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The efficiency impact of air-cored inductors used close to and beyond its cut-off frequency in multi-MHz converters is investigated. A method is presented to determine the converter switching frequency that causes the lowest losses in a given inductor. Influential parameters are analysed to optimize an inductor for a predefined switching frequency.
Substrate coupling is a critical failure mechanism especially in fast-switching integrated power stages controlling high-side NMOS power FETs. The parasitic coupling across the substrate in integrated power stages at rise times of up to 500ps and input voltages of up to 40V is investigated in this paper. The coupling has been studied for the power stage of an integrated buck converter. In particular,...
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