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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 45 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

? High?voltage Current Source for Lossless Start?up Sequence

? X2 Capacitors Discharge Capability

? Power Savings Mode (PSM) for Extremely Low No?Load Power:

? Wide VCC Range from 10 V to 28 V

? Latching?off 28?V VCC Over?Voltage Protection

? Abnormal Overcurrent Fault Protection for Winding Short Circuit or Inductor Saturation Detection

? Integrated High?Voltage Startup Circuit with Brown?Out Detection

? Fault Input for Severe Fault Conditions, NTC Compatible for OTP

? Circuit Latching Off In Severe Fault Detection (OVP or OTP)

? Internal Temperature Shutdown

? Valley Switching Operation with Valley?Lockout for Noise?Free Operation

? Frequency Fold?back for Highest Performance in Standby Mode

? 25?kHz Clamp and Skip Mode

? Timer?Based Overload Protection (Latched or Auto?Recovery Options)

? Adjustable Overpower Protection

? 4?ms Soft?Start Timer

? ZCD Blanking Time to Ignore Leakage Ringing at Turn?Off:

3 us for C, D and E versions and 0.7 us for F, G, H, I and J versions

? Ready for High?Density QR design (F, G, H, I and J versions)

? These Devices are Pb?Free and are RoHS Compliant