Abstract:

This paper introduced the necessity of current-mode control in switching power and analyzed the disadvantages of the traditional current sampling method.Based on the analysis and calculation of inductive current,a current sampling circuit current design with miniaturization and low power consumption was proposed.Physical verification was carried out according to this theory.A DC/DC power module with input voltage of 5~24 V and output voltage of 3.3 V was designed,which verifies the stability and reliability of the design.

Key words: switching power, current sampling, miniaturization, low power consumption