onsemi | NCP1271D100R2G

The NCP1271 is a Soft-Skip Mode Standby PWM Controller with Adjustable Skip Level and External Latch.

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.

Key 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

Benefits:

• Efficient protective circuitry
• Provides improved efficiency at light loads and reduces the acoustic noise
• Clean and loss less start-up sequence and reduces component count

Applications:

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

To learn more about the NCP1271 product family, Click Here