Product Overview NCP1028: High Voltage Switching Regulator for Offline SMPS For complete documentation, see the data sheet Product Description The NCP1028 offers a new solution targeting output power levels from a few watts up to 15W in a universal mains flyback application. Our proprietary high-voltage technology lets us include a power MOSFET together with a startup current source, all directly connected to the bulk capacitor. To prevent lethal runaway in low input voltage conditions, an adjustable brown-out circuitry blocks the activity until sufficient input level is reached. Current-mode operation together with an adjustable ramp compensation offers superior performance in universal mains applications. Protection wise, a timer detects an overload or a short-circuit and stops all operations, ensuring a safe auto-recovery, low duty cycle burst operation. An integrated, auto-recovery. Finally, a great RDS(on) figure makes the circuit an excellent choice for standby/auxiliary offline power supplies or applications requiring higher output power levels. Features Benefits • Skips cycles on low power demand • Provides improved efficiency at light loads No acoustic noise • Efficient protective circuitry Ease the design • Effect of the input voltage variation on the max power delivered is compensated • Short circuit protection independent of the AUX winding • Overpower protection • Built-in 700 V MOSFET with Typical RDS(on) of 5.8 , Tj = 25C • Fixed Peak Current of 800 mA • Internal Current Source for Clean and Lossless Startup Sequence • Programmable Brown-Out Input for Low Input Voltage Detection • Input to Permanently Latchoff the Part • Internal Frequency Jittering for Improved EMI Signature • No-Load Input Standby Power of 85 mW @ 265 Vac For more features, see the data sheet Applications End Products • Medium Power AC-DC Adapters for Chargers • Auxiliary power supply • Desktop PC • Flat TVs • DVD, STB Part Electrical Specifications Product Compliance Status Contr fsw fJitter ol Typ Typ Mode (kHz) (%) Stan RDS(O V(BR) DSS d-by N) Max Mode Typ (Ω) (V) IPeak (mA) HV DSS Start- (mA) up Min (V) UVL O Short Circu it Prote ction Over Brow Powe n-out r Com pens ation Latch Pack age Type NCP1028P065G Pb-free Active Curre 65 nt Mode Yes Yes 5.6 700 800 Yes N/A Yes Yes Yes Yes No PDIP -7 Active Curre 100 nt Mode Yes Yes 5.6 700 800 Yes N/A Yes Yes Yes Yes No PDIP -7 Halide free NCP1028P100G Pb-free Halide free Application Diagram For more information please contact your local sales support at www.onsemi.com Created on: 6/30/2016