Asymmetric inductors in multi-phase DCDC converters
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United States of America Patent
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Sep 19, 2017
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app pub date -
Oct 14, 2013
filing date -
Oct 7, 2013
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Abstract
A multi-phase DC-to-DC converter is configured to achieve fast transient response and to optimize efficiency over the load range. Phase shedding changes the active number of phases according to output currents. Each phase of the converter has an inductor configured to optimize the efficiency for a range of load currents in which that phase is used. A converter may have 3 phases, the first used only in sleep mode and has a large inductance with low AC losses, the second used in sync mode at low currents and having a lower inductance with low AC losses, the third phase is used in sync mode at high currents and has small inductance with low DC losses. The number of phases is ≧2.
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