●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 latched over voltage protection through a dedicated pin.
●Features | | Benefits
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● Loss-free Adjustable Over Power Protection
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● Limits the peak current according to input line voltage
● Latched / Autorecovery Timer-Based Overload Protection
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● Short circuit protection for improved reliability
● Brown Out Protection
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● Protects against drops in input mains voltage
● High voltage startup current source
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● Provides a quick and lossless power-on sequence
● Active Input Filter Capacitor Discharge Circuitry
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● Eliminates the need for a X2 resistors
● Latch input for OVP and OTP implementations
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● Simple implementation of required protection functions
● Valley Switching Operation with Valley-Lockout
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● Improved efficiency with noise immunity
