Low-frequency EMI designs using WEBENCH® design tool

The WEBENCH input filter design tool helps you automatically design a proper input filter to mitigate lower-frequency (<30 MHz) conducted EMI noise for compliance standards like CISPR 32 and CISPR 25. The tool optimizes filter size while ensuring that the design complies with a particular standard. It also ensures filter stability and converter-loop stability while designing the filter. This online tool supports over 100 TI power devices.

It is a common mistake to leave an input EMI filter inductor undamped, which negatively affects overall design stability. The WEBENCH design tool performs impedance analysis on the input filter and SMPS (as shown in Figure 24) and suggests the appropriate damping component to ensure stability.