Abstract: A fault protection and correction circuit for the control of a power converter is disclosed. An example circuit generates a waveform that drives a switch on or off and controls the power converter. The controller circuit in addition to power factor correction (PFC) circuitry includes a first and a second shut down mode modules, both of them cause the switching to stop. The circuit includes a module for receiving fault events. When a fault occurs, the controller enters the second shut down mode. The controller stays in the second shut down mode if the required current for this mode can be provided by the outside circuitry. Otherwise, the controller enters the first shut down mode that requires less current and subsequently restarts the controller. By modifying the outside circuitry the controller can respond differently to fault events.

Abstract: A circuit for driving light emitting elements, such as LEDs, includes a first transistor having a source coupled to ground through a first resistive element, and a second transistor having a gate electrically coupled to a gate of the first transistor, a source electrically coupled to ground, and a drain for electrical connection to a first group of light emitting elements. The circuit also includes circuitry to provide a predetermined voltage at the source of the first transistor, circuitry to compensate for a difference in respective gate-source voltages of the first and second transistors, and circuitry to compensate for a difference in respective drain-source voltages of the first and second transistors. In some implementations, the circuit can achieve relatively low power consumption.

Abstract: A fault protection and correction circuit for the control of a power converter is disclosed. An example circuit generates a waveform that drives a switch on or off and controls the power converter. The controller circuit in addition to power factor correction (PFC) circuitry includes a first and a second shut down mode modules, both of them cause the switching to stop. The circuit includes a module for receiving fault events. When a fault occurs, the controller enters the second shut down mode. The controller stays in the second shut down mode if the required current for this mode can be provided by the outside circuitry. Otherwise, the controller enters the first shut down mode that requires less current and subsequently restarts the controller. By modifying the outside circuitry the controller can respond differently to fault events.

Abstract: A circuit for driving light emitting elements, such as LEDs, includes a first transistor having a source coupled to ground through a first resistive element, and a second transistor having a gate electrically coupled to a gate of the first transistor, a source electrically coupled to ground, and a drain for electrical connection to a first group of light emitting elements. The circuit also includes circuitry to provide a predetermined voltage at the source of the first transistor, circuitry to compensate for a difference in respective gate-source voltages of the first and second transistors, and circuitry to compensate for a difference in respective drain-source voltages of the first and second transistors. In some implementations, the circuit can achieve relatively low power consumption.

Abstract: A circuit for driving light emitting elements, such as LEDs, includes .a first transistor having a source coupled to ground through a first resistive element, and a second transistor having a gate electrically coupled to a gate of the first transistor, a source electrically coupled to ground, and a drain for electrical connection to a first group of light emitting elements. The circuit also includes circuitry to provide a predetermined voltage at the source of the first transistor, circuitry to compensate for a difference in respective gate-source voltages of the first and second transistors, and circuitry to compensate for a difference in respective drain-source voltages of the first and second. transistors. In some implementations, the circuit can achieve relatively low power consumption.

Abstract: The ambient light sensor structure includes a power supply, a converter, and a pulse processing unit. The power supply provides a reference voltage interface, a high voltage interface and a low voltage interface. The converter includes a first current-to-pulse converter, a second current-to-pulse converter, a first light sensor and a second light sensor. The pulse processing unit comprises a signal subtraction component for circuit blocking, a counter, a digital-to-analog converter and a buffer by series connection. Without incident light, two light sensors would produce a dark current due to the material characteristics of the two photo diodes. Therefore, two current to pulse converters convert the dark current into a pulse signal and transmit the pulse signal to the signal subtraction component in order to cancel the dark current. By the method mentioned above, the dark current caused by the material characteristic of the two light sensors can be eliminated.

Abstract: An ambient light sensor structure and its circuit characteristic are disclosed, and the ambient light sensor structure includes a power supply, a converter, and a pulse process unit. The power supply is to provide a reference voltage interface, a high voltage interface and a low voltage interface. The converter includes a first current to pulse converter, a second current to pulse converter, a first light sensor and a second light sensor. The pulse process unit comprises four circuit blocking with a signal subtract component, a counter, a digital to analog converter and a buffer by series connection. Without incidence light, two light sensors would produce a dark current due to the material character of two photo diodes. Therefore, two current to pulse converters convert the dark current into a pulse signal and transmit the pulse signal to the signal subtract component in order to cancel the dark current.