Offline Regulators | NCP1027
概览
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.
- Medium Power AC-DC Adapters for Chargers
- Medium Power AC-DC power supply for CE apparatus
- Auxiliary power supply
- Mpeg3 players
- Flat Tvs: LCD and Plasma
- Deskop PC, Server
- DVD, Set Top Box
- 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
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