Onsemi NCP1339C | Demoboard NCP1339CGEVB

Description

The NCP1339 is a highly integrated quasi−resonant flyback controller capable of controlling rugged and high−performance off−line power supplies as required by adapter applications. With an integrated active X−cap discharge feature and power savings mode, the NCP1339 can enable no−load power consumption below 10 mW for 65 W notebook adapters. The quasi−resonant current−mode flyback stage features a proprietary valley−lockout circuitry, ensuring stable valley switching. This system works down to the 6th valley and toggles to a frequency foldback mode to eliminate switching losses. When the loop tends to force below 25 kHz frequencies, the NCP1339 skips cycles to contain the power delivery. To help build rugged converters, the controller features several key protective features: an internal brown−out, a non−dissipative Over Power Protection for a constant maximum output current regardless of the input voltage, a latching−off over voltage protection through a dedicated pin. This application note focuses on the experimental results of a 45 W adaptor driven by the NCP1339.

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