| The use of electric energy greatly improves the quality of life. However, people can’t make full use of the power energy during a long period. It led to the serious waste of energy. The continuous pursuit of improving the efficiency of power has led to the generation and development of power management chip. Due to the rapid development of integrated circuit technology, full control device which takes MOSFET as the representative appears,promoting the development of the power management device in the direction of high frequency and small in size. It provides condition for the miniaturization of power supply chip.Although LDO is low in cost and small in noise, it is large and the power conversion efficiency is not high. Operating in switching mode, switching power supply produce only a little cost, which contributes higher efficiency. With the increase of the switching frequency, the size of the converter can be very small. In view of these advantages, dc switching power supply has been widely recognized and used in power field. The chip we design operates in peak current mode, which increases the speed of response. We can add pulse to the pin of the chip to test its index, for it includes a test module. The paper describes the basic topology structure and working mechanism of the chip. In addition to oscillator module, reference circuit module, the paper pays attention to the loop stability of the compensation network. As the parameters of semiconductor devices change in a certain range, the first two modules of the chip were added the trim circuit to ensure the stability of the overall performance of the chip.Based on the project of dc switching mode power supply for the key laboratory of integrated circuits, the dc-dc switching power supply chip which is based on 0.5μm cmos process is designed by this paper. Each module circuit and the core circuit of the chip is simulated by spectre Simulation results show that the performance of the chip has reached the requirements of the design. |
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