Product Overview NCP1203: PWM Controller, Fixed Frequency, Flyback, Current Mode For complete documentation, see the data sheet Product Description Housed in SO-8 or DIP8 package, the NCP1203 represents a major leap toward ultra-compact Switch-Mode Power Supplies and represents an excellent candidate to replace the UC384X devices.Thanks to its proprietary SmartMOS Very High Voltage Technology, the circuit allows the implementation of complete off-line AC/DC adapters, battery charger and a high-power SMPS with few external components. With an internal structure operating at a fixed 40 kHz, 60 kHz or 100 kHz switching frequency, the controller features a high-voltage start-up FET which ensures a clean and loss-less start up sequence. Its current-mode control naturally provides good audio susceptibility and inherent pulse-by-pulse control. When the current set point falls below a given value, e.g. the output power demand diminishes, the IC automatically enters the socalled skip cycle mode and provides improved efficiency at light loads while offering excellent performance in standby conditions. Because this occurs at a user adjustable low peak current, no acoustic noise takes place. The NCP1203 also includes an efficient protective circuitry which, in presence of an output over load condition, disables the output pulses while the device enters a safe burst mode, trying to restart. Once the default has gone, the device auto-recovers. Finally, atemperature shutdown with hysteresis helps building safe and robust power supplies. Features • • • • • • • • • • High-Voltage Start Up Current Source Auto-Recovery Internal Output Short-Circuit Protection Extremely Low No-Load Standby Power Current-Mode with Adjustable Skip-Cycle Capability Internal Leading Edge Blanking 250 mA Peak Current Capability Internally Fixed Frequency at 40 kHz, 61 kHz and 100 kHz Direct Optocoupler Connection Undervoltage Lockout at 7.6 V Typical SPICE Models Available for TRANsient and AC Analysis For more features, see the data sheet Applications • AC/DC Adapters for Notebooks, etc. • Offline Battery Chargers • Auxiliary Power Supplies (USB, Appliances, TVs, etc.) 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 NCP1203D100R2G Pb-free Active Flyback Current Mode 100 Yes Yes Yes No No 16 250 SOIC-8 Active Flyback Current Mode 40 Yes Yes Yes No No 16 250 SOIC-8 Active Flyback Current Mode 60 Yes Yes Yes No No 16 250 SOIC-8 Active Flyback Current Mode 100 Yes Yes Yes No No 16 250 PDIP-8 Active Flyback Current Mode 40 Yes Yes Yes No No 16 250 PDIP-8 Active Flyback Current Mode 60 Yes Yes Yes No No 16 250 PDIP-8 Halide free NCP1203D40R2G Pb-free Halide free NCP1203D60R2G Pb-free Halide free NCP1203P100G Pb-free Halide free NCP1203P40G Pb-free Halide free NCP1203P60G Pb-free Halide free Application Diagram For more information please contact your local sales support at www.onsemi.com Created on: 6/30/2016