| Along with the rapid development of science and technology, more and more technology products were applied widely, power supply products also have achieved rapid development, more and more power products applied to daily consumption areas such as computer, PDA, MP3, MP4, mobile phones, etc. Compared with the linear power supply, switching power supply's advantages of high efficiency and small make it development rapidly, with the changing market demand for products, DC - DC products's performance is higher and higher, many high performance requirements of various special requirements occur.This design uses the DC - DC peak current control mode, has a strong driving load and linear adjustment ability. In order to eliminate surge current and reduce the input voltage, with soft start-up circuit function, And through overvoltage and lowvoltage protection to prevent the higher or lower voltage happens. After a series of effective protection circuit ensures the stability and efficiency of the circuit. According to the theoretical calculation model for small signal, each function module theory parameters are designed, the parameters were simulated by the spectre of cadence, and the results showed that the circuit design meets various performance indicators and work fine . In the normal working condition it has 340KHz switching frequency, 14.75V-18V range of input, 0.923V-15V range of output voltage can adjustment rang. If occur any imdesirable condition any system is in a standby state. In practical circuit design, based on China ST3600 0.5 um 5V / 40V BCD process simulation, the design have done dc simulation, transient simulation, communication simulation, corner simulation. Finally, using Virtuoso layout of cadence and Dracula test tools design and text each moduleFinally, through computer simulation that the design result can satisfy the design requirement, and meet the demand of the market. |
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