have a first status detecting circuit, a second status detecting circuit and a first feedback control circuit. The first status detecting circuit receives a plurality of headroom detecting voltages provided by a plurality of LED strings and generates at least one self-status signal. The second status detecting circuit receives a downstream feedback signal and generates at least one downstream status signal. The first feedback control circuit generates a first feedback control signal based on the at least one self-status signal and the at least one downstream status signal. The second status detecting circuit of one LED driving circuit is coupled to the first feedback control circuit of the other LED driving circuit.

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Chengdu, China

Huan Liu