The NCP1379 hosts a high−performance circuitry aimed to
powering quasi−resonant converters. Capitalizing on a proprietary
valley−lockout system, the controller shifts gears and reduces the
switching frequency as the power loading becomes lighter. This
results in a stable operation despite switching events always occurring
in the drain−source valley. This system works down to the 4th valley
and toggles to a variable frequency mode beyond, ensuring an
excellent standby power performance.

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