PWM Controller with Adjustable Skip Level and External Latch Input

The NCP1218 represents a new, pin to pin compatible, generation of the successful 7−pin current mode NCP12XX product series. The controller allows for excellent standby power consumption by use of its adjustable skip mode and integrated high voltage startup FET. Internal frequency jittering, ramp compensation, timer−based fault detection and a latch input make this controller an excellent candidate for converters where ruggedness and component cost are the key constraints.

FEATUREs
• Fixed−Frequency 65 kHz Current−Mode Operation with Ramp Compensation
• Dynamic Self Supply Eliminates the Need for an Auxiliary Winding
• Timer−Based Fault Protection for Improved Overload Detection
• Cycle Skip Reduces Input Power in Standby Mode
• Latched Overload Protection
• Internal High Voltage Startup Circuit
• Accurate Current Limit Detector (±5%)
• Adjustable Skip Level
• Latch Input for Easy Implementation of Overvoltage and Overtemperature Protection
• Frequency Modulation for Softened EMI Signature
• 500 mA/800 mA Peak Source/Sink Current Drive Capability
• Pin to Pin Compatible with the Existing NCP12XX Series
• These Devices are Pb−Free and Halogen Free/BFR Free*

Typical Applications
• AC−DC Adapters for Notebooks, LCD Monitors
• Offline Battery Chargers
• Consumer Electronic Appliances STB, DVD, DVDR