Product Overview NCP1217A: PWM Controller, Fixed Frequency, Current Mode, with Duty Cycle Limited to 50% For complete documentation, see the data sheet Product Description Housed in a SOIC-7 or PDIP-7 package, the NCP1217 represents the second generation of NCP1203-based controllers. Thanks to its high drive capability, NCP1217 drives large gate-charge MOSFETs, which together with internal ramp compensation and built-in over voltage protection, ease the design of modern AC/DC adapters. NCP1217 offers a true alternative to UC384X-based designs. With an internal structure operating at different fixed frequencies (65, 100, 133kHz), the controller features a high-voltage start-up FET, which ensures a clean and loss less startup sequence. Its current-mode control topology provides an excellent input audiosusceptibility and inherent pulse-by-pulse control. Internal ramp compensation easily prevents subharmonic oscillations from taking place in continuous conduction mode designs. When the current setpoint falls below a given value, e.g. the output power demand diminishes, the IC automatically enters the socalled skip cycle mode and provides excellent efficiency at light loads. Because this occurs at a user adjustable low peak current, no acoustic noise takes place. The NCP1217 features two efficient protective circuitries: 1) in presence of an over-current condition, the output pulses are disabled and the device enters a safe burst mode, trying to re-start. Once the default has gone, the device auto-recovers. 2) if an external signal (e.g. a temperature sensor) pulls pin1 above 3.2V, output pulses are immediately stopped and the NCP1217 stays latched in this position. Reset occurs when the VCC collapses to ground, e.g. the user un-plugs the power supply. Features • • • • • • • • • • Current-Mode with adjustable skip-cycle capability Built-in internal ramp compensation Auto-recovery internal output short-circuit protection Full latch-off if Adjustment pin is brought high Extremely low no-load standby power Internal temperature shutdown 500mA peak current capability Fixed frequency versions at 65kHz, 100kHz and 133kHz Direct optocoupler connection Internal Leading Edge Blanking For more features, see the data sheet Applications • • • • High power AC/DC converters for TVs, set-top boxes etc Offline adapters for notebooks Telecom DC-DC converters All power supplies Part Electrical Specifications Product Compliance Status Topolog y Control Mode fsw Typ (kHz) StandUVLO by Mode (V) Short Circuit Protecti on Latch Soft Start VCC Max Drive (V) Cap. (mA) Packag e Type NCP1217AD100R2G Pb-free Active Flyback Current Mode 100 Yes Yes Yes Yes Yes 16 500 SOIC-8 Active Flyback Current Mode 133 Yes Yes Yes Yes Yes 16 500 SOIC-8 Active Flyback Current Mode 65 Yes Yes Yes Yes Yes 16 500 SOIC-8 Active Flyback Current Mode 100 Yes Yes Yes Yes Yes 16 500 PDIP-8 Active Flyback Current Mode 133 Yes Yes Yes Yes Yes 16 500 PDIP-8 Active Flyback Current Mode 65 Yes Yes Yes Yes Yes 16 500 PDIP-8 Halide free NCP1217AD133R2G Pb-free Halide free NCP1217AD65R2G Pb-free Halide free NCP1217AP100G Pb-free Halide free NCP1217AP133G Pb-free Halide free NCP1217AP65G Pb-free Halide free Application Diagram For more information please contact your local sales support at www.onsemi.com Created on: 6/30/2016