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Würth Elektronik Watts Up Podcast


Dec 16, 2021

Chip bead ferrites are the best components for reducing high frequency noise above 10 MHz, but being the first components and the last components in the chain exposes chip bead ferrites to heavy transient currents. In this podcast, we discuss how circuit designers can now select parts that filter noise with minimal impact to power efficiency and will handle large current pulses with excellent reliability.

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Figure 1:

Generic DC-DC Converter with Chip Bead Ferrite Beads L1-L4 at the inputs and outputs

Figure 2:

Input inrush current of 33 A for a 12 VDC bus with a near-instantaneous connection charging 20 µF of

Figure 3:

Formula for comparing steady state input source current

Figure 4:

Comparison of unfiltered and filtered voltages and its filter effect to PARD noise