Charge pump led driver circuit

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 · The charge pump circuit uses the accumulation effect of the capacitor on the charge to store electrical energy. It uses the capacitor as an energy coupling element and controls the power electronic device to perform high-frequency switching, allowing the capacitor to store energy during a part of a period, and the capacitor releases energy during the Estimated Reading Time: 8 mins. Inductorless (Charge Pump) LED Drivers. Analog Devices has a very broad line of LED drivers for backlighting applications. They are configured as either inductorless white LED drivers (for LEDs in parallel) or inductor-based white LED drivers (for LEDs in series). Topologies include boost regulator LED drivers, buck regulator LED drivers, buck-boost LED drivers, and more. The low static power and high conversion efficiency charge pump LED driver circuit has been designed. The circuits nucleus module is adaptive charge pump (1x/x/2x charge pump), to converse a wider range of input voltage to a constant output voltage with high efficiency. This circuit only needs some external capacitors, and dont need inductor. So it reduces EMI Cited by: 1.

High Efficiency Charge Pump Converter / White LED Driver The NCP is an integrated circuit dedicated to the medium power White LED applications. The power conversion is achieved by means of a charge pump structure, using two external ceramic capacitors, making the system extremely tiny. The device supplies a. a 1×, ×, or 2× mode. The charge pump automatically switches between 1×/×/2× modes, based on the input voltage, to maintain sufficient drive for the LED anodes at the highest power efficiency. Improved brightness matching of the LEDs is achieved by a feedback pin to sense individual LED current with a maximum matching accuracy of 1%. The charge pump circuit uses the accumulation effect of the capacitor on the charge to store electrical energy. It uses the capacitor as an energy coupling element and controls the power electronic device to perform high-frequency switching, allowing the capacitor to store energy during a part of a period, and the capacitor releases energy during the remaining time.

Department of Electronics, Chungcheong University, Cheongju , Korea(Received Septem; Revised Novem; Accepted December 3. built-in charge pump eliminates the need for LED pre- The FAN includes built-in shutdown, short circuit Drivers. Pump. Voltage. Selector. Charge pump circuits are most useful for LED backlighting applications. Common applications include PCs, LCD displays, and automotive instrumentation. MCP