Onsemi NCP1339

Description

The NCP1339 is a highly integrated quasi−resonant flyback ontroller capable of controlling rugged and high−performanceoff−line power supplies as required by adapter applications. With an ntegrated active X−cap discharge feature and power savings mode,the NCP1339 can enable no−load power consumption below 10 mW or 45 W notebook adapters.The quasi−resonant current−mode flyback stage features a roprietary valley−lockout circuitry, ensuring stable valley switching. his system works down to the 6th valley and toggles to a frequencyfoldback mode to eliminate switching losses. When the loop tends to orce below 25−kHz frequencies, the NCP1339 skips cycles to containthe power delivery.To help build rugged converters, the controller features several key rotective features: an internal brown−out, a non−dissipative Over ower Protection for a constant maximum output current regardless of he input voltage, a latched over−voltage protection through a dicated 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 orInductor 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−FreeOperation
• Frequency Fold−back for Highest Performance in Standby Mode
• 25−kHz Clamp and Skip Mode
• Timer−Based Overload Protection (Latched or Auto−RecoveryOptions)
• Adjustable Overpower Protection
• 4−ms Soft−Start Timer
• ZCD Blanking Time to Ignore Leakage Ringing atTurn−Off:3 s for C, D and E versions and 0.7 s for F, G or H versions
• These Devices are Pb−Free and are RoHS Compliant

Typical applications

• •Flat TV SMPS
• •Notebook Adapters
• •High Power Ac-Dc converters

More information

• Datasheet
• IC product information