NCP1271

DATA SHEET www.onsemi.com Soft-Skipt Mode Standby PWM Controller with Adjustable Skip Level and External Latch NCP1271 The NCP1271 represents a new, pin to pin compatible, generation of the successful 7−pin current mode NCP12XX product series. The controller allows for excellent stand by power consumption by use of its adjustable Soft−Skip mode and integrated high voltage startup FET. This proprietary Soft−Skip also dramatically reduces the risk of acoustic noise. This allows the use of inexpensive transformers and capacitors in the clamping network. 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 Current−Mode Operation with Ramp Compensation and Skip Cycle in Standby Condition  Timer−Based Fault Protection for Improved Overload Detection  “Soft−Skip Mode” Technique for Optimal Noise Control in Standby  Internal High−Voltage Startup Current Source for Lossless Startup  "5% Current Limit Accuracy over the Full Temperature Range  Adjustable Skip Level  Internal Latch for Easy Implementation of Overvoltage and Overtemperature Protection  Frequency Jittering for Softened EMI Signature  +500 mA/−800 mA Peak Current Drive Capability  Sub−100 mW Standby Power can be Achieved  Pin−to−Pin Compatible with the Existing NCP120X Series  This is a Pb−Free Device Typical Applications  AC...