Product Overview NCP1246: Controller, Fixed Frequency, Current Mode, for Flyback Converters For complete documentation, see the data sheet Product Description The NCP1246 is a new fixed-frequency current-mode controller featuring Dynamic Self-Supply. This function greatly simplifies the design of the auxiiary supply and the Vcc capacitor by activating the internal startup current source to supply the controller during start-up, transients, latch, stnad-by etc. This device contains a special HV detector which detects the application unplug from the AC input line and triggers the X2 discharge current. The HV structure also includes brown-out detection circuitry. The NCP1246 features a timer-based fault detection that ensures the detection of overload and an adjustable power compensation to help keep the maximum power independent of the input voltage. Due to frequency foldback, the controller exhibits excellent efficiency in light load condition while still achieving very low standby power consumption. Internal frequency jittering, ramp compensation, and a versatile latch input make this controller an excellent candidate for robust power supply designs. A dedicated off mode allows the SMPS to reach extremely low no load input power consumption when combinded with secondary side contoller NCP4353 or NCP4354. When used together, the SMPS is capable of achieving <10 mW no load input power consumption. The secondary side contoller signals the NCP1246 to enter a sleep mode, minimizing the power consumption of the control circuitry. This product is IEC60950 compliant. Please see the test report and certification in the Conformance report section below. Features • Frequency foldback and skip mode • Timer-based overload protection with latched (A version) or auto-recovery (B version) operation • High-voltage startup with dynamic self supply • Integrated brown-out detection • Frequency Modulation • Adjustable overpower protection • Latch off input Applications • AC-DC Adapters • LCD TV power supplies Benefits • Optimized efficiency across the entire load range • Protection against overcurrent and short circuit • • • • Simplifies the design of the auxiliary supply Protects against any drops in line voltage Softened EMI signature Automatically adjusts the current limit depending on the line input voltage (high line or low line) • Protection against faults End Products • Notebook Computers 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 NCP1246AD065R2G Pb-free Active Flyback Current Mode 65 Yes 8.9 Yes Yes Yes 28 500 / 800 SOIC-7 Active Flyback Current Mode 100 Yes 8.9 Yes Yes Yes 28 500 / 800 SOIC-7 Active Flyback Current Mode 65 Yes 8.9 Yes Yes Yes 28 500 / 800 SOIC-7 Active Flyback Current Mode 100 Yes 8.9 Yes Yes Yes 28 500 / 800 SOIC-7 Active Flyback Current Mode 65 Yes 8.9 Yes Yes Yes 28 500 / 800 SOIC-7 Active Flyback Current Mode 100 Yes 8.9 Yes Yes Yes 28 500 / 800 SOIC-7 Active Flyback Current Mode 65 Yes 8.9 Yes Yes Yes 28 500 / 800 SOIC-7 Active Flyback Current Mode 100 Yes 8.9 Yes Yes Yes 28 500 / 800 SOIC-7 Halide free NCP1246AD100R2G Pb-free Halide free NCP1246ALD065R2G Pb-free Halide free NCP1246ALD100R2G Pb-free Halide free NCP1246BD065R2G Pb-free Halide free NCP1246BD100R2G Pb-free Halide free NCP1246BLD065R2G Pb-free Halide free NCP1246BLD100R2G Pb-free Halide free Application Diagram For more information please contact your local sales support at www.onsemi.com Created on: 6/30/2016