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With the development of electronic technology , more and more extensive applications of electronic systems , more and more types of electronic equipment , power requirements more flexible . Miniaturization and cost reduction of the electronic apparatus so that the power to light, thin , small and high efficiency as the direction of development . In this paper a new switching power supply circuit of the PWM (pulse width modulation) , and it has a circuit is relatively simple , less constituent elements , low power consumption , low conversion loss , wide range of applications and other characteristics . Paper , the authors first introduced to the work of the PWM , then follow the VLSI design methods , design the overall framework of , and ministries molecular module of the circuit , functional simulation for each sub-module .
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