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This white LED Driver circuit project is based on the NCP5680 high efficiency white LED Driver ic. NCP5680 supports double power flash LED and torch operation . The built-in DC/DC converter is based on a high efficient charge pump structure with 1X, 1.5X and 2X operating modes. The NCP5680 controller is designed to properly drives large external NMOS device with accurate control of the peak current flowing into the LED. Also, the NCP5680 chip includes Open Load and Overload Detection circuit to protect the system against faults at Vout or LED level. High Efficiency White LED Driver Circuit diagram Main features of the NCP5680 are : 2.7 to 5.5 V Input Voltage Range , Dual Power Flash LED Capability , Integrated Overload Protection , Selectable Flash/Torch Mode of Operation , Programmable SuperCAP Re−cycling Current , Capable to Share the DC Voltage to Supply Peripheral Circuits , Indicator LED Function , Integrated Photo Sense Function , Support Camera Strobe , Built−in Short Circuit Pr...

Nano-electronics research center imec announced today at Intersolar Europe, a new efficiency record for its large area n-type PERT (passivated emitter, rear totally diffused) crystalline silicon (Cz-Si) solar cell, now reaching 22.5 percent (calibrated at ISE CalLab). It is the highest efficiency achieved for a two-side-contacted solar cell processed on six inch commercially available n-type Cz-Si wafers without the use of passivated contacts. N-type silicon solar cells are considered as promising alternatives to p-type solar cells for next generation highly efficient solar cells thanks to their ability to withstand light-induced degradation and to their higher tolerance to common metal impurities. [ ]