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A novel frequency hopping technique is proposed to increase the efficiency in a switched-capacitor LED driver, based on analyzing the dependence of power loss on switching frequency. LEDs' load current is featured uniquely by jumping periodically from a constant value (20mA) to zero for dimming function. Developed on an improved VCO, the hopping technique makes the switching frequency vary discretely...
A monolithic controller for pulse width modulation (PWM) DC-DC converter was presented in this paper. The controller was designed specially for LED (light emitting diode) driver circuit with four operation modes, current feedback mode, constant current mode, no sense resistor mode and PWM dimming mode. The controller can be adapted to almost all current DC-DC topologies such like Boost, Buck-Boost...
A novel high efficiency high integration green converter with on-chip power switch and on-chip current sensing technique was proposed in this paper. By adopting PWM/BURST multi-mode operation, its conversion efficiency is enhanced over the entire load range. Using it, the light-load and standby power dissipation of modern portable products powered by batteries is reduced, which results in prolonging...
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