| With the rapid development of integrated circuit design technology and semiconductor manufacturing technology, more requirements have been put forward from the power supply, including smaller size, higher efficiency etc. In this circumstance, a single inductor multiple output (SIMO) converter was designed in this thesis, which not only can guarantee the performance of the electronic components, but also can decrease the power loss of the circuit, provide stable output voltage over wide supply voltage range, and keep high efficiency whether the load is light or heavy. The converter in this thesis is SIMO converter which can well meet the need of these above. This circuit is used in power supply for Organic Light-Emitting Diode (OLED).A circuit is proposed in this thesis to meet all needs listed above, whose supply voltage is 2.3V~5.5V. It can provide a fixed 4.6V positive output voltage and an adjustable negative output voltage down to -6V. Line regulation and load regulation are improved by adopting Buck-Boost topology and peak-current control mode. The circuit can switch between discrete conductance mode (DCM) and continuous conductance mode (CCM) automatically according to different load conditions and this can keep high efficiency in wide range of load.In this thesis, basic theories of Buck-Boost converter are introduced firstly, including operation principles, modeling of the converter, peak-current control mode, synchronous rectification and modulation modes; Secondly, the idea and the design of the whole circuit are analyzed and the parameters and characteristics are also listed; Thirdly, sub-modules are designed based on the whole function of the chip, which are charged by me, including zero-crossing detector, mode switching and oscillators. The functions and the characteristics of the sub-modules are validated in terms of HSPICE; in the end, the functions of the whole circuit are simulated and verified, whose results meet the original design objects well. |
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