| As the high performance DC/DC converter is widely applied in the consumer electronics such as portable and smart personal devices in recently years. To meet the specifications of promising small and mediate size portable OLED drivers, a novel architecture DC/DC converter, i.e. the self-adaptive with feedforward PWM control scheme, is proposed in this paper base on the studies and analysis of the currently existing DC/DC architecture and technology. The utility of advanced self-adaptive feedback technology allows the system always operates under optimum condition and yields the high accurate output voltage with the rapid response towards the sudden load change. The impact of the input voltage fluctuation to the output voltage is also minimized by feedforward technology. The combination of the both feedforward and feedback technology realizes a precise and fast DC/DC converter.The system model is firstly analyzed with calculation and optimization of system parameters to demonstrate self-adaptive capability of the system. Base on that, the stable state control system, self-adaptive learning machine, accumulation error correction system, and the PWM generator are respectively described and analyzed in detail. The system possesses excellent load and line regulation characteristics and fast transference between the different operation conditions.Base on the novel architecture, an entire DC/DC converter IC is build with the additional accessory blocks including an oscillator with the frequency of 1.38MHz, a reference with the voltage of 1.203V, and a high efficiency synchronous rectification driving circuit, etc. The system allows the reliable operation at the input and output range of 2.7V~5.5V and VIN+0.5~15V, respectively. The Hspice simulation result indicates that the recover period is very short as the sudden input or output change. The output voltage error is able to approach zero at stable state. Additional, the output ripple is less than 0.1% of the output voltage. |
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