NCP1027 High-Voltage Switcher for Medium Power Offline SMPS Featuring Low Standby Power The NCP1027 offers a new solution targeting output power levels www.onsemi.com from a few watts up to 15 W in a universal mains flyback application. Our proprietary highvoltage technology lets us include a power MARKING MOSFET together with a startup current source, all directly DIAGRAM connected to the bulk capacitor. To prevent lethal runaway in low input voltage conditions, an adjustable brownout circuitry blocks the activity until sufficient input level is reached. 8LEAD PDIP P1027Pxxx Currentmode operation together with an adjustable ramp P SUFFIX AWL compensation offers superior performance in universal mains CASE 626A YYWWG applications. Furthermore, an Over Power Protection pin brings the ability to precisely compensate all internal delays in high input voltage conditions and optimize the maximum output current capability. xxx = 65 or 100 A = Assembly Location Protection wise, a timer detects an overload or a shortcircuit and WL = Wafer Lot stops all operations, ensuring a safe autorecovery, low duty cycle burst YY = Year operation. An integrated, autorecovery, Overvoltage Protection WW = Work Week permanently monitors the V level and temporarily shuts down the CC G = PbFree Package driving pulses in case of an unexpected feedback loop runaway. Finally, a great R figure makes the circuit an excellent choice DS(on) for standby/auxiliary offline power supplies or applications requiring PIN CONNECTIONS higher output power levels. V CC GND Features Builtin 700 V MOSFET with Typical R of 5.8 , T = 25C Ramp Comp. OPP DS(on) J CurrentMode Fixed Frequency Operation: 65 kHz and 100 kHz BrownOut Fixed Peak Current of 800 mA FB Drain SkipCycle Operation at Low Peak Currents (Top View) Internal Current Source for Clean and Lossless Startup Sequence AutoRecovery Output Short Circuit Protection with TimerBased Detection ORDERING INFORMATION AutoRecovery Overvoltage Protection with Auxiliary Winding Device Package Shipping* Operation Programmable BrownOut Input for Low Input Voltage Detection NCP1027P065G PDIP8 50 Units / Rail (PbFree) Programmable Over Power Protection Input to Permanently Latchoff the Part NCP1027P100G PDIP8 50 Units / Rail (PbFree) Internal Frequency Jittering for Improved EMI Signature Extended Duty Cycle Operation to 80% Typical *For additional information on our PbFree strategy and soldering details, please download the NoLoad Input Standby Power of 85 mW 265 Vac ON Semiconductor Soldering and Mounting 500 mW Loaded, Input Power of 715 mW 230 Vac Techniques Reference Manual, SOLDERRM/D. These Devices are PbFree and are RoHS Compliant Typical Applications Medium Power ACDC Adapters for Chargers Auxiliary/Standby Power Supplies for ATX and TVS Power Supplies Reference 230 VAC 90265 VAC NCP1027 5.8 25 W* 15 W* *Typical values, openframe, 65 kHz version, R < 75C/W, T = 50C. JA A Semiconductor Components Industries, LLC, 2015 1 Publication Order Number: January, 2015 Rev. 5 NCP1027/DNCP1027 V out + OPP* NCP1027 OVP 1 8 + 2 7 85265 VAC BO 3 5 4 + + GND Ramp Comp.* *Optional component Figure 1. Typical Application PIN FUNCTION DESCRIPTION Pin No. Symbol Function Description 1 V Powers the Internal This pin is connected to an external capacitor of typically 22 F. The V CC CC Circuitry includes an active shunt which serves as an autorecovery overvoltage pro- tection. 2 Ramp Comp. Ramp Compensation To extend the duty cycle operation in Continuous Conduction Mode (CCM), in CCM pin 3 offers the ability to inject ramp compensation in the controller. If unused, short this pin to V . CC 3 BrownOut BrownOut and By monitoring the bulk level via a resistive network, the circuit protects itself Latchoff Input from low mains conditions. If an external event brings this pin above 4.0 V, the part fully latches off. 4 FB Feedback Signal Input By connecting an optocoupler to this pin, the peak current setpoint is adjusted accordingly to the output power demand. 5 Drain Drain Connection The internal drain power switch circuit connection. This unconnected pin ensures adequate creepage distance. 7 OPP Over Power Protection Driving this pin reduces the power supply capability in high line conditions. If no Over Power Protection is needed, short this pin to ground. 8 GND The IC Ground www.onsemi.com 2