PWM Current-Mode Controller for High-Power Universal Off-Line Supplies

Housed in a SOIC−8 or PDIP−7 package, the NCP1216 represents an enhanced version of NCP1200 based controllers. Due to its high drive capability, NCP1216 drives large gate−charge MOSFETs, which together with internal ramp compensation and built−in frequency jittering, ease the design of modern AC−DC adapters.
With an internal structure operating at different fixed frequencies, the controller supplies itself from the high−voltage rail, avoiding the need of an auxiliary winding. This feature naturally eases the designer task in some particular applications, e.g. battery chargers or TV sets. Current−mode control also provides an excellent input audio susceptibility and inherent pulse−by−pulse control. Internal ramp compensation easily prevents sub−harmonic oscillations from taking place in continuous conduction mode designs.

FEATUREs
• No Auxiliary Winding Operation
• Current−Mode Control with Adjustable Skip−Cycle Capability
• Internal Ramp Compensation
• Limited Duty Cycle to 50% (NCP1216A Only)
• Internal 1.0 ms Soft−Start (NCP1216A Only)
• Built−In Frequency Jittering for Better EMI Signature
• Auto−Recovery Internal Output Short−Circuit Protection
• Extremely Low No−Load Standby Power
• 500 mA Peak Current Capability
• Fixed Frequency Versions at 65 kHz, 100 kHz, 133 kHz
• Internal Temperature Shutdown
• Direct Optocoupler Connection
• SPICE Models Available for TRANsient and AC Analysis
• Pin−to−Pin Compatible with NCP1200 Series
• These are Pb−Free and Halide−Free Devices

Typical Applications
• High Power AC−DC Converters for TVs, Set−Top Boxes, etc.
• Offline Adapters for Notebooks
• Telecom DC−DC Converters
• All Power Supplies