A design for increasing the immunity to RFI of protection IC of lithium-ion battery

Illustrated by the case of a lithium-ion battery protection IC, the paper focuses on the design of internal immunity to RFI. With analysis of the chippsilas three major elements of electromagnetic compatibility (EMC), the qualitative and quasi-quantitative analysis results of RFI influence to the chip are given out. By using a simple filter circuit and available material physical construction which can isolate, absorb and consume the RFI energy, the protection ICpsilas electromagnetic susceptibility has been reduced effectively. The simulation of the devised structure in the time domain is gained by Winspice, and tool IC_EMC makes it possible of the conversion from time domain to frequency domain in which the spectrum analysis is completed. The design has passed the simulation verification and the layout implement of the devised construction designed is also available.