NCP1027: High−Voltage Switcher for Medium Power Offline SMPS

Datasheet: High−Voltage Switcher for Medium Power Offline SMPS Featuring Low Standby Power Rev. 4 (637.0kB)

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The NCP1027 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, Overvoltage Protection permanently monitors the VCC level and temporarily shuts down the driving pulses in case of an unexpected feedback loop runaway.
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
Built-in 700 V MOSFET with Typical RDS(on) of 5.8 , Tj = 25C
Current-Mode Fixed Frequency Operation: 65 & 100 kHz
Fixed Peak Current of 800 mA
Proprietary Skip-Cycle Operation at Low Peak Currents
Internal Current Source for Clean and Lossless Startup Sequence
Auto-Recovery Output Short Circuit Protection with Timer-Based Detection
Auto-Recovery Overvoltage Protection with Auxiliary Winding Operation
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
500 mW Loaded, Input Power of 715 mW @ 230 Vac
Programmable Over Power Protection

Applications		End Products
Medium Power AC-DC Adapters for Chargers Auxiliary power supply Medium Power AC-DC power supply for CE apparatus		Mpeg3 players Flat Tvs: LCD and Plasma Deskop PC, Server DVD, Set Top Box

Technical Information
Design & Development Tools (2)	Simulation Models (2)
Reference Designs (5)	Selector Guides (1)
Design Notes (3)	Data Sheets (1)
Application Notes (8)	Package Drawings (1)