| dc.description.abstract |
As designs of portable electronic products are developed toward being light, thin, short, small and multi-functional, making the power consumption and power density of the products are relatively increased. While using a variety of product features, it also represents that a large amount of load changes is required, especially when using communication network functions. The development of power management chips have become saturated because of the technology of high conversion efficiency, and gradually develop toward the rapid response and high power density. On the one hand, the power management chip must provide a stable output voltage in accordance with the requirements of the system load to make the system work; on the other hand, the size of electronic product gradually reduced; the power management chip must be limited in the wiring area with the fewest of parts to meet system requirement. Therefore, how to make the power management chip with functions of fast transient response and to reduce the number of parts used has become a very important issue.
In this study, a ripple voltage control buck converter with fast transient response output was designed, and it also has the advantage of using fewer parts. We proposed that by detecting the changes of output voltage to adjust the operating frequency, adjust the circuit to obtain the output voltage changes, and adjust the power transistor conduction cycle appropriately to tune the output voltage level and enhance the load regulation. The operating voltage range of the chip is 2.5V ~ 4.6V, the operating frequency is 1MHz and the output voltage is 1V. When the external inductance is 1.2uH and the external capacitance is 330uF, the chip is able to supply a buck converter with load range 0.01A ~ 1A, the Ripple size of output voltage 10mV, and 1% of the output voltage error, and in the study we also proposed a set of circuit design process to complete the circuit simulation. It is therefore possible to ensure that the optimum circuit design is required to meet the applicable specifications under suitable components and parameters. Therefore, according to the converter and the design process described above, a chip with a fast response, low number of parts and optimized parameters are completed to meet the need of increase in system function and power density. | en_US |