NCP1216 Datasheet

Current Mode PWM Controllers


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. NCP1216 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 NCP1216 Applications • High Power AC−DC Converters for TVs, Set−Top Boxes, etc.• Offline Adapters for Notebooks• Telecom DC−DC Converters• All Power Supplies


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