Transitioning a power supply from a mode to another mode in response to a length of a portion of a current pulse

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United States of America Patent

PATENT NO 9866114
SERIAL NO

14479112

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Importance

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Abstract

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An embodiment of a power-supply controller includes a switching circuit and a transition circuit. The switching circuit is configured to generate a regulated output voltage by generating first current pulses at an approximately fixed frequency during a first mode, and generating second current pulses at a variable frequency during a second mode. And the transition circuit is configured to transition the switching circuitry from the first mode to the second mode in response to a length of one of the first current pulses. For example, a power supply may include such a power-supply controller to transition the supply from a PWM mode to a PFM mode under light-load conditions. To cause this transition at a predictable load point, the controller may monitor the lengths of the current pulses during the PWM mode, and may transition the supply to a PFM mode in response to the lengths being below a threshold.

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Patent Owner(s)

Patent OwnerAddress
INTERSIL AMERICAS LLC1001 MURPHY RANCH ROAD MILPITAS CA 95035

International Classification(s)

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Archibald, Nicholas San Francisco, US 4 28

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