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Würth Elektronik Watts Up Podcast


Oct 28, 2021

Choosing the appropriate components is vital for the efficiency of DC/DC switching regulators with relatively high input and output currents. A high-efficiency switching regulator is market-ready if it, and the end product, comply with all necessary EMC standards; meaning more filters must be included at the input and output to reduce interference. With high input and output currents, it is difficult to find a compromise between the efficiency, size, damping and cost of the filter, and the actual performance level. In this podcast, based on an Application Note, we use the example of a 100 W buck-boost DC/DC design to outline the considerations, layout and components necessary to find such a compromise. Download the Application Note, ANO049- EMC & Efficiency Optimization of High Power DC/DC Converters, at www.we-online.com/appnotes or click here.

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Figure 1:

Formula For Required Capacitances

Figure 2:

EMC-optimized layout of the top layer for the buck-boost converter

Figure 3:

 EMC-optimized layout of the bottom layer of the buck boost converter with four power MOSFETs

Figure 4:

Measurement of conducted interference without an input filter

Figure 5:

Simulated differential insertion attenuation with parasitic characteristics of the two filter banks