Optimization Of Control Circuit Used In Peak Current-mode Converters

The switching power converters ever-increasingly replace traditional linear power supply due to its small space, light weight, low power dissipation, high efficiency, adoption and broad applicability, etc. Because the design of power supply refers to switching control, analog IC, power transistor and things of that maters, research on the switching power supply has profound theory values and application values, which also becomes the highlight of the referring research areas.The primary design challenges of the switching power supply is the feedback control part of the converter. This paper represents the design and optimization of the feedback control part of the switching power converter.This paper firstly brings forward the non-ideal model of the converter, which figure out the transfers function of the small signal, and thus brings out the performance parameters determining feedback control circuit. At last, optimize the performance parameters. The primarily optimizations are the optimization of the stable precision of the reference voltage, which is implemented by divided compensation which reduces the temperature parameter of reference voltage. The optimization of current sense precision, which increases current sense precision and reduces power dissipation. And the optimization of Reduce the delay of PWM comparator and driver, and increase driving ability.