Power Supply Control Circuit Design Based On UC3846Switch

With the development of society, electronic products have been deep into the lives of everyone, and electronic products are inseparable from the corresponding kinds of power. Voltage control type switching power supply in all kinds of electronic products is extensive, but the voltage control type switching power supply has its own shortcomings, such as poor stability, response speed can not keep up requirements, short life, even in high-power the application changes, signal interference caused the failure of the power tube damage. Both practical and reliable switching power supply, the need for core control circuit module the entire switching power supply can really achieve reliable key.The design uses a double-ended output current control chip UC3846, as relatively stable core of the switching power supply controller. By analysis and calculation of the peak current control mode, and the current control mode the outer voltage signal sampling and the inner current signal samples as well as a simple and effective slope compensation circuit and a driver circuit, over current protection circuit, the magnetic pass balance, load regulation and dynamic response of a high speed, the inner loop current loop stability. Finally, according to the experimental results show that, the based on UC3846core of switching power supply control circuit having a good stability and reliability.