Catalog
High Voltage Switching Regulator for Offline SMPS
Key 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
Description
AI
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.
